Osama Younis, Aya Khamies, Xinchun Yang, Kamal I. Aly
Polybenzoxazines are a class of luminescent polymers that exhibit light emission properties, making them suitable for various applications. This manuscript presents the synthesis, characterization, and thermal behavior of a novel luminescent polybenzoxazine, named P‐BZ‐CP. The synthesis of P‐BZ‐CP involved a three‐stage process, starting with the formation of Bis‐OHOMe through the reaction of cyclopentanone and vanillin, followed by a Mannich condensation reaction with p‐toluidine to obtain the monomer M‐BZ‐CP. Thermal ring‐opening polymerization of M‐BZ‐CP at 250°C resulted in the synthesis of P‐BZ‐CP. Comprehensive characterization techniques, including NMR, FTIR, XRD, SEM, TGA, and DSC, were employed to analyze the structure and properties of both M‐BZ‐CP and P‐BZ‐CP. The thermal behavior of M‐BZ‐CP curing was investigated using DSC, highlighting the temperature‐dependent polymerization process. This work also provides insights into the photophysical properties of Bis‐OHOMe, M‐BZ‐CP, and P‐BZ‐CP, highlighting the role of molecular structure and concentration in determining absorption, excitation, and emission characteristics. The core benzylidene cyclopentanone chromophore contributes to the common absorption and emission features, while the additional functional groups in M‐BZ‐CP lead to concentration‐dependent photoluminescence behavior due to aggregation or excimer formation. These findings demonstrate the importance of understanding the structure–property relationships in designing optoelectronic materials with tunable photophysical properties. The findings demonstrate the successful synthesis and characterization of luminescent polybenzoxazines, providing valuable insights into their potential applications in optoelectronics.
{"title":"Luminescent polybenzoxazine: Synthesis, characterization, and photophysical properties","authors":"Osama Younis, Aya Khamies, Xinchun Yang, Kamal I. Aly","doi":"10.1002/pat.6521","DOIUrl":"https://doi.org/10.1002/pat.6521","url":null,"abstract":"Polybenzoxazines are a class of luminescent polymers that exhibit light emission properties, making them suitable for various applications. This manuscript presents the synthesis, characterization, and thermal behavior of a novel luminescent polybenzoxazine, named P‐BZ‐CP. The synthesis of P‐BZ‐CP involved a three‐stage process, starting with the formation of Bis‐OHOMe through the reaction of cyclopentanone and vanillin, followed by a Mannich condensation reaction with p‐toluidine to obtain the monomer M‐BZ‐CP. Thermal ring‐opening polymerization of M‐BZ‐CP at 250°C resulted in the synthesis of P‐BZ‐CP. Comprehensive characterization techniques, including NMR, FTIR, XRD, SEM, TGA, and DSC, were employed to analyze the structure and properties of both M‐BZ‐CP and P‐BZ‐CP. The thermal behavior of M‐BZ‐CP curing was investigated using DSC, highlighting the temperature‐dependent polymerization process. This work also provides insights into the photophysical properties of Bis‐OHOMe, M‐BZ‐CP, and P‐BZ‐CP, highlighting the role of molecular structure and concentration in determining absorption, excitation, and emission characteristics. The core benzylidene cyclopentanone chromophore contributes to the common absorption and emission features, while the additional functional groups in M‐BZ‐CP lead to concentration‐dependent photoluminescence behavior due to aggregation or excimer formation. These findings demonstrate the importance of understanding the structure–property relationships in designing optoelectronic materials with tunable photophysical properties. The findings demonstrate the successful synthesis and characterization of luminescent polybenzoxazines, providing valuable insights into their potential applications in optoelectronics.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"7 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. M. Kavitha, K. M. Eshwarappa, M. P. Shilpa, Shivakumar Jagadish Shetty, S. C. Gurumurthy, K. U. Kiran, Sachin Shet
Herein we report the method to tailor the band gap and UV absorption of polyvinyl alcohol (PVA)/graphene oxide (GO)‐silver (Ag)/glutaraldehyde (GA) hybrid polymer nanocomposites. The modifications brought by neutron irradiation to the optical and dielectric characteristics enabled the band gap and UV absorption‐tailored polymer nanocomposites to be obtained. Neutron‐irradiated samples, compared with their unirradiated counterparts, exhibit a reduction in transmittance to 78%, rendering them opaque to UV–visible light after irradiation. The energy band gap decreases from 5.25 to 4.09 eV upon irradiation. Furthermore, upon neutron‐irradiation the relaxation time increases from 7.63 × 10−4 to 0.02 s which is evident by the shift in electric modulus imaginary part (M") peak to a lower frequency region, indicating an increase in relaxation time. The Cole–Cole plot for irradiated samples demonstrates lower fitting parameter (α) values of the modified Havriliak–Negami function, indicating a departure from pure capacitor‐like behavior. The neutron irradiation leads to a decrease in conductivity from 44.6 × 10−7 to 0.09 × 10−7 S/cm.
