A. Caramitu, Ioana Ion, Mihai Marin, A. Borş, R. Ciobanu, Cristina-Mihaela Schreiner, Mihaela Aradoaei
The paper presents the characterization of 5 polymer composite materials with a poly-propylene (PP) matrix obtained with different (mass) concentrations of strontium ferrite (Fe12SrO19) reinforcement that have synergistic protective properties against electrostatic discharges (ESD) and electromagnetic impulses (EMI). These types of composites can be used to protect electronic equipment. To this purpose, suitable polymer composites were developed using SrFe12O19 type filler in two forms (powder and concentrate). The weight ratio of the PP/SrFe12O19 composites obtained by the extrusion process and injection from the melt is 75/25 and 70/30. The characterization of these composite materials consisted of carrying out some physico-chemical tests to determine the hydrostatic density and the resistance to the action of water, as well as FTIR, UV-Vis analyzes and dielectric, magnetic and functional tests to identify the simultaneous protection performance at electromagnetic shielding and electrostatic discharges, which can occur in the electro-technical, electronics and automotive industries. It is also found that all composite materials presented reflection shielding properties (SER) in the range: -71.5 dB...to -56.7 dB, indicating very low absorption shielding. The best performing material was the PP/SrFe12O19 powder composite with a weight ratio of 70/30. At the same time, EDS tests were also carried out on these materials. For these applications, the surface resistance Rs and the point-to-point resistance Rp were tested. Recommended composites for simultaneous EMI and sensitivity to electrostatic discharges (ESD) functionality, in order of their performance, are M2 (with 30% ferrite powder) and M1 (with 25% ferrite powder). M4 composite (with 30% ferrite powder concentrate) can also be used at the limit. Following the research carried out, the obtained results recommend the composite with promising simultaneous operations as M2 (with 30% ferrite powder). The element of originality consists of obtaining polymer composites with simultaneous properties of protection against electromagnetic impulses and electrostatic discharges.
{"title":"Characterization of Some Functional Polymeric Composites in a Synergistic Regime of Protection at Electromagnetic Shielding and Electrostatic Transfer","authors":"A. Caramitu, Ioana Ion, Mihai Marin, A. Borş, R. Ciobanu, Cristina-Mihaela Schreiner, Mihaela Aradoaei","doi":"10.37358/mp.24.2.5720","DOIUrl":"https://doi.org/10.37358/mp.24.2.5720","url":null,"abstract":"\u0000The paper presents the characterization of 5 polymer composite materials with a poly-propylene (PP) matrix obtained with different (mass) concentrations of strontium ferrite (Fe12SrO19) reinforcement that have synergistic protective properties against electrostatic discharges (ESD) and electromagnetic impulses (EMI). These types of composites can be used to protect electronic equipment. To this purpose, suitable polymer composites were developed using SrFe12O19 type filler in two forms (powder and concentrate). The weight ratio of the PP/SrFe12O19 composites obtained by the extrusion process and injection from the melt is 75/25 and 70/30. The characterization of these composite materials consisted of carrying out some physico-chemical tests to determine the hydrostatic density and the resistance to the action of water, as well as FTIR, UV-Vis analyzes and dielectric, magnetic and functional tests to identify the simultaneous protection performance at electromagnetic shielding and electrostatic discharges, which can occur in the electro-technical, electronics and automotive industries. It is also found that all composite materials presented reflection shielding properties (SER) in the range: -71.5 dB...to -56.7 dB, indicating very low absorption shielding. The best performing material was the PP/SrFe12O19 powder composite with a weight ratio of 70/30. At the same time, EDS tests were also carried out on these materials. For these applications, the surface resistance Rs and the point-to-point resistance Rp were tested. Recommended composites for simultaneous EMI and sensitivity to electrostatic discharges (ESD) functionality, in order of their performance, are M2 (with 30% ferrite powder) and M1 (with 25% ferrite powder). M4 composite (with 30% ferrite powder concentrate) can also be used at the limit. Following the research carried out, the obtained results recommend the composite with promising simultaneous operations as M2 (with 30% ferrite powder). The element of originality consists of obtaining polymer composites with simultaneous properties of protection against electromagnetic impulses and electrostatic discharges.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141682843","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}
