Pub Date : 2023-11-01DOI: 10.1177/08927057231211220
Hoai Nam Vu, Thi Kieu My Do, Minh Duc Vu, Le Ngoc Ly, Nguyen Thi Giang, Nguyen Thi Phuong
An analytical approach for nonlinear buckling and postbuckling responses of corrugated-core toroidal shell segments with carbon nanotube (CNT) reinforced face sheets in thermal environment subjected to radial pressure is reported in this work. Three distribution laws of functionally graded CNT-reinforced layers and the trapezoidal and round forms of the corrugated core are investigated. An equivalent technique for corrugated panels is improved by adding thermal forces to model the behavior of the corrugated core. The nonlinear equations are formulated by using the geometrically nonlinear Donnell shell theory considering Pasternak’s foundation. An algorithm to solve a system of nonlinear equations is established using the Ritz energy method with three shell deflection amplitudes. The postbuckling expressions between the compressive and tensile loads with maximal deflection and the critical compressive and tensile loads are determined. The numerically investigated examples present the significantly beneficial effects of corrugated core and functionally graded CNT-reinforced face sheets on nonlinear buckling responses of structures.
{"title":"Nonlinear thermo-elastic stability of corrugated-core toroidal shell segments with carbon nanotube-reinforced face sheets under radial pressure","authors":"Hoai Nam Vu, Thi Kieu My Do, Minh Duc Vu, Le Ngoc Ly, Nguyen Thi Giang, Nguyen Thi Phuong","doi":"10.1177/08927057231211220","DOIUrl":"https://doi.org/10.1177/08927057231211220","url":null,"abstract":"An analytical approach for nonlinear buckling and postbuckling responses of corrugated-core toroidal shell segments with carbon nanotube (CNT) reinforced face sheets in thermal environment subjected to radial pressure is reported in this work. Three distribution laws of functionally graded CNT-reinforced layers and the trapezoidal and round forms of the corrugated core are investigated. An equivalent technique for corrugated panels is improved by adding thermal forces to model the behavior of the corrugated core. The nonlinear equations are formulated by using the geometrically nonlinear Donnell shell theory considering Pasternak’s foundation. An algorithm to solve a system of nonlinear equations is established using the Ritz energy method with three shell deflection amplitudes. The postbuckling expressions between the compressive and tensile loads with maximal deflection and the critical compressive and tensile loads are determined. The numerically investigated examples present the significantly beneficial effects of corrugated core and functionally graded CNT-reinforced face sheets on nonlinear buckling responses of structures.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"38 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135271058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01Epub Date: 2023-08-28DOI: 10.3114/fuse.2023.12.07
N Kobmoo, K Tasanathai, J P M Araújo, W Noisripoom, B Thanakitpipattana, S Mongkolsamrit, W Himaman, J Houbraken, J J Luangsa-Ard
Four new species of the genus Niveomyces are described from Thailand. They were found as mycoparasites on: Ophiocordyceps infecting flies (Diptera) for Niveomyces albus; ants (Hymenoptera) for N. formicidarum; and leafhoppers (Hemiptera) for N. hirsutellae and N. multisynnematus. A new genus, Pseudoniveomyces with two species: Pseudoniveo. blattae (type species), parasitic on Ophiocordyceps infecting cockroaches, and Pseudoniveo. arachnovorum, found on a spider egg sac, are also described. These fungi share a common feature which is a sporothrix-like asexual morph. Based on our molecular data, Sporothrix insectorum is shown to be affiliated to the genus Niveomyces, and thus a new combination N. insectorum comb. nov. is proposed. Niveomyces coronatus, N. formicidarum and N. insectorum formed the N. coronatus species complex found on ant-pathogenic Ophiocordyceps from different continents. Pseudoniveomyces species are distinguished from Niveomyces spp. based on the presence of fusoid macroconidia in culture and a red pigment diffused in the medium, resembling to Gibellula and Hevansia. The molecular phylogenetic analyses also confirmed its generic status. The host/substrates associated with the genera within Cordycipitaceae were mapped onto the phylogeny to demonstrate that mycoparasitism also evolved independently multiple times in this family. Citation: Kobmoo N, Tasanathai K, Araújo JPM, Noisripoom W, Thanakitpipattana D, Mongkolsamrit S, Himaman W, Houbraken J, Luangsa-ard JJ (2023). New mycoparasitic species in the genera Niveomyces and Pseudoniveomyces gen. nov. (Hypocreales: Cordycipitaceae), with sporothrix-like asexual morphs, from Thailand. Fungal Systematics and Evolution12: 91-110. doi: 10.3114/fuse.2023.12.07.