{"title":"Hybrid polymer nanocomposites with tailored band gaps and UV absorption for advanced applications in optoelectronics and UV protection","authors":"C. M. Kavitha, K. M. Eshwarappa, M. P. Shilpa, Shivakumar Jagadish Shetty, S. C. Gurumurthy, K. U. Kiran, Sachin Shet","doi":"10.1002/pat.6515","DOIUrl":"https://doi.org/10.1002/pat.6515","url":null,"abstract":"Herein we report the method to tailor the band gap and UV absorption of polyvinyl alcohol (PVA)/graphene oxide (GO)‐silver (Ag)/glutaraldehyde (GA) hybrid polymer nanocomposites. The modifications brought by neutron irradiation to the optical and dielectric characteristics enabled the band gap and UV absorption‐tailored polymer nanocomposites to be obtained. Neutron‐irradiated samples, compared with their unirradiated counterparts, exhibit a reduction in transmittance to 78%, rendering them opaque to UV–visible light after irradiation. The energy band gap decreases from 5.25 to 4.09 eV upon irradiation. Furthermore, upon neutron‐irradiation the relaxation time increases from 7.63 × 10<jats:sup>−4</jats:sup> to 0.02 s which is evident by the shift in electric modulus imaginary part (<jats:italic>M\"</jats:italic>) peak to a lower frequency region, indicating an increase in relaxation time. The Cole–Cole plot for irradiated samples demonstrates lower fitting parameter (<jats:italic>α</jats:italic>) values of the modified Havriliak–Negami function, indicating a departure from pure capacitor‐like behavior. The neutron irradiation leads to a decrease in conductivity from 44.6 × 10<jats:sup>−7</jats:sup> to 0.09 × 10<jats:sup>−7</jats:sup> S/cm.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"49 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Roshbe S. Calolsa, T. P. Sumangala, Sreeram K. Kalpathy, Tiju Thomas, Mousumi Upadhyay Kahaly, Ariful Rahaman
Infrared (IR) filters and screens find application in energy‐efficient buildings, windows, and solar panels. Such filters benefit solar cells by preventing efficiency losses caused by heating. Polymer‐nanocomposite films are good candidates for developing IR screens. Compared to prior research on IR filters, we show how the addition of silver nanoparticles (AgNPs) can improve the material's IR reflective nature while retaining high transmittance in the visible region. Polydimethylsiloxane (PDMS) film with AgNPs (~100 μm thick) is made using the doctor blade technique. We observe no transparency loss over the 0.005–0.02 vol% loading of AgNPs in PDMS, indicating the promising application of this transparent film. Furthermore, the distribution of AgNPs is found to be uniform, ensuring consistency, and preventing agglomeration. A contact angle of ~1120 is observed for these films, which is comparable to pristine PDMS film. Using a UV–Vis–NIR spectrophotometer, greater than 7.66% weighted average reflectance is observed in the near‐infrared (NIR) region and above 91.5% transmittance in the visible region. The precise role and influence of the functional group's presence were revealed by Fourier transform infrared (FTIR) spectroscopy. The thermal analysis (TGA) of the films revealed thermal stability of up to 400°C, which is comparable to pristine PDMS. Overall, the synergistic combination of AgNPs and PDMS produces a hydrophobic IR filter with enhanced optical characteristics and thermal stability.