Xilong Zheng, Jinshuo Yan, Yi Wang, Baitao Sun, Peng Li
In order to investigate the mechanical properties of polyurethane cement (PUC) composite materials, axial tensile test, acid and alkali corrosion resistance test, bond test with concrete, and bond test with steel bars were conducted. The axial tensile results show that the tensile strength of PUC material is 31.11MPa, the stress-strain curve for axial tensile behavior of the material is obtained through fitting. To explore the durability of PUC materials, acid-alkali-salt corrosion resistance test is carried out, the results show that the PUC material has good resistance to acid and alkali corrosion. The failure mode of the bond test between PUC material and concrete is internal cohesion failure of concrete material, indicating good bond performance of PUC material. Axial tensile test of PUC material is carried out at different temperatures (-40℃~60℃). When subjected to temperatures between 40�C and 60�C, the strength of materials does not deteriorate. However, it is noteworthy that the material�s ability to withstand tensile strain significantly increases as temperatures rise to 60�C. The bonding strength between PUC material and steel bar increases with an increase in protective layer thickness, and at a thickness of 70 mm, the maximum bond stress is achieved at 16.38 MPa. On the other hand, the strength of the bond reduces as the anchorage length increases. Smooth round bars demonstrate a significantly lower bond strength compared to deformed bars, as their maximum bond strength is at approximately 47.4% of that of the deformed bars under the same conditions.
{"title":"Mechanics and Durability of Polyurethane Cement Composite (PUC) Material","authors":"Xilong Zheng, Jinshuo Yan, Yi Wang, Baitao Sun, Peng Li","doi":"10.37358/mp.24.2.5719","DOIUrl":"https://doi.org/10.37358/mp.24.2.5719","url":null,"abstract":"\u0000In order to investigate the mechanical properties of polyurethane cement (PUC) composite materials, axial tensile test, acid and alkali corrosion resistance test, bond test with concrete, and bond test with steel bars were conducted. The axial tensile results show that the tensile strength of PUC material is 31.11MPa, the stress-strain curve for axial tensile behavior of the material is obtained through fitting. To explore the durability of PUC materials, acid-alkali-salt corrosion resistance test is carried out, the results show that the PUC material has good resistance to acid and alkali corrosion. The failure mode of the bond test between PUC material and concrete is internal cohesion failure of concrete material, indicating good bond performance of PUC material. Axial tensile test of PUC material is carried out at different temperatures (-40℃~60℃). When subjected to temperatures between 40�C and 60�C, the strength of materials does not deteriorate. However, it is noteworthy that the material�s ability to withstand tensile strain significantly increases as temperatures rise to 60�C. The bonding strength between PUC material and steel bar increases with an increase in protective layer thickness, and at a thickness of 70 mm, the maximum bond stress is achieved at 16.38 MPa. On the other hand, the strength of the bond reduces as the anchorage length increases. Smooth round bars demonstrate a significantly lower bond strength compared to deformed bars, as their maximum bond strength is at approximately 47.4% of that of the deformed bars under the same conditions.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141682430","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}
Gabriel Saracu, Sorin Sarateanu, V. Bria, Mihaela Buciumeanu, A. Cîrciumaru
The basic idea of this study is based on the hypothesis that it is possible to obtain nanostructures by stimulating local chemical reactions. Starting with this hypothesis we assumed that it is possible to disperse some inorganic agent into the epoxy resin and stimulating the mixtures we could get some nano-structures what are changing the basic electric behaviour of the polymer matrix. We dissolved some metallic chlorides in DMF (dimethylformamide) and we mixed together the solution with the epoxy resin (the main component). Applying various external stimuli we get materials showing various properties, different from the epoxy resin properties. The electric photoconductivity is increased (in some cases) but the mechanical properties are damaged due the solvent presence into the polymer matrix.