本报告描述了来自泰国的四种牛肝菌属新物种。它们是作为霉菌寄生虫被发现的：蚁（膜翅目）上；以及叶蝉（半翅目）上的 N. hirsutellae 和 N. multisynnematus。新属假酵母菌（Pseudoniveomyces）有两个种：blattae（模式种）和 Pseudoniveo.这些真菌有一个共同的特征，即孢子丝状无性形态。根据我们的分子数据，Sporothrix insectorum 被证明隶属于果蝇属，因此提出了一个新的组合 N. insectorum comb.N. coronatus、N. formicidarum 和 N. insectorum 构成了在不同大陆的抗病虫草上发现的 N. coronatus 种群。假丝酵母菌与子酵母菌的区别在于培养基中存在纺锤形大锥体和红色色素，类似于 Gibellula 和 Hevansia。分子系统学分析也证实了它的属种地位。与虫草科属相关的寄主/基质被映射到系统发育上，以证明在该科中霉菌寄生也是多次独立进化的。引用：Kobmoo N, Tasanathai K, Araújo JPM, Noisripoom W, Thanakitpipattana D, Mongkolsamrit S, Himaman W, Houbraken J, Luangsa-ard JJ (2023).来自泰国的新霉菌属（Hypocreales: Cordycipitaceae）Niveomyces 和 Pseudoniveomyces gen.Fungal Systematics and Evolution 12: 91-110. doi: 10.3114/fuse.2023.12.07.
{"title":"New mycoparasitic species in the genera <i>Niveomyces</i> and <i>Pseudoniveomyces</i><i>gen. nov</i>. (<i>Hypocreales</i>: <i>Cordycipitaceae</i>), with sporothrix-like asexual morphs, from Thailand.","authors":"N Kobmoo, K Tasanathai, J P M Araújo, W Noisripoom, B Thanakitpipattana, S Mongkolsamrit, W Himaman, J Houbraken, J J Luangsa-Ard","doi":"10.3114/fuse.2023.12.07","DOIUrl":"10.3114/fuse.2023.12.07","url":null,"abstract":"<p><p><b></b> Four new species of the genus <i>Niveomyces</i> are described from Thailand. They were found as mycoparasites on: <i>Ophiocordyceps</i> infecting flies (<i>Diptera</i>) for <i>Niveomyces albus</i>; ants (<i>Hymenoptera</i>) for <i>N. formicidarum</i>; and leafhoppers (<i>Hemiptera</i>) for <i>N. hirsutellae</i> and <i>N. multisynnematus</i>. A new genus, <i>Pseudoniveomyces</i> with two species: <i>Pseudoniveo. blattae</i> (type species), parasitic on <i>Ophiocordyceps</i> infecting cockroaches, and <i>Pseudoniveo. arachnovorum</i>, found on a spider egg sac, are also described. These fungi share a common feature which is a sporothrix-like asexual morph. Based on our molecular data, <i>Sporothrix insectorum</i> is shown to be affiliated to the genus <i>Niveomyces</i>, and thus a new combination <i>N. insectorum comb. nov</i>. is proposed. <i>Niveomyces coronatus</i>, <i>N. formicidarum</i> and <i>N. insectorum</i> formed the <i>N. coronatus</i> species complex found on ant-pathogenic <i>Ophiocordyceps</i> from different continents. <i>Pseudoniveomyces</i> species are distinguished from <i>Niveomyces</i> spp. based on the presence of fusoid macroconidia in culture and a red pigment diffused in the medium, resembling to <i>Gibellula</i> and <i>Hevansia</i>. The molecular phylogenetic analyses also confirmed its generic status. The host/substrates associated with the genera within <i>Cordycipitaceae</i> were mapped onto the phylogeny to demonstrate that mycoparasitism also evolved independently multiple times in this family. <b>Citation:</b> Kobmoo N, Tasanathai K, Araújo JPM, Noisripoom W, Thanakitpipattana D, Mongkolsamrit S, Himaman W, Houbraken J, Luangsa-ard JJ (2023). New mycoparasitic species in the genera <i>Niveomyces</i> and <i>Pseudoniveomyces gen. nov</i>. (<i>Hypocreales</i>: <i>Cordycipitaceae</i>), with sporothrix-like asexual morphs, from Thailand. <i>Fungal Systematics and Evolution</i> <b>12</b>: 91-110. doi: 10.3114/fuse.2023.12.07.</p>","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"35 1","pages":"91-110"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10964586/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73155226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-31DOI: 10.1177/08927057221109153
Ahmet İpekçi, Bülent Ekici
Filament winding method is the most commonly used method to produce profiles with different cross sections as composite product manufacturing. In this method, fiber material is wound with resin at different angles on a mold that has a suitable cross section shape. As a winding strategy, angled and helical winding can be done. Motion planning for this process is done with geodesic and nongeodesic theories. Requirement to use mold in the filament winding method increases the cost. Also, there is an obligation to helical windings. In winding of different layers, 90° angle cannot be given between the layers. To overcome all these constraints, UV curing can be