{"title":"Silver nanoparticles incorporated polydimethylsiloxane nanocomposite film as hydrophobic infrared filters","authors":"Roshbe S. Calolsa, T. P. Sumangala, Sreeram K. Kalpathy, Tiju Thomas, Mousumi Upadhyay Kahaly, Ariful Rahaman","doi":"10.1002/pat.6511","DOIUrl":"https://doi.org/10.1002/pat.6511","url":null,"abstract":"Infrared (IR) filters and screens find application in energy‐efficient buildings, windows, and solar panels. Such filters benefit solar cells by preventing efficiency losses caused by heating. Polymer‐nanocomposite films are good candidates for developing IR screens. Compared to prior research on IR filters, we show how the addition of silver nanoparticles (AgNPs) can improve the material's IR reflective nature while retaining high transmittance in the visible region. Polydimethylsiloxane (PDMS) film with AgNPs (<jats:italic>~</jats:italic>100 μm thick) is made using the doctor blade technique. We observe no transparency loss over the 0.005–0.02 vol% loading of AgNPs in PDMS, indicating the promising application of this transparent film. Furthermore, the distribution of AgNPs is found to be uniform, ensuring consistency, and preventing agglomeration. A contact angle of ~112<jats:sup>0</jats:sup> is observed for these films, which is comparable to pristine PDMS film. Using a UV–Vis–NIR spectrophotometer, greater than 7.66% weighted average reflectance is observed in the near‐infrared (NIR) region and above 91.5% transmittance in the visible region. The precise role and influence of the functional group's presence were revealed by Fourier transform infrared (FTIR) spectroscopy. The thermal analysis (TGA) of the films revealed thermal stability of up to 400°C, which is comparable to pristine PDMS. Overall, the synergistic combination of AgNPs and PDMS produces a hydrophobic IR filter with enhanced optical characteristics and thermal stability.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"64 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ahmad D. Telfah, Qais M. Al‐Bataineh, Ahmad A. Ahmad, Ihsan Aljarrah, Khansaa Al‐Essa, Milad Houshmand, Johannes Etzkorn, Tamara Appel
In this study, we explored the behavior of protonated polyaniline/graphene oxide (PANI‐CSA/GO) nanocomposite films with varying GO concentrations, focusing on the novel phenomenon of explosive percolation. We observed a significant increase in electrical conductivity at the explosive percolation threshold, attributed to the emergence of a percolating metallic pathway. This discovery positions PANI‐CSA/GO films as promising materials for various electronic and electrical engineering applications. Additionally, the films demonstrated consistent and repeatable photoconductivity, showing potential for use in high‐performance UV‐photodetectors, photoactive layers in solar cells, light‐emitting diodes, and energy storage devices. Structural analyses using fourier transform infrared spectroscopy (FTIR) and x‐ray diffraction (XRD) confirmed successful GO incorporation within the PANI‐CSA matrix. Different morphological features were observed depending on the GO volume fraction, with increased GO enhancing thermal stability in the conductive zone. Our findings highlight the immense potential of PANI‐CSA/GO nanocomposite films in advanced electronic applications, emphasizing their novel conductive and photoconductive properties and improved thermal stability.