{"title":"Enhanced Electric Photoconductivity of Modified Epoxy Resin","authors":"Gabriel Saracu, Sorin Sarateanu, V. Bria, Mihaela Buciumeanu, A. Cîrciumaru","doi":"10.37358/mp.24.1.5710","DOIUrl":"https://doi.org/10.37358/mp.24.1.5710","url":null,"abstract":"\u0000The basic idea of this study is based on the hypothesis that it is possible to obtain nanostructures by stimulating local chemical reactions. Starting with this hypothesis we assumed that it is possible to disperse some inorganic agent into the epoxy resin and stimulating the mixtures we could get some nano-structures what are changing the basic electric behaviour of the polymer matrix. We dissolved some metallic chlorides in DMF (dimethylformamide) and we mixed together the solution with the epoxy resin (the main component). Applying various external stimuli we get materials showing various properties, different from the epoxy resin properties. The electric photoconductivity is increased (in some cases) but the mechanical properties are damaged due the solvent presence into the polymer matrix.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140783856","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}
Xin Ji, Mingxuan Chen, Xueliang Jiang, Feng You, Chu Yao
Polyurethane foam as an important sound absorption material is limited by the poor flame resistances in building field, but the modifications of flame resistances tend to have adverse effects on the sound absorption performance. Herein, dibutyltin dilaurate and triethylenediamine are used simultaneously as catalysts, and four new types of flame retardant polyether polyols (FPMPO) are synthesized and combined with modified expanded graphite (PEG) to prepare the flame resistance flexible polyurethane foam (FFPUF) by one-step method. The results show that the combination of the two catalysts can control the cell structure of FFPUF availably for sound absorption. The FPMPO have little negative influence on the cell morphology and the sound absorption performance of FFPUF, but the increase of flame resistances is finite due to the limited amount of FPMPO. In order to improve the flame retardant properties further, the FPMPO and the PEG are combined in the modification. Benefitting by the effective control structure and the modification with composite flame retardant, the FFPUF shows excellent sound absorption and flame retardant properties. The LOI value of FFPUF is 33.4 and the vertical burning level reaches V-0, and the average sound absorption coefficient maintains 0.68 in the 800-6300 Hz range.
{"title":"Preparation and Modification of Flexible Polyurethane Foam for Effective Flame Resistance and Sound Absorption","authors":"Xin Ji, Mingxuan Chen, Xueliang Jiang, Feng You, Chu Yao","doi":"10.37358/mp.24.1.5708","DOIUrl":"https://doi.org/10.37358/mp.24.1.5708","url":null,"abstract":"\u0000Polyurethane foam as an important sound absorption material is limited by the poor flame resistances in building field, but the modifications of flame resistances tend to have adverse effects on the sound absorption performance. Herein, dibutyltin dilaurate and triethylenediamine are used simultaneously as catalysts, and four new types of flame retardant polyether polyols (FPMPO) are synthesized and combined with modified expanded graphite (PEG) to prepare the flame resistance flexible polyurethane foam (FFPUF) by one-step method. The results show that the combination of the two catalysts can control the cell structure of FFPUF availably for sound absorption. The FPMPO have little negative influence on the cell morphology and the sound absorption performance of FFPUF, but the increase of flame resistances is finite due to the limited amount of FPMPO. In order to improve the flame retardant properties further, the FPMPO and the PEG are combined in the modification. Benefitting by the effective control structure and the modification with composite flame retardant, the FFPUF shows excellent sound absorption and flame retardant properties. The LOI value of FFPUF is 33.4 and the vertical burning level reaches V-0, and the average sound absorption coefficient maintains 0.68 in the 800-6300 Hz range.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140757011","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}
Lisha Zhao, Yang Lv, Jiale Chen, Hao Huang, Xiaoqin Zhou, Yanhua Cai
To overcome PLLA�s poor crystallization capability, using nucleating agent as crystallization improvement strategy was performed in this study. PPAPH as PLLA�s an organic nucleating agent was firstly synthesized, and then PLLA was blended with different PPAPH loading through melting blend method, the resulting influences of PPAPH on PLLA�s performances were investigated using the relevant testing instruments. Melt-crystallization revealed that PPAPH played important role in promoting PLLA�s crystallization through providing effective sites of heterogeneous nucleation, and effect of PPAPH loading on PLLA�s melt-crystallization was very poor, indicating that low PPAPH loading could cause PLLA to possess powerful crystallization capacity. In addition, the relative low final melting temperature was beneficial for PLLA/PPAPH�s crystallization. However, an increase of cooling rate during cooling stage weakened PLLA/PPAPH�s crystallization capacity. PLLA/PPAPH�s cold-crystallization suggested that PPAPH had an inhibition effect on cold-crystallization process to some extent. Melting behaviors depended on heating rate and previous crystallization including melt-crystallization at various cooling rates and isothermal crystallization at various crystallization temperatures. PPAPH enhanced PLLA�s fluidity, tensile modulus and tensile strength. Unfortunately, PLLA�s transmittance was seriously weakened as PPAPH loading increased, as well as the elongation at break continuously decreased.