achieved using photopolymer resin and continuous fiber glass fiber with the help of robotic additive manufacturing technology. Toolpath strategies for production has a key role in this work. As a tool path strategy, nonplanar slicing can be done and manufactured composite elbow in angular layers without mold. Then, under favour of 6-axis mobility of the industrial robot arm, layers can be obtained at exactly 90° angle. In addition, in this method, unlike other winding methods, internal voids, i.e. a filling rate, can be given within the cylindrical encircled layers. In order to verify whether the elbows produced with this method meet the requirements of the desired applications in the industry in terms of mechanical properties, at different filling rates (50%, 75%, 100%), winding turns (0 and 1/8), and different fiber densities (45%, 55% and 65%) 90° curved composite elbows were produced and their internal pressure strength tests were tested. Afterwards, an optimization study was carried out with the Taguchi method for the production parameters that will maximize the internal pressure strength. According to the results of the optimization study, it is seen that it is appropriate to choose the printing parameters that will obtain the highest internal pressure strength values for production with this method, 100% fill rate, 65% fiber density and 0° winding angle. The products made of this process have the advantage of easy-shaping, reasonable ratio of axial strength and encircled strength, specification easy-unifying, stable product quality.
{"title":"An innovative composite elbow manufacturing method with 6-axis robotic additive manufacturing for fabrication of complex composite structures","authors":"Ahmet İpekçi, Bülent Ekici","doi":"10.1177/08927057221109153","DOIUrl":"https://doi.org/10.1177/08927057221109153","url":null,"abstract":"Filament winding method is the most commonly used method to produce profiles with different cross sections as composite product manufacturing. In this method, fiber material is wound with resin at different angles on a mold that has a suitable cross section shape. As a winding strategy, angled and helical winding can be done. Motion planning for this process is done with geodesic and nongeodesic theories. Requirement to use mold in the filament winding method increases the cost. Also, there is an obligation to helical windings. In winding of different layers, 90° angle cannot be given between the layers. To overcome all these constraints, UV curing can be achieved using photopolymer resin and continuous fiber glass fiber with the help of robotic additive manufacturing technology. Toolpath strategies for production has a key role in this work. As a tool path strategy, nonplanar slicing can be done and manufactured composite elbow in angular layers without mold. Then, under favour of 6-axis mobility of the industrial robot arm, layers can be obtained at exactly 90° angle. In addition, in this method, unlike other winding methods, internal voids, i.e. a filling rate, can be given within the cylindrical encircled layers. In order to verify whether the elbows produced with this method meet the requirements of the desired applications in the industry in terms of mechanical properties, at different filling rates (50%, 75%, 100%), winding turns (0 and 1/8), and different fiber densities (45%, 55% and 65%) 90° curved composite elbows were produced and their internal pressure strength tests were tested. Afterwards, an optimization study was carried out with the Taguchi method for the production parameters that will maximize the internal pressure strength. According to the results of the optimization study, it is seen that it is appropriate to choose the printing parameters that will obtain the highest internal pressure strength values for production with this method, 100% fill rate, 65% fiber density and 0° winding angle. The products made of this process have the advantage of easy-shaping, reasonable ratio of axial strength and encircled strength, specification easy-unifying, stable product quality.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"131 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135927885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-30DOI: 10.1177/08927057231211236