在本研究中，我们探索了质子化聚苯胺/氧化石墨烯（PANI-CSA/GO）纳米复合薄膜在不同 GO 浓度下的行为，重点研究了爆炸性渗流的新现象。我们观察到在爆炸性渗流阈值处电导率显著增加，这归因于渗流金属通路的出现。这一发现使 PANI-CSA/GO 薄膜成为各种电子和电气工程应用的理想材料。此外，这些薄膜还表现出一致且可重复的光电导性，显示出在高性能紫外线光电探测器、太阳能电池光活性层、发光二极管和储能设备中的应用潜力。利用傅立叶变换红外光谱（FTIR）和 X 射线衍射（XRD）进行的结构分析证实，在 PANI-CSA 基质中成功地加入了 GO。根据 GO 体积分数的不同，可观察到不同的形态特征，GO 的增加提高了导电区的热稳定性。我们的研究结果凸显了 PANI-CSA/GO 纳米复合薄膜在先进电子应用中的巨大潜力，强调了其新颖的导电和光导特性以及更好的热稳定性。
{"title":"Photoconductivity of explosive percolation in conductive polymer/graphene oxide nanocomposite films","authors":"Ahmad D. Telfah, Qais M. Al‐Bataineh, Ahmad A. Ahmad, Ihsan Aljarrah, Khansaa Al‐Essa, Milad Houshmand, Johannes Etzkorn, Tamara Appel","doi":"10.1002/pat.6494","DOIUrl":"https://doi.org/10.1002/pat.6494","url":null,"abstract":"In this study, we explored the behavior of protonated polyaniline/graphene oxide (PANI‐CSA/GO) nanocomposite films with varying GO concentrations, focusing on the novel phenomenon of explosive percolation. We observed a significant increase in electrical conductivity at the explosive percolation threshold, attributed to the emergence of a percolating metallic pathway. This discovery positions PANI‐CSA/GO films as promising materials for various electronic and electrical engineering applications. Additionally, the films demonstrated consistent and repeatable photoconductivity, showing potential for use in high‐performance UV‐photodetectors, photoactive layers in solar cells, light‐emitting diodes, and energy storage devices. Structural analyses using fourier transform infrared spectroscopy (FTIR) and x‐ray diffraction (XRD) confirmed successful GO incorporation within the PANI‐CSA matrix. Different morphological features were observed depending on the GO volume fraction, with increased GO enhancing thermal stability in the conductive zone. Our findings highlight the immense potential of PANI‐CSA/GO nanocomposite films in advanced electronic applications, emphasizing their novel conductive and photoconductive properties and improved thermal stability.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"25 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Deniz Aydemir, Havva Gumus, Ertugrul Altuntas, Ömer Ümit Yalçın, Zeynep Eda Özan
This study investigated the mechanical, morphological, thermal, rheological properties, and accelerated aging performance of poly(lactic acid) (PLA)/polyhydroxybutyrate (PHB) blends with cellulose nanofibrils (CNFs) at low loading ratio. According to the obtained results, the addition of both PLA and CNFs were found to generally increase the mechanical properties of the biopolymer nanocomposites (BNCs). Morphological characterization with scanning electron microscopy (SEM) exhibited that cellular structure occurred in all the BNCs with adding both PLA and CNFs. Thermal stability of the BNCs improved with PLA and CNFs. The addition of CNFs and PLA generally increased the isotherms including Tg, Tc, and Tm according to differential scanning calorimetry (DSC), and it was found that the blends' crystallinity dropped because of a poor crystallinity of PLA. The addition of both PLA and CNFs provided an improvement on the rheological and viscoelastic properties of the neat PHB. XRD pattern of all the BNCs was found to be similar to the neat blends and the BNCs. In the accelerated weathering test, the adding PLA to neat PHB was found to provide more improvement than adding of CNFs.