{"title":"The Performance Investigation of PLLA/PPAPH: The Influence of PPAPH as Heterogeneous Crystal Nuclei","authors":"Lisha Zhao, Yang Lv, Jiale Chen, Hao Huang, Xiaoqin Zhou, Yanhua Cai","doi":"10.37358/mp.24.1.5711","DOIUrl":"https://doi.org/10.37358/mp.24.1.5711","url":null,"abstract":"\u0000To overcome PLLA�s poor crystallization capability, using nucleating agent as crystallization improvement strategy was performed in this study. PPAPH as PLLA�s an organic nucleating agent was firstly synthesized, and then PLLA was blended with different PPAPH loading through melting blend method, the resulting influences of PPAPH on PLLA�s performances were investigated using the relevant testing instruments. Melt-crystallization revealed that PPAPH played important role in promoting PLLA�s crystallization through providing effective sites of heterogeneous nucleation, and effect of PPAPH loading on PLLA�s melt-crystallization was very poor, indicating that low PPAPH loading could cause PLLA to possess powerful crystallization capacity. In addition, the relative low final melting temperature was beneficial for PLLA/PPAPH�s crystallization. However, an increase of cooling rate during cooling stage weakened PLLA/PPAPH�s crystallization capacity. PLLA/PPAPH�s cold-crystallization suggested that PPAPH had an inhibition effect on cold-crystallization process to some extent. Melting behaviors depended on heating rate and previous crystallization including melt-crystallization at various cooling rates and isothermal crystallization at various crystallization temperatures. PPAPH enhanced PLLA�s fluidity, tensile modulus and tensile strength. Unfortunately, PLLA�s transmittance was seriously weakened as PPAPH loading increased, as well as the elongation at break continuously decreased.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140784051","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}
In this paper, new epoxy resin/rubber powder/hollow beads three-phase composites were prepared by designing the incorporation of fly ash hollow beads with different mass fractions (5%, 10%, 15%, and 20%) as new reinforcing phases into epoxy resin/rubber powder two-phase composites with 5% mass fraction of carbon black rubber powder. Quasi-static compression tests were conducted at room temperature to test the compressive properties of the oxygen resin/rubber powder/hollow beads composites. Calculate the energy absorption properties and energy absorption efficiency of the composites from the compression curves. Fracture characteristics of compressed material specimens with microscopic morphology were observed by scanning electron microscopy. By systematically analyzing the effect of fly ash hollow beads content on the mechanical properties of epoxy resin/rubber powder/hollow beads three-phase composites, it was found that fly ash hollow beads as reinforcing materials can effectively improve the brittleness and yield strength of epoxy resin/rubber powder as well as the energy-absorbing properties and efficiency of the composites. The energy absorption properties of the epoxy resin/rubber powder/hollow beads composites increased and then decreased with the increase in the mass fraction of fly ash hollow beads. In the epoxy resin/rubber powder/hollow beads composites, the most significant performance was observed when the mass fraction of fly ash was 10%.
