新型含磷阻燃潜固化剂固化环氧树脂单包配方的热分解动力学研究

IF 1.7 4区 工程技术 Q4 POLYMER SCIENCE
J. Kamalipour, M. H. Beheshty, M. J. Zohuriaan-Mehr
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引用次数: 0

摘要

摘要以4,4-二氨基二苯基砜(DDS)和4,4-二氨基二苯基甲烷(DDM)为原料,设计了几种含磷阻燃潜固化剂,与双氰胺(Dicy)一起固化环氧树脂。详细研究了固化单填料体系的热分解和动力学。在氮气气氛下,用热重分析法研究了不同升温速率下的环氧树脂体系。采用Flynn-Wall-Ozawa、Kissinger-Akahira-Sunose和Starink方法对热分解动力学进行了评价。上述三种方法得到的所有系统的相关系数几乎等于1,表明三种方法的选择是正确的。结果表明:不同含磷的DDS-和ddm -衍生固化剂在较低转化率下共混,其活化能随着固化剂的加入而降低,而在较高转化率下则升高。根据得到的活化能,通过三种动力学方法计算了所研究体系的热力学参数ΔH*, ΔG*和ΔS*。结果表明,随着转化率和焓的增加,吉布斯自由能减小,熵由负值变为正值。关键词:环氧树脂阻燃剂双氰胺flynn - wall - ozawakissinger - akahira - sunosestarink热力学参数披露声明作者未报告潜在利益冲突。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal decomposition kinetic study on one-pack formulations of epoxy resin cured