{"title":"Biopolymer nanocomposite blends of poly(lactic acid) and polyhydroxybutyrate biopolymers reinforced with cellulose nanofibrils at low loading ratio","authors":"Deniz Aydemir, Havva Gumus, Ertugrul Altuntas, Ömer Ümit Yalçın, Zeynep Eda Özan","doi":"10.1002/pat.6520","DOIUrl":"https://doi.org/10.1002/pat.6520","url":null,"abstract":"This study investigated the mechanical, morphological, thermal, rheological properties, and accelerated aging performance of poly(lactic acid) (PLA)/polyhydroxybutyrate (PHB) blends with cellulose nanofibrils (CNFs) at low loading ratio. According to the obtained results, the addition of both PLA and CNFs were found to generally increase the mechanical properties of the biopolymer nanocomposites (BNCs). Morphological characterization with scanning electron microscopy (SEM) exhibited that cellular structure occurred in all the BNCs with adding both PLA and CNFs. Thermal stability of the BNCs improved with PLA and CNFs. The addition of CNFs and PLA generally increased the isotherms including <jats:italic>T</jats:italic><jats:sub>g</jats:sub>, <jats:italic>T</jats:italic><jats:sub>c</jats:sub>, and <jats:italic>T</jats:italic><jats:sub>m</jats:sub> according to differential scanning calorimetry (DSC), and it was found that the blends' crystallinity dropped because of a poor crystallinity of PLA. The addition of both PLA and CNFs provided an improvement on the rheological and viscoelastic properties of the neat PHB. XRD pattern of all the BNCs was found to be similar to the neat blends and the BNCs. In the accelerated weathering test, the adding PLA to neat PHB was found to provide more improvement than adding of CNFs.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"36 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141744020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mechanical damage to the surface of polyimide during manufacture and utilization may act as critical determinants of the properties and longevity of the material. In order to address this issue, this study prepared thermoplastic polyimide (TPI) films through the copolymerization of isocyanate and acid anhydride, which possesses superior self‐healing ability after being mechanical damaged. Moreover, polyimide films still retain its exceptional tensile strength (>90 MPa) with Young's modulus (E) (>3 GPa), high thermal stability (glass transition temperature (Tg) >220°C), and excellent insulation performance (breakdown strength (Eb) >180 kV/mm) after self‐healing. Introducing cross‐linked structures and flexible groups into the thermoplastic resin matrix appropriately not only imparts self‐healing capabilities to the material but also retains its excellent mechanical properties. The combination of straightforward copolymerization and distinctive self‐healing prowess renders it an appropriate strategy for confronting self‐healing challenges.
{"title":"Construction and self‐healing properties of thermoplastic polyimide based on dynamic covalent bonding","authors":"Yuanjie Gao, Jiahao Shi, Xiaorui Zhang, Ling Weng, Xue Sun, Laiweiqing Liu","doi":"10.1002/pat.6509","DOIUrl":"https://doi.org/10.1002/pat.6509","url":null,"abstract":"Mechanical damage to the surface of polyimide during manufacture and utilization may act as critical determinants of the properties and longevity of the material. In order to address this issue, this study prepared thermoplastic polyimide (TPI) films through the copolymerization of isocyanate and acid anhydride, which possesses superior self‐healing ability after being mechanical damaged. Moreover, polyimide films still retain its exceptional tensile strength (>90 MPa) with Young's modulus (<jats:italic>E</jats:italic>) (>3 GPa), high thermal stability (glass transition temperature (Tg) >220°C), and excellent insulation performance (breakdown strength (Eb) >180 kV/mm) after self‐healing. Introducing cross‐linked structures and flexible groups into the thermoplastic resin matrix appropriately not only imparts self‐healing capabilities to the material but also retains its excellent mechanical properties. The combination of straightforward copolymerization and distinctive self‐healing prowess renders it an appropriate strategy for confronting self‐healing challenges.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"44 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614205","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A sustainable polylactide (PLA)‐based multilayer food packaging film was developed to improve neat PLA films' modest mechanical, thermal, and water/gas barrier properties. To improve the desired properties and impart antimicrobial aspects to the composite films, graphene nanoplatelets (GNP), and geraniol (GER) were reinforced into single‐layered PLA films. The project aimed to assemble three monolayers into multilayer films (MLF) through a coextrusion process, keeping the PLA‐GER layer in the core. X‐ray diffractograms, micrographs, and roughness parameters of the films demonstrated the dispersion of GNP in the film. Thermogravimetric analysis confirmed an enhancement in the thermal stability of the MLF by around 8°C when compared against single‐layer PLA films. An improvement in mechanical rigidity was supported by tensile (>87%) and rheological measurements. The polymers exhibit liquid‐like behavior in melts. Barrier properties did not improve for the MLF due to the agglomeration of GNP. The excellent antimicrobial properties of the MLFs for 3 weeks of storage at refrigerated conditions against both gram‐positive and gram‐negative pathogens were attributed to the release of GER from the film into the packed chicken samples and proved their potential for use in the food industry.