{"title":"Mechanical Properties and Failure Behavior of Epoxy Rubber Powder Composites Reinforced with Hollow Beads","authors":"Wu Zhe, Zhang Zhen, Xinlong Zhang, Haifeng Jiang, Zhongchi Zhang","doi":"10.37358/mp.24.1.5703","DOIUrl":"https://doi.org/10.37358/mp.24.1.5703","url":null,"abstract":"\u0000In this paper, new epoxy resin/rubber powder/hollow beads three-phase composites were prepared by designing the incorporation of fly ash hollow beads with different mass fractions (5%, 10%, 15%, and 20%) as new reinforcing phases into epoxy resin/rubber powder two-phase composites with 5% mass fraction of carbon black rubber powder. Quasi-static compression tests were conducted at room temperature to test the compressive properties of the oxygen resin/rubber powder/hollow beads composites. Calculate the energy absorption properties and energy absorption efficiency of the composites from the compression curves. Fracture characteristics of compressed material specimens with microscopic morphology were observed by scanning electron microscopy. By systematically analyzing the effect of fly ash hollow beads content on the mechanical properties of epoxy resin/rubber powder/hollow beads three-phase composites, it was found that fly ash hollow beads as reinforcing materials can effectively improve the brittleness and yield strength of epoxy resin/rubber powder as well as the energy-absorbing properties and efficiency of the composites. The energy absorption properties of the epoxy resin/rubber powder/hollow beads composites increased and then decreased with the increase in the mass fraction of fly ash hollow beads. In the epoxy resin/rubber powder/hollow beads composites, the most significant performance was observed when the mass fraction of fly ash was 10%.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140791608","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}
Anca Bordianu, Valentin Titus Grigorean, A. Bobircă, Mircea Liţescu, F. Bobircă
Polypropylene is a material recognized for its tensile properties, as well as for the stability of its chemical structure, an important element that has allowed the use of this material on a large scale, in a wide range of fields of activity, especially in the medical field. This study aims to highlight the structural properties of polypropylene, which contribute to improving the prognosis of vascular microsutures, through the comparative analysis of the results obtained after performing lymphatico-venous anastomosis in lymphedema patients. The research was focused on analyzing the importance of the diameter of the polypropylene thread and its tensile properties on the patency of the lymphatic anastomosis, through the comparative analysis of two groups of patients who benefited from micro-vascular sutures. The database was made up of a group of 82 patients divided into two groups who benefited from supermicrosurgical interventions by using polypropylene thread 11.0 (37 cases involving 148 anastomoses), respectively 12.0 (45 cases involving 180 anastomoses). The results of the research revealed that the group of patients who benefited from microvascular anastomoses using 12.0 poly-propylene thread recorded both better anastomosis patency rates and a significantly reduced rate of complications due to the rejection reaction of the suture material, under the conditions a significantly reduced tensile strength.
{"title":"Impact of Polypropylene Sutures Phisical Properties on Lymphaticovenous Anastomosis in Lymphedema Patients","authors":"Anca Bordianu, Valentin Titus Grigorean, A. Bobircă, Mircea Liţescu, F. Bobircă","doi":"10.37358/mp.24.1.5707","DOIUrl":"https://doi.org/10.37358/mp.24.1.5707","url":null,"abstract":"\u0000Polypropylene is a material recognized for its tensile properties, as well as for the stability of its chemical structure, an important element that has allowed the use of this material on a large scale, in a wide range of fields of activity, especially in the medical field. This study aims to highlight the structural properties of polypropylene, which contribute to improving the prognosis of vascular microsutures, through the comparative analysis of the results obtained after performing lymphatico-venous anastomosis in lymphedema patients. The research was focused on analyzing the importance of the diameter of the polypropylene thread and its tensile properties on the patency of the lymphatic anastomosis, through the comparative analysis of two groups of patients who benefited from micro-vascular sutures. The database was made up of a group of 82 patients divided into two groups who benefited from supermicrosurgical interventions by using polypropylene thread 11.0 (37 cases involving 148 anastomoses), respectively 12.0 (45 cases involving 180 anastomoses). The results of the research revealed that the group of patients who benefited from microvascular anastomoses using 12.0 poly-propylene thread recorded both better anastomosis patency rates and a significantly reduced rate of complications due to the rejection reaction of the suture material, under the conditions a significantly reduced tensile strength.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140763292","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 aim of the study was to experimentally verify the enhancement of certain mechanical properties of a composite material consisting of unsaturated polyester matrix reinforced with fiberglass, by incorporating specific proportions of sodium aluminosilicate (SAS) powders and talc as fillers for the fabrication of large wind turbine blades. Samples composed of these materials, with varying combinations of the added components, underwent testing for tensile and bending strength, and experiments were conducted to determine their modulus of elasticity. The findings indicate that the inclusion of SAS in the matrix material resulted in increased values of tensile strength and modulus of elasticity up to certain proportions. Solely adding talc to the matrix material led to a rise in bending strength. Increasing the talc percentage in the matrix material reinforced with 20% fiberglass resulted in decreased tensile strength and elastic modulus of the samples, while incorporating a blend of SAS and talc into the matrix material reinforced with 20% fiberglass significantly boosted the elastic modulus and tensile strength of the samples under tensile conditions.
