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Journal of Research Updates in Polymer Science最新文献

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Fatigue and Failure Analysis of Sandwich Composites using Two Types of Cross-Ply Glass Fibers Laminates and Epoxy Resin 两种交叉层合玻璃纤维和环氧树脂夹层复合材料的疲劳失效分析
Journal of Research Updates in Polymer Science Pub Date : 2022-12-16 DOI: 10.6000/1929-5995.2022.11.06
João Pedro Monteiro Cheloni, M. Silveira, Éder Sócrates Najar Lopes, Leandro José da Silva
{"title":"Fatigue and Failure Analysis of Sandwich Composites using Two Types of Cross-Ply Glass Fibers Laminates and Epoxy Resin","authors":"João Pedro Monteiro Cheloni, M. Silveira, Éder Sócrates Najar Lopes, Leandro José da Silva","doi":"10.6000/1929-5995.2022.11.06","DOIUrl":"https://doi.org/10.6000/1929-5995.2022.11.06","url":null,"abstract":"Sandwich structures have become effective structural elements for engineering applications due to their good design flexibility. Understanding the material behavior under static and dynamic loads, as well as the failure mechanisms of these sandwich structures, is of great importance. This work evaluates the fatigue and static bending behavior of epoxy resin specimens and sandwich composites composed of an epoxy resin core with glass fiber laminated faces. The fatigue life, failure modes, and stiffness degradation of these specimens are determined experimentally. The specimens were cycled under constant amplitude and monitored by a data acquisition system that allowed continuous data collection. Three stages of failure were identified using microscope analyses and stiffness degradation curves. In the case of an imposed displacement of 2 mm, the sandwich structures were shown to have a significantly lower fatigue life than the epoxy resin specimens.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83613795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The Influence of Density on the Mechanical Response of Reinforced High-Density Polyurethane Foams: A Statistical Approach 密度对增强高密度聚氨酯泡沫力学响应的影响:一种统计方法
Journal of Research Updates in Polymer Science Pub Date : 2022-10-14 DOI: 10.6000/1929-5995.2022.11.05
E. F. Kerche, J. A. da Cruz, S. Amico
{"title":"The Influence of Density on the Mechanical Response of Reinforced High-Density Polyurethane Foams: A Statistical Approach","authors":"E. F. Kerche, J. A. da Cruz, S. Amico","doi":"10.6000/1929-5995.2022.11.05","DOIUrl":"https://doi.org/10.6000/1929-5995.2022.11.05","url":null,"abstract":"In this work, rigid polyurethane foams (RPUF) reinforced by micro fibrillated cellulose (MFC) were manufactured using the free rising method and also under confinement inside a closed mould, aiming to increase apparent density and improve mechanical response. Neat RPUF were also manufactured for comparison. The mechanical response, evaluated by compression (following ASTM D1621 standard) tests were correlated with the final composite apparent density (evaluated following ASTM D1622 standard). Simple linear regression statistical models, based on F-test, were developed using stat graphics software, aiming to understand and correlate the increment in density and its influence on the improvement in mechanical response. Different models were developed to describe the foam behavior. The main results show a more significant influence of the density on strength than stiffness for the neat RPUF, unlike the MFC-reinforced RPUF, which presented an opposite response. These effects could be caused by the lower content of voids when the foams were produced under confinement, and by the greater crosslink density, when MFC was added.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81487067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of the use of Renewable Compatibility Agent Wood Plastic Composite (WPC) 再生相容性剂对木塑复合材料(WPC)使用的影响
Journal of Research Updates in Polymer Science Pub Date : 2022-10-12 DOI: 10.6000/1929-5995.2022.11.04
Dielen Marin, L. Chiarello, G. K. Gruber, A. D. de Oliveira, A. A. Reichert, K. P. Vieira, Laercio Ender, V. Wiggers, V. Botton
{"title":"Influence of the use of Renewable Compatibility Agent Wood Plastic Composite (WPC)","authors":"Dielen Marin, L. Chiarello, G. K. Gruber, A. D. de Oliveira, A. A. Reichert, K. P. Vieira, Laercio Ender, V. Wiggers, V. Botton","doi":"10.6000/1929-5995.2022.11.04","DOIUrl":"https://doi.org/10.6000/1929-5995.2022.11.04","url":null,"abstract":"The growing interest in using recycled and natural materials in the application of new composites in recent years implies ecological, economic and versatility benefits. Wood plastic composite (WPC) are considered very attractive materials, as they allow the use of polymers of recycled or virgin origin, associated with forestry by-products. The present work aims to investigate the influence on the mechanical, thermal and morphological resistance of WPC, using oleic acid and glycerol as renewable coupling agents. Composites were also prepared with a commercial compatibility agent in its formulation - maleic anhydride grafted polypropylene (MAPP) - under the same conditions. The composites were prepared in a single-screw extruder, with fixed contents of 5% sawdust with 95% virgin polymer, of this total, 2% were coupling agents: MAPP, oleic acid or glycerol, according to the desired composition. To be evaluated as changes in mechanical properties, tensile and impact strength tests were performed on specimens obtained through the injection molding process. The fracture surfaces of specimens tested in tensile tests were examined using images generated by scanning electron microscopy. The thermal stability of the composites was also investigated by thermogravimetric analysis. The use of glycerol and oleic acid improved the mechanical properties of the composite. An increase in tensile strength is observed when glycerol is added in composite. As for impact strength, the addition of glycerol or oleic acid was around 58% higher in impact strength when compared to without coupling agent. Glycerol and oleic acid are renewable, low-cost alternative to be a potential substitute for the commercial coupling agent MAPP, especially when the main requirement is to obtain better impact resistance properties.