我们开发了一种可持续的聚乳酸（PLA）基多层食品包装薄膜，以改善纯聚乳酸薄膜适度的机械、热和水/气体阻隔性能。为了提高复合薄膜的预期性能并赋予其抗菌性，在单层聚乳酸薄膜中添加了石墨烯纳米片（GNP）和香叶醇（GER）。该项目旨在通过共挤工艺将三个单层膜组合成多层膜（MLF），并将聚乳酸-香叶醇层保持在核心位置。薄膜的 X 射线衍射图、显微照片和粗糙度参数显示了 GNP 在薄膜中的分散情况。热重分析证实，与单层聚乳酸薄膜相比，MLF 的热稳定性提高了约 8°C。拉伸（>87%）和流变测量也证明了机械刚性的改善。聚合物在熔体中表现出类似液体的行为。由于 GNP 的聚结，MLF 的阻隔性能没有得到改善。MLF 在冷藏条件下储存 3 周后对革兰氏阳性和革兰氏阴性病原体都具有优异的抗菌性能，这归功于 GER 从薄膜中释放到包装好的鸡肉样品中，并证明了它们在食品工业中的应用潜力。
{"title":"Microstructural, mechanical, thermo‐rheological, barrier, and antimicrobial properties of coextruded tri‐layer polylactide/encapsulated geraniol/polylactide‐graphene nanoplatelets films","authors":"Jasim Ahmed, Anibal Bher, Rafael Auras","doi":"10.1002/pat.6488","DOIUrl":"https://doi.org/10.1002/pat.6488","url":null,"abstract":"A sustainable polylactide (PLA)‐based multilayer food packaging film was developed to improve neat PLA films' modest mechanical, thermal, and water/gas barrier properties. To improve the desired properties and impart antimicrobial aspects to the composite films, graphene nanoplatelets (GNP), and geraniol (GER) were reinforced into single‐layered PLA films. The project aimed to assemble three monolayers into multilayer films (MLF) through a coextrusion process, keeping the PLA‐GER layer in the core. X‐ray diffractograms, micrographs, and roughness parameters of the films demonstrated the dispersion of GNP in the film. Thermogravimetric analysis confirmed an enhancement in the thermal stability of the MLF by around 8°C when compared against single‐layer PLA films. An improvement in mechanical rigidity was supported by tensile (>87%) and rheological measurements. The polymers exhibit liquid‐like behavior in melts. Barrier properties did not improve for the MLF due to the agglomeration of GNP. The excellent antimicrobial properties of the MLFs for 3 weeks of storage at refrigerated conditions against both gram‐positive and gram‐negative pathogens were attributed to the release of GER from the film into the packed chicken samples and proved their potential for use in the food industry.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"29 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
John Praveen Kumar John Kennedy, Jothi Basu Muthuramalingam, Vignesh Kumar Balasubramanian, Muthumari Balakrishnan, Kavitha Murugan, Kumar Ponnuchamy
The current study aims to synthesize cross‐linked alginate–gum arabic, a polysaccharide biopolymer composite, to evaluate its efficacy for the controlled release of urea. The alginate–gum arabic solution was prepared in a 2:1 ratio, and urea was entrapped in three different amounts: 50 mg for SG1, 100 mg for SG2, and 150 mg for SG3. CaCl2 used as the crosslinker, and the urea‐entrapped alginate–gum arabic hydrogel beads were produced using ionotropic gelation method. Produced beads were underwent physical evaluation to analyze their size, porosity, and swelling behavior. The highest diameter was exhibited in SG3 at 3.60 ± 0.01 mm. Additionally, the highest porosity was observed in SG3 beads, measuring 63.6% ± 0.33%. The release of urea was quantified using the DiacetylMonoxim (DAM)–UV visible spectroscopy method. Further, the characterization of the produced hydrogel beads was analyzed using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analyses (TGA). FTIR revealed the characteristic band at 3770 and 2355 cm−1, indicating the presence of urea entrapped in alginate—gum arabic beads. TGA analyses indicates that the good thermal stability of the produced beads.