这项研究的目的是通过实验验证，在制造大型风力涡轮机叶片时，加入特定比例的硅酸钠（SAS）粉末和滑石粉作为填料，可提高由玻璃纤维增强的不饱和聚酯基体组成的复合材料的某些机械性能。由这些材料（添加成分的组合各不相同）组成的样品接受了拉伸和弯曲强度测试，并进行了弹性模量测定实验。研究结果表明，在基体材料中加入 SAS 可提高拉伸强度和弹性模量值，但必须达到一定的比例。仅在基体材料中加入滑石粉会导致弯曲强度增加。在使用 20% 玻璃纤维增强的基体材料中增加滑石粉的比例会导致样品的拉伸强度和弹性模量降低，而在使用 20% 玻璃纤维增强的基体材料中加入 SAS 和滑石粉的混合物则会显著提高样品在拉伸条件下的弹性模量和拉伸强度。
{"title":"Experimental Studies for the Creation of Composite Materials with Increased Static Mechanical Characteristics","authors":"Imad Rezakalla Antypas, T. Savostina","doi":"10.37358/mp.24.1.5706","DOIUrl":"https://doi.org/10.37358/mp.24.1.5706","url":null,"abstract":"\u0000The aim of the study was to experimentally verify the enhancement of certain mechanical properties of a composite material consisting of unsaturated polyester matrix reinforced with fiberglass, by incorporating specific proportions of sodium aluminosilicate (SAS) powders and talc as fillers for the fabrication of large wind turbine blades. Samples composed of these materials, with varying combinations of the added components, underwent testing for tensile and bending strength, and experiments were conducted to determine their modulus of elasticity. The findings indicate that the inclusion of SAS in the matrix material resulted in increased values of tensile strength and modulus of elasticity up to certain proportions. Solely adding talc to the matrix material led to a rise in bending strength. Increasing the talc percentage in the matrix material reinforced with 20% fiberglass resulted in decreased tensile strength and elastic modulus of the samples, while incorporating a blend of SAS and talc into the matrix material reinforced with 20% fiberglass significantly boosted the elastic modulus and tensile strength of the samples under tensile conditions.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140756622","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}
M. Stelescu, Adriana Stefan, M. Sonmez, M. Nițuică, M. Georgescu
This paper describes the development of new types of dynamically cross-linked thermoplastic elastomers based on ethylene-propylene-terpolymer rubber and low-density polyethylene, reinforced with plasticized starch and montmorillonite with a chemically modified surface. An octylphenol-formaldehyde resin in the presence of stannous chloride dihydrate was used as a vulcanizing agent. The samples were obtained on a Brabender Plasti-Corder mixer, at appropriate temperatures and rotation speeds, using the dynamic vulcanization method and the melt intercalation technique. The mixtures obtained were modeled in the form of plates with standard dimensions using specific molds and a laboratory-scale electrical press. The obtained samples were analyzed from the point of view of the physical-mechanical properties, the melt flow index, as well as from the structural and morphological point of view. It was observed that the characteristics of the samples are influenced by both the composition and the methods of obtaining used. According to the obtained characteristics, the new elasto-plastic materials can be used in fields such as the footwear industry (for the production of: soles, heels, protective boots), in the rubber and plastics industry, the automobile industry, agriculture or construction (when making gaskets, technical items, hoses, etc.). They can be easily processed into different finished products by methods specific to plastics.