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80219738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Cellulose-Based Hydrogels: Patent Analysis 纤维素基水凝胶:专利分析
Journal of Research Updates in Polymer Science Pub Date : 2022-08-25 DOI: 10.6000/1929-5995.2022.11.03
A. Fatimi
{"title":"Cellulose-Based Hydrogels: Patent Analysis","authors":"A. Fatimi","doi":"10.6000/1929-5995.2022.11.03","DOIUrl":"https://doi.org/10.6000/1929-5995.2022.11.03","url":null,"abstract":"Background: Among biopolymers, cellulose and its derivatives are the most commonly used for hydrogel formulations. The innovation and improvement of cellulose-based hydrogels concerned the raw materials, synthesis and methods of preparation, formulations and fabrication processes, as well as applications. \u0000Objectives: This study, in the form of patent analysis, presents the state by introducing what has been innovated and patented concerning cellulose-based hydrogels. \u0000Methods: Three databases have been used in this study: the Patentscope, the Espacenet, and the Lens patent data set. A detailed analysis has been provided regarding publication dates, patent families, jurisdictions, inventors, applicants, owners, and patent classifications. \u0000Results: A total of 8053 patent documents related to cellulose-based hydrogels have been published between 1965 and 2021. The United States leads the patent race in this sector, and the Massachusetts Institute of Technology is one of the top academic applicants. \u0000Conclusion: Based on patent classifications, most patent documents are related to medicinal preparations characterized by special physical forms. More specifically, the classification concerns materials for prostheses or coating prostheses, including cellulose derivatives characterized by their function or physical properties, such as macromolecular gels, hydrogels, or hydrocolloids.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86577137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Novel Methacrylamide Polymers Based on Thiazole and Styrene: A Study on Synthesis, Characterization, and Determination of Monomer Reactivity Ratios 基于噻唑和苯乙烯的新型甲基丙烯酰胺聚合物:合成、表征和单体反应性比测定的研究
Journal of Research Updates in Polymer Science Pub Date : 2022-03-21 DOI: 10.6000/1929-5995.2022.11.02
C. Soykan, Ece Ergül
{"title":"Novel Methacrylamide Polymers Based on Thiazole and Styrene: A Study on Synthesis, Characterization, and Determination of Monomer Reactivity Ratios","authors":"C. Soykan, Ece Ergül","doi":"10.6000/1929-5995.2022.11.02","DOIUrl":"https://doi.org/10.6000/1929-5995.2022.11.02","url":null,"abstract":"In this study, firstly, a thiazole methacrylamide (TMAAm) monomer was synthesized from methacryloyl chloride with 2-aminothiazole. Later on, a series of copolymers of 2-thiazole methacrylamide (TMAAm) with styrene (St) using strange compositions in the feed has been prepared in solution via radical at 70 oC with AIBN as initiator. The structure of the copolymers was elucidated by FT-IR, 1H-NMR, and 13C-NMR spectroscopy methods. The compositions of the copolymers were determined from the nitrogen (N) difference according to the elemental analysis results. Monomer reactivity ratios; The rTMAAm and rSt, Fineman-Ross (FR), Kelen-Tüdös (KT) linear methods, and the error method model in non-linear variables were calculated with the computer program RREVM. The molecular weights and heterogeneity indices of the copolymers were determined by the GPC method. The thermal stability of the copolymers was investigated by thermogravimetry (TG) measurements.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84740906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Perspectives of Electricity Storage in Polymer Capacitors 聚合物电容器的蓄电展望
Journal of Research Updates in Polymer Science Pub Date : 2021-12-30 DOI: 10.6000/1929-5995.2021.10.12
D. Dudić
{"title":"Perspectives of Electricity Storage in Polymer Capacitors","authors":"D. Dudić","doi":"10.6000/1929-5995.2021.10.12","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.12","url":null,"abstract":"The price and environmental aspects of electricity storage significantly affect the application of green technologies. The electrochemical batteries are currently the best choice for storing electricity for most industrial needs and products. Polymer capacitors show very low energy density compared to conventional batteries and therefore cannot be widely used for electricity disposal. At the same time, all other features of polymer capacitors that characterize battery systems are ideal. After a brief comparison of the basic properties of electrochemical and physical batteries, this paper presents the influence of electron trapping on the energy density of a polyethylene capacitor. The presented results indicate that the phenomenon of electron trapping in polymers can increase the energy deposit of polymer capacitors.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85125701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microencapsulation of Paraffin Wax in Melamine-Formaldehyde for use in Thermal Management Study 三聚氰胺甲醛中石蜡微胶囊化热管理研究