{"title":"Controlled release of urea using negatively charged polysaccharides","authors":"John Praveen Kumar John Kennedy, Jothi Basu Muthuramalingam, Vignesh Kumar Balasubramanian, Muthumari Balakrishnan, Kavitha Murugan, Kumar Ponnuchamy","doi":"10.1002/pat.6508","DOIUrl":"https://doi.org/10.1002/pat.6508","url":null,"abstract":"The current study aims to synthesize cross‐linked alginate–gum arabic, a polysaccharide biopolymer composite, to evaluate its efficacy for the controlled release of urea. The alginate–gum arabic solution was prepared in a 2:1 ratio, and urea was entrapped in three different amounts: 50 mg for SG1, 100 mg for SG2, and 150 mg for SG3. CaCl<jats:sub>2</jats:sub> used as the crosslinker, and the urea‐entrapped alginate–gum arabic hydrogel beads were produced using ionotropic gelation method. Produced beads were underwent physical evaluation to analyze their size, porosity, and swelling behavior. The highest diameter was exhibited in SG3 at 3.60 ± 0.01 mm. Additionally, the highest porosity was observed in SG3 beads, measuring 63.6% ± 0.33%. The release of urea was quantified using the DiacetylMonoxim (DAM)–UV visible spectroscopy method. Further, the characterization of the produced hydrogel beads was analyzed using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and thermogravimetric analyses (TGA). FTIR revealed the characteristic band at 3770 and 2355 cm<jats:sup>−1</jats:sup>, indicating the presence of urea entrapped in alginate—gum arabic beads. TGA analyses indicates that the good thermal stability of the produced beads.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"44 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nadiisah Nurul Inayah, Ahmad Kusumaatmaja, Rini Murtafi'atin
Nanofiber is a material used as a drug carrier matrix in drug release materials. Its morphology has high porosity and good flexibility, making it suitable for this purpose. The use of nanofiber as a carrier matrix in slow‐release fertilizer (SRF) material is expected to provide a solution for releasing fertilizer into the soil more measurably and efficiently In this study, PVA/Urea/TiO2 nanofibers were fabricated using the electrospinning method. PVA/Urea/TiO2 SRFs were prepared using varying urea mass percentages (10%, 15%, and 20% of PVA mass) and the concentration of titanium dioxide suspension solution (0, 0.2, and 0.4 mL). Every sample was analyzed using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) and tested using contact angle and slow‐release tests. From SEM characterizations, all samples showed the ability to form nanofiber. It was found that the membrane diameter sizes for each sample A, B, C, D, E, and F were 341 ± 5, 309 ± 12, 109 ± 3, 313 ± 10, 109 ± 3, and 158 ± 6 nm, respectively. The FTIR characterizations showed that all the matrix samples successfully contained the nitrogen group, which was found at wave number 1605 cm−1 (NH deformation), 1574 cm−1 (CN stretching), and 3430 cm−1 (NH stretching). The SEM mapping images confirmed the presence of titanium dioxide (green dots). The contact angle test showed that all samples had hydrophilic properties (the contact angle value lower than 90°), and the greatest value of contact angle measurement was 31.08° for sample C/E (sample with the most presence of TiO2 suspension solution 0.4 mL). The sample with the greatest TiO2 suspension concentration (0.4 mL) had the longest urea release time, lasting 8 days. This result indicates the addition of TiO2, can potentially suppress the hydrophilic properties of the PVA membrane. It is found that the addition of TiO2 influenced the membrane's hydrophilicity, consequently increasing the release rate. This study used the Korsmeyer–Peppas mathematical kinetic model to show that diffusion and swelling are release mechanisms for SRF membranes.