{"title":"Elasto-Plastic Materials based on EPDM Rubber, LDPE, Plasticized Starch and OMMT","authors":"M. Stelescu, Adriana Stefan, M. Sonmez, M. Nițuică, M. Georgescu","doi":"10.37358/mp.24.1.5709","DOIUrl":"https://doi.org/10.37358/mp.24.1.5709","url":null,"abstract":"\u0000This paper describes the development of new types of dynamically cross-linked thermoplastic elastomers based on ethylene-propylene-terpolymer rubber and low-density polyethylene, reinforced with plasticized starch and montmorillonite with a chemically modified surface. An octylphenol-formaldehyde resin in the presence of stannous chloride dihydrate was used as a vulcanizing agent. The samples were obtained on a Brabender Plasti-Corder mixer, at appropriate temperatures and rotation speeds, using the dynamic vulcanization method and the melt intercalation technique. The mixtures obtained were modeled in the form of plates with standard dimensions using specific molds and a laboratory-scale electrical press. The obtained samples were analyzed from the point of view of the physical-mechanical properties, the melt flow index, as well as from the structural and morphological point of view. It was observed that the characteristics of the samples are influenced by both the composition and the methods of obtaining used. According to the obtained characteristics, the new elasto-plastic materials can be used in fields such as the footwear industry (for the production of: soles, heels, protective boots), in the rubber and plastics industry, the automobile industry, agriculture or construction (when making gaskets, technical items, hoses, etc.). They can be easily processed into different finished products by methods specific to plastics.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140784399","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}
A. Meius, Cătălina Voiosu, I. Ioniță, A. Rusescu, Oana Ruxandra Alius, Cristina Aura Panea, V. Zainea, R. Hainăroșie
Anterior skull base reconstruction is a complex surgical procedure that requires careful evaluation of the patient s condition and the expertise of a skilled surgical team. Skull base reconstruction objectives focus on providing water-tight separation between the intracranial and extracranial contents, closing dead space, and returning reasonable form and function. Regarding the reconstruction options, the main categories are non-vascular grafts, loco-regional flaps, free tissue transfer or bony-free flaps. The major challenge in reconstructive surgery is the effective sealing of the defect due to its uneven edges and the conformation of the anterior skull base. Given this challenge, we are considering the possibility of designing a prosthetic for anterior skull base defects using the 3D printer.
前颅底重建是一项复杂的外科手术，需要对患者的病情进行仔细评估，并需要技术精湛的外科团队的专业技术。颅底重建的目标主要是在颅内和颅外内容物之间实现无缝分离，封闭死腔，恢复合理的形态和功能。关于重建方案，主要分为非血管移植、局部区域皮瓣、游离组织转移或无骨皮瓣。重建手术面临的主要挑战是，由于缺损边缘不平整和前颅底的构形，如何有效密封缺损。鉴于这一挑战，我们正在考虑利用 3D 打印机为前颅底缺损设计假体的可能性。
{"title":"Applications of 3D Printed Biomaterials in Reconstructive Surgery of the Anterior SkullB","authors":"A. Meius, Cătălina Voiosu, I. Ioniță, A. Rusescu, Oana Ruxandra Alius, Cristina Aura Panea, V. Zainea, R. Hainăroșie","doi":"10.37358/mp.24.1.5701","DOIUrl":"https://doi.org/10.37358/mp.24.1.5701","url":null,"abstract":"\u0000Anterior skull base reconstruction is a complex surgical procedure that requires careful evaluation of the patient s condition and the expertise of a skilled surgical team. Skull base reconstruction objectives focus on providing water-tight separation between the intracranial and extracranial contents, closing dead space, and returning reasonable form and function. Regarding the reconstruction options, the main categories are non-vascular grafts, loco-regional flaps, free tissue transfer or bony-free flaps. The major challenge in reconstructive surgery is the effective sealing of the defect due to its uneven edges and the conformation of the anterior skull base. Given this challenge, we are considering the possibility of designing a prosthetic for anterior skull base defects using the 3D printer.\u0000","PeriodicalId":18360,"journal":{"name":"Materiale Plastice","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140759078","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：