Mohamed El-Sakhawy, Hebat-Allah S. Tohamy, Mona M. AbdelMohsen, Mostafa El-Missiry
This work goal is to develop a valuable biodegradable material for sustainable packaging. The utilization of agriculture wastes to produce biodegradable packaging films based on carboxymethyl cellulose (CMC) will reduce its price. CMC was prepared from sugar cane bagasse, and used to prepare composite films with mandarin and cantaloupe peels extracts of different ratios. The effects of these extracts on the mechanical and antimicrobial properties of the prepared films were evaluated. Thus, the films incorporated with 10% concentration of mandarin and cantaloupe peels extract exhibited excellent antimicrobial properties against gram positive, gram negative bacteria and pathogenic yeast than the other lower concentrated films. The physiochemical properties of each developed biodegradable films were characterized using Fourier Transform Infra-Red (FTIR) spectroscopy, X-Ray diffraction analysis (XRD), Scanning Electron Microscopy (SEM) and antimicrobial. The reflected work is a novel approach, and which is vital in the conversion of organic waste to value-added product development.
{"title":"Biodegradable carboxymethyl cellulose based material for sustainable/active food packaging application","authors":"Mohamed El-Sakhawy, Hebat-Allah S. Tohamy, Mona M. AbdelMohsen, Mostafa El-Missiry","doi":"10.1177/08927057231211236","DOIUrl":"https://doi.org/10.1177/08927057231211236","url":null,"abstract":"This work goal is to develop a valuable biodegradable material for sustainable packaging. The utilization of agriculture wastes to produce biodegradable packaging films based on carboxymethyl cellulose (CMC) will reduce its price. CMC was prepared from sugar cane bagasse, and used to prepare composite films with mandarin and cantaloupe peels extracts of different ratios. The effects of these extracts on the mechanical and antimicrobial properties of the prepared films were evaluated. Thus, the films incorporated with 10% concentration of mandarin and cantaloupe peels extract exhibited excellent antimicrobial properties against gram positive, gram negative bacteria and pathogenic yeast than the other lower concentrated films. The physiochemical properties of each developed biodegradable films were characterized using Fourier Transform Infra-Red (FTIR) spectroscopy, X-Ray diffraction analysis (XRD), Scanning Electron Microscopy (SEM) and antimicrobial. The reflected work is a novel approach, and which is vital in the conversion of organic waste to value-added product development.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"57 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136103849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-30DOI: 10.1177/08927057231211237
Aksam Abdelkhalik, Ghada Makhlouf, Tarek M. El-Basheer
Polyvinyl alcohol (PVA) is a highly flammable material, and enhancing its flame retardancy to pass the glow wire test is a great challenge. In this work, the melamine salt of tannic phosphate (MTP) was synthesized, characterized, and combined with PVA at 8, 10, 13, and 15 wt%. The thermogravimetric analysis (TGA) results indicated that MTP enhanced the char formation of PVA at 750°C. Flammability tests showed that low concentrations of MTP can enhance the flame retardancy of PVA. The limiting oxygen index (LOI) of PVA increased from 18.8% to 39.9% in the PVA/15%MTP composite. The vertical flame spread test (UL94V) showed that PVA/13%MTP, and PVA/15%MTP composites achieved V0 rating. Glow wire test data indicated that PVA/10%MTP, PVA/13%MTP, and PVA/15%MTP composites had a glow wire flammability index (GWFI) of 960°C/2 mm. Moreover, all the composites passed the needle flame test when the flame application time was 120 s. PVA/15%MTP composite showed very good UV protection and an increase in sound absorption coefficient magnitude compared with pure PVA. The new results can increase the application of PVA in different industries.