{"title":"Slow‐release fertilizer behavior of polyvinyl alcohol (PVA)/urea/TiO2 nanofiber membrane","authors":"Nadiisah Nurul Inayah, Ahmad Kusumaatmaja, Rini Murtafi'atin","doi":"10.1002/pat.6472","DOIUrl":"https://doi.org/10.1002/pat.6472","url":null,"abstract":"Nanofiber is a material used as a drug carrier matrix in drug release materials. Its morphology has high porosity and good flexibility, making it suitable for this purpose. The use of nanofiber as a carrier matrix in slow‐release fertilizer (SRF) material is expected to provide a solution for releasing fertilizer into the soil more measurably and efficiently In this study, PVA/Urea/TiO<jats:sub>2</jats:sub> nanofibers were fabricated using the electrospinning method. PVA/Urea/TiO<jats:sub>2</jats:sub> SRFs were prepared using varying urea mass percentages (10%, 15%, and 20% of PVA mass) and the concentration of titanium dioxide suspension solution (0, 0.2, and 0.4 mL). Every sample was analyzed using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) and tested using contact angle and slow‐release tests. From SEM characterizations, all samples showed the ability to form nanofiber. It was found that the membrane diameter sizes for each sample A, B, C, D, E, and F were 341 ± 5, 309 ± 12, 109 ± 3, 313 ± 10, 109 ± 3, and 158 ± 6 nm, respectively. The FTIR characterizations showed that all the matrix samples successfully contained the nitrogen group, which was found at wave number 1605 cm<jats:sup>−1</jats:sup> (NH deformation), 1574 cm<jats:sup>−1</jats:sup> (CN stretching), and 3430 cm<jats:sup>−1</jats:sup> (NH stretching). The SEM mapping images confirmed the presence of titanium dioxide (green dots). The contact angle test showed that all samples had hydrophilic properties (the contact angle value lower than 90°), and the greatest value of contact angle measurement was 31.08° for sample C/E (sample with the most presence of TiO<jats:sub>2</jats:sub> suspension solution 0.4 mL). The sample with the greatest TiO<jats:sub>2</jats:sub> suspension concentration (0.4 mL) had the longest urea release time, lasting 8 days. This result indicates the addition of TiO<jats:sub>2</jats:sub>, can potentially suppress the hydrophilic properties of the PVA membrane. It is found that the addition of TiO<jats:sub>2</jats:sub> influenced the membrane's hydrophilicity, consequently increasing the release rate. This study used the Korsmeyer–Peppas mathematical kinetic model to show that diffusion and swelling are release mechanisms for SRF membranes.","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"90 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The life journey of Professor S. Penczek through the realm of polymer science","authors":"K. Matyjaszewski, S. Slomkowski","doi":"10.1002/pat.6493","DOIUrl":"https://doi.org/10.1002/pat.6493","url":null,"abstract":"","PeriodicalId":20382,"journal":{"name":"Polymers for Advanced Technologies","volume":"17 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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