Journal of Research Updates in Polymer Science Pub Date : 2021-12-09 DOI: 10.6000/1929-5995.2021.10.10
S. Pawar, C. Suryanarayana, A. Samui
{"title":"Microencapsulation of Paraffin Wax in Melamine-Formaldehyde for use in Thermal Management Study","authors":"S. Pawar, C. Suryanarayana, A. Samui","doi":"10.6000/1929-5995.2021.10.10","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.10","url":null,"abstract":"Melamine formaldehyde microcapsules containing paraffin wax as phase change material (PCM) were synthesized. Free space was generated in-situ inside microcapsules. These were characterized by FTIR Spectrophotometer, Scanning electron microscope (SEM), Differential Scanning colorimeter (DSC), and optical microscope. It was confirmed that PCM was successfully encapsulated inside the shell material. Encapsulated PCM showed good phase change properties during heating and cooling. Enthalpy value of about 100 J/g was observed. The shape of the microcapsule, showing rough morphology is expected to help during processing and crystallization. It has been experimentally confirmed that no leakage occurs during the melting of PCM. Effectiveness in temperature control in a hot environment was also found to be satisfactory.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77954673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cellulose Ether-Based Liquid Crystal Materials: Review Article 纤维素醚基液晶材料综述
Journal of Research Updates in Polymer Science Pub Date : 2021-11-29 DOI: 10.6000/1929-5995.2021.10.9
A. Basta, V. Lotfy, J. Micky, A. Salem
{"title":"Cellulose Ether-Based Liquid Crystal Materials: Review Article","authors":"A. Basta, V. Lotfy, J. Micky, A. Salem","doi":"10.6000/1929-5995.2021.10.9","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.9","url":null,"abstract":"The development of liquid crystal materials via nanotechnology has become an interesting subject of research in optical material chemistry. One of the significant nanomaterials is cellulose-based nanoparticles. In this review article, we highlighted the classification of liquid crystal materials (LCs), and types of cellulose-NPs and their characterization as LCs materials. Finally, we present our promising data on the synergistic effect of cellulose-NPs on liquid crystal behavior of ethyl cellulose- and hydroxypropyl cellulose- nanocomposites.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77267731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evidence of Chemical Reaction in Binary Blends of Polycarbonate and a Semi-Flexible Liquid Crystal Polymer 聚碳酸酯与半柔性液晶聚合物二元共混物化学反应的证据
Journal of Research Updates in Polymer Science Pub Date : 2021-07-19 DOI: 10.6000/1929-5995.2021.10.8
H. Hakemi
{"title":"Evidence of Chemical Reaction in Binary Blends of Polycarbonate and a Semi-Flexible Liquid Crystal Polymer","authors":"H. Hakemi","doi":"10.6000/1929-5995.2021.10.8","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.8","url":null,"abstract":"In this study, we provide the experimental results of the binary blends of a semi-flexible nematic liquid crystal polymer (LCP1) and polycarbonate (PC) within their phase diagram. The LCP1/PC blends were investigated by Differential Scanning Calorimetry (DSC), Optical Microscopy (OM), Wide-angle X-Ray Diffraction (WXRD), Fourier Transfer Infrared (FTIR), Gel Permeation Chromatography (GPC), and Nuclear Magnetic Resonance (NMR) techniques and observed the evidence of chemical reaction between LCP1 and PC in their heat-treated blends possibly by transesterification mechanism.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76059950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis and Applications of Polymeric Reagent p-Substituted Triphenylamine 聚合试剂对取代三苯胺的合成及应用
Journal of Research Updates in Polymer Science Pub Date : 2021-06-08 DOI: 10.6000/1929-5995.2021.10.7
I. Abu-Abdoun
{"title":"Synthesis and Applications of Polymeric Reagent p-Substituted Triphenylamine","authors":"I. Abu-Abdoun","doi":"10.6000/1929-5995.2021.10.7","DOIUrl":"https://doi.org/10.6000/1929-5995.2021.10.7","url":null,"abstract":"Chemical modification of chloromethylstyrene - styrene copolymer throughout reaction of p-substituted carboxylic acid group of bis-(4,4`-dibromo)-4``-triphenylamine carboxylic acid with the chloromethyl group attached to a phenyl group was carried out on soluble copolymer and polymeric cross-linked copolymer. Chemical oxidation of the neutral p-substituted triphenylamine with antimony pentachloride in dichloromethane solvent gives the corresponding cation - radical salt with the counter ion antimony hexachloride (SbCl6-). The isolated deep blue color cation radical salt is soluble or in insoluble (resin) form in the copolymer was used as a thermal cationic initiator for the polymerization of epoxy and vinyl monomers at room temperature. The cation radical resin showed good activity and stability compared to the soluble polymeric cation radical, both can initiate the cationic polymerization of cyclohexene oxide and N-vinylcarbazole in dichloromethane at room temperature.","PeriodicalId":16998,"journal":{"name":"Journal of Research Updates in Polymer Science","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81463505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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