{"title":"Reducing fire hazards and enhancing the thermal stability, acoustical, and UV protection of polyvinyl alcohol using bio-based flame retardant","authors":"Aksam Abdelkhalik, Ghada Makhlouf, Tarek M. El-Basheer","doi":"10.1177/08927057231211237","DOIUrl":"https://doi.org/10.1177/08927057231211237","url":null,"abstract":"Polyvinyl alcohol (PVA) is a highly flammable material, and enhancing its flame retardancy to pass the glow wire test is a great challenge. In this work, the melamine salt of tannic phosphate (MTP) was synthesized, characterized, and combined with PVA at 8, 10, 13, and 15 wt%. The thermogravimetric analysis (TGA) results indicated that MTP enhanced the char formation of PVA at 750°C. Flammability tests showed that low concentrations of MTP can enhance the flame retardancy of PVA. The limiting oxygen index (LOI) of PVA increased from 18.8% to 39.9% in the PVA/15%MTP composite. The vertical flame spread test (UL94V) showed that PVA/13%MTP, and PVA/15%MTP composites achieved V0 rating. Glow wire test data indicated that PVA/10%MTP, PVA/13%MTP, and PVA/15%MTP composites had a glow wire flammability index (GWFI) of 960°C/2 mm. Moreover, all the composites passed the needle flame test when the flame application time was 120 s. PVA/15%MTP composite showed very good UV protection and an increase in sound absorption coefficient magnitude compared with pure PVA. The new results can increase the application of PVA in different industries.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"441 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136068500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-29DOI: 10.1177/08927057231211218
Hailong Chen, Nan Chen, Qingqing Ma, Yan He
Carbon nanotubes (CNTs-), graphene (GNs)-natural rubber (NR) composites were prepared by wet mixing process and dry mixing process, respectively. Thermal conductivity, 300% tensile stress, tear strength and elongation at break of the samples were measured experimentally. The effects of mixing process, carbon materials content and type on thermal properties and mechanical properties of composites were studied. The experimental results show that, the thermal conductivity of the mixed rubber, the 300% tensile stress and the tear strength of the vulcanizate all increase first and then decrease slightly with the increase of the carbon material content, regardless of the mixing process. However, the elongation at break of vulcanizate showed an opposite trend. When the carbon material content is 2.0% (w.t.%), thermal conductivity, 300% tensile stress and tear strength all reach their maximum, while elongation at break obtains minimum. Under the same amount of addition, GNs is more conducive to improving the thermal conductivity and elongation at break of composites, while CNTs are more conducive to improving the tensile strength and tear strength of composites. For CNTs-, GNs-NR composites, the wet mixing process can greatly improve the thermal conductivity, tensile strength and tear strength of composites, while the dry mixing process can greatly improve the elongation at break of composites. Therefore, when preparing CNTs-, GNs-NR composites, it is necessary to select a suitable mixing process according to the performance requirements of the final product.
{"title":"Experimental study on preparation and properties of carbon nanotubes-, graphene –natural rubber composites","authors":"Hailong Chen, Nan Chen, Qingqing Ma, Yan He","doi":"10.1177/08927057231211218","DOIUrl":"https://doi.org/10.1177/08927057231211218","url":null,"abstract":"Carbon nanotubes (CNTs-), graphene (GNs)-natural rubber (NR) composites were prepared by wet mixing process and dry mixing process, respectively. Thermal conductivity, 300% tensile stress, tear strength and elongation at break of the samples were measured experimentally. The effects of mixing process, carbon materials content and type on thermal properties and mechanical properties of composites were studied. The experimental results show that, the thermal conductivity of the mixed rubber, the 300% tensile stress and the tear strength of the vulcanizate all increase first and then decrease slightly with the increase of the carbon material content, regardless of the mixing process. However, the elongation at break of vulcanizate showed an opposite trend. When the carbon material content is 2.0% (w.t.%), thermal conductivity, 300% tensile stress and tear strength all reach their maximum, while elongation at break obtains minimum. Under the same amount of addition, GNs is more conducive to improving the thermal conductivity and elongation at break of composites, while CNTs are more conducive to improving the tensile strength and tear strength of composites. For CNTs-, GNs-NR composites, the wet mixing process can greatly improve the thermal conductivity, tensile strength and tear strength of composites, while the dry mixing process can greatly improve the elongation at break of composites. Therefore, when preparing CNTs-, GNs-NR composites, it is necessary to select a suitable mixing process according to the performance requirements of the final product.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"59 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136135849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-28DOI: 10.1177/08927057231211481
Anuj Singh, Aswathy N R, Aswini Kumar Mohapatra
In recent years, researchers and scholars have shown growing interest in exploring the applications of natural fibers in polymer composites, driven by their environmentally friendly and sustainable characteristics. This study endeavors to offer an exhaustive examination of the prominent and widely adopted natural fiber reinforced polymer composites and their diverse range of applications. Furthermore, it provides an overview of different surface treatment methods applied to natural fibers and their influence on the properties of, highlighting the significant variations in properties depending on the fiber type, source, and structure. Bamboo fibers (BF) and recycled chemically functionalized acrylonitrile-butadiene-styrene (r-ABS) composites (BF/rABS) have been blended at 190°C. The composites show a higher tensile and flexural properties than r-ABS. The presence of bamboo fibers functions as stress concentrators, resulting in minimized deformation and consequently reducing the impact strength of the composites in comparison to the matrix. The SEM and FTIR analysis have shown that the adhesion between fiber and the matrix is good which therefore improves the tensile properties of the composite materials. XRD analysis has shown improved crystallinity in composite as compared to matrix.
{"title":"Enhancing the fiber-matrix interface of r-ABS and bamboo fiber composite developed through melt compounding: An analysis of mechanical and morphological","authors":"Anuj Singh, Aswathy N R, Aswini Kumar Mohapatra","doi":"10.1177/08927057231211481","DOIUrl":"https://doi.org/10.1177/08927057231211481","url":null,"abstract":"In recent years, researchers and scholars have shown growing interest in exploring the applications of natural fibers in polymer composites, driven by their environmentally friendly and sustainable characteristics. This study endeavors to offer an exhaustive examination of the prominent and widely adopted natural fiber reinforced polymer composites and their diverse range of applications. Furthermore, it provides an overview of different surface treatment methods applied to natural fibers and their influence on the properties of, highlighting the significant variations in properties depending on the fiber type, source, and structure. Bamboo fibers (BF) and recycled chemically functionalized acrylonitrile-butadiene-styrene (r-ABS) composites (BF/rABS) have been blended at 190°C. The composites show a higher tensile and flexural properties than r-ABS. The presence of bamboo fibers functions as stress concentrators, resulting in minimized deformation and consequently reducing the impact strength of the composites in comparison to the matrix. The SEM and FTIR analysis have shown that the adhesion between fiber and the matrix is good which therefore improves the tensile properties of the composite materials. XRD analysis has shown improved crystallinity in composite as compared to matrix.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136160274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-28DOI: 10.1177/08927057231211221
Minhaz Husain, Rupinder Singh, BS Pabla
In the last two decades, several studies have been conducted for the process parametric optimization of fused filament fabrication (FFF) with a variety of thermoplastic composites, especially for mechanical properties. But hitherto less has been conveyed, on the development of dynamic reduced order models (ROMs) for digital twining (DT) of tensile properties (of 3D printed implants/scaffolds) with novel thermoplastic-based composites. In this study, for the generation of dynamic ROM (for hybrid analytics), the signal-to-noise (S/N) ratio was used to ascertain the best settings of parameters for tensile properties of polyvinylidene fluoride (PVDF) composite. The study suggests that the best setting of the FFF process, for the 3D printing of PVDF composite (90% PVDF, 8% hydroxyapatite (HAp), and 2% Chitosan (CS) (for maximizing the tensile properties as per ASTM-D638-Type-V) are nozzle temperature (NT) of 235°C, raster angle (RA) 45°, printing speed (PS) of 60 mm/s respectively resulting in peak load (PL) 394.87 N, peak stress (PSt) 33.92 MPa, Young’s modulus (E) 2.606 MPa. For a modulus of toughness (MOT) of 0.484 MPa, the best settings are NT 230°C, RA 90°, and PS 50 mm/s. The results are supported by the morphological analysis.
{"title":"On digital twinning of fused filament fabrication for tensile properties of polyvinylidene fluoride composites-based functional prototypes","authors":"Minhaz Husain, Rupinder Singh, BS Pabla","doi":"10.1177/08927057231211221","DOIUrl":"https://doi.org/10.1177/08927057231211221","url":null,"abstract":"In the last two decades, several studies have been conducted for the process parametric optimization of fused filament fabrication (FFF) with a variety of thermoplastic composites, especially for mechanical properties. But hitherto less has been conveyed, on the development of dynamic reduced order models (ROMs) for digital twining (DT) of tensile properties (of 3D printed implants/scaffolds) with novel thermoplastic-based composites. In this study, for the generation of dynamic ROM (for hybrid analytics), the signal-to-noise (S/N) ratio was used to ascertain the best settings of parameters for tensile properties of polyvinylidene fluoride (PVDF) composite. The study suggests that the best setting of the FFF process, for the 3D printing of PVDF composite (90% PVDF, 8% hydroxyapatite (HAp), and 2% Chitosan (CS) (for maximizing the tensile properties as per ASTM-D638-Type-V) are nozzle temperature (NT) of 235°C, raster angle (RA) 45°, printing speed (PS) of 60 mm/s respectively resulting in peak load (PL) 394.87 N, peak stress (PSt) 33.92 MPa, Young’s modulus (E) 2.606 MPa. For a modulus of toughness (MOT) of 0.484 MPa, the best settings are NT 230°C, RA 90°, and PS 50 mm/s. The results are supported by the morphological analysis.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"84 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136233486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-27DOI: 10.1177/08927057231208138
Aluisie Picolotto, Lilian Vanessa Rossa Beltrami, Danielli Dallé, Heitor Luiz Ornaghi Júnior, Ademir José Zattera, Andre Luis Catto, Cleide Borsoi
Biodegradable starch-based films are an environmentally friendly solution to reduce the use of petroleum-derived polymers. Thus, this work aims to obtain corn starch films by incorporating 5% w/w of cellulose nanocrystals (CNC), different concentrations of titanium dioxide nanoparticles (TiO 2 ) (0, 0.25, 0.5, 1, and 2% w/w), and 40% w/w of glycerol and sorbitol (plasticizers), in a 1:1 ratio. The films showed a high potential for UV-light barrier, with an increase of 307% incorporating only 2 wt% of TiO 2 in relation to the film without incorporation of TiO 2 . The use of TiO 2 increased the white pigmentation capacity of the samples and decreased the lower water solubility – a reduction of approximately 28% using 0.5 wt% TiO 2 compared to the CNC control sample was observed. The incorporation of TiO 2 nanoparticles increased the tensile strength by adding 1 wt% of TiO 2 nanoparticles with 34% increase in the tensile strength of the film without incorporation of TiO 2 . The thermal stability of the films with 1 wt% TiO 2 and 5 wt% CNC increased by 85°C. Thus, the addition of CNC and TiO 2 enabled an improvement in the physical/thermal/chemical properties of the films, making them possible alternatives for use in food packaging.
{"title":"Development and evaluation of biodegradable starch-based films containing cellulose nanocrystals/titanium dioxide nanoparticles as an alternative for food packaging","authors":"Aluisie Picolotto, Lilian Vanessa Rossa Beltrami, Danielli Dallé, Heitor Luiz Ornaghi Júnior, Ademir José Zattera, Andre Luis Catto, Cleide Borsoi","doi":"10.1177/08927057231208138","DOIUrl":"https://doi.org/10.1177/08927057231208138","url":null,"abstract":"Biodegradable starch-based films are an environmentally friendly solution to reduce the use of petroleum-derived polymers. Thus, this work aims to obtain corn starch films by incorporating 5% w/w of cellulose nanocrystals (CNC), different concentrations of titanium dioxide nanoparticles (TiO 2 ) (0, 0.25, 0.5, 1, and 2% w/w), and 40% w/w of glycerol and sorbitol (plasticizers), in a 1:1 ratio. The films showed a high potential for UV-light barrier, with an increase of 307% incorporating only 2 wt% of TiO 2 in relation to the film without incorporation of TiO 2 . The use of TiO 2 increased the white pigmentation capacity of the samples and decreased the lower water solubility – a reduction of approximately 28% using 0.5 wt% TiO 2 compared to the CNC control sample was observed. The incorporation of TiO 2 nanoparticles increased the tensile strength by adding 1 wt% of TiO 2 nanoparticles with 34% increase in the tensile strength of the film without incorporation of TiO 2 . The thermal stability of the films with 1 wt% TiO 2 and 5 wt% CNC increased by 85°C. Thus, the addition of CNC and TiO 2 enabled an improvement in the physical/thermal/chemical properties of the films, making them possible alternatives for use in food packaging.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"25 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136316946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The copolymer precursor, poly [4-(4-vinylbenzyl)oxy)phthalonitrile]-co-methyl methacrylate (poly (VBOPN-co-MMA)), was synthesized through copolymerization of VBOPN and MMA at a temperature of 110°C. Subsequently, a single-chain polymer complex of cobalt phthalocyanine (SCP-CoPc) was formed at 150°C by intramolecular macrocyclization between the cobalt and the phthalonitrile group in poly (VBOPN-co-MMA), using excess cyclohexanol. The formation of the SCP-CoPc complex was confirmed through various spectroscopic techniques such as UV/Vis, FT-IR, 1 H-NMR, and 13 C-NMR. In particular, the disappearance of -CN band at 2232 cm −1 from FT-IR indicated the formation of the SCP-CoPc complex, while the presence of specific absorption bands in the UV/Vis spectrum further confirmed its creation. The electrical, dielectric, optical, and thermal properties of the SCP-CoPc complex and SCP-CoPc/ZnO 5% composites were investigated. The SCP-CoPc/ZnO 5 wt% nanocomposite exhibited improved dielectric and DC conductivity with increasing temperature. The activation energy (Ea) was found to be 0.35 eV for SCP-CoPc and 0.25 eV for SCP-CoPc/ZnO 5 wt% nanocomposite, indicating that the electrical conductivity followed the Arrhenius equation. The optical properties, including band gap, dielectric constant, and refractive index, were calculated for the SCP-CoPc/ZnO 5 wt% nanocomposite. The SCP-CoPc complex possessed a band gap of 2.89 eV, while the SCP-CoPc/ZnO 5 wt% nanocomposite had a slightly reduced band gap of 2.36 eV. The refractive indices of SCP-CoPc and SCP-CoPc/ZnO 5 wt% were also determined.
{"title":"Cobalt atom collapsed in a single chain of polymethyl methacrylate and its zinc oxide nanocomposite, thermal, electrical, and optical behaviors","authors":"Osama Ismail Haji Zebari, Kadir Demirelli, Samie Yaseen Sharaf Zeebaree, Hülya Tuncer","doi":"10.1177/08927057231205454","DOIUrl":"https://doi.org/10.1177/08927057231205454","url":null,"abstract":"The copolymer precursor, poly [4-(4-vinylbenzyl)oxy)phthalonitrile]-co-methyl methacrylate (poly (VBOPN-co-MMA)), was synthesized through copolymerization of VBOPN and MMA at a temperature of 110°C. Subsequently, a single-chain polymer complex of cobalt phthalocyanine (SCP-CoPc) was formed at 150°C by intramolecular macrocyclization between the cobalt and the phthalonitrile group in poly (VBOPN-co-MMA), using excess cyclohexanol. The formation of the SCP-CoPc complex was confirmed through various spectroscopic techniques such as UV/Vis, FT-IR, 1 H-NMR, and 13 C-NMR. In particular, the disappearance of -CN band at 2232 cm −1 from FT-IR indicated the formation of the SCP-CoPc complex, while the presence of specific absorption bands in the UV/Vis spectrum further confirmed its creation. The electrical, dielectric, optical, and thermal properties of the SCP-CoPc complex and SCP-CoPc/ZnO 5% composites were investigated. The SCP-CoPc/ZnO 5 wt% nanocomposite exhibited improved dielectric and DC conductivity with increasing temperature. The activation energy (Ea) was found to be 0.35 eV for SCP-CoPc and 0.25 eV for SCP-CoPc/ZnO 5 wt% nanocomposite, indicating that the electrical conductivity followed the Arrhenius equation. The optical properties, including band gap, dielectric constant, and refractive index, were calculated for the SCP-CoPc/ZnO 5 wt% nanocomposite. The SCP-CoPc complex possessed a band gap of 2.89 eV, while the SCP-CoPc/ZnO 5 wt% nanocomposite had a slightly reduced band gap of 2.36 eV. The refractive indices of SCP-CoPc and SCP-CoPc/ZnO 5 wt% were also determined.","PeriodicalId":17446,"journal":{"name":"Journal of Thermoplastic Composite Materials","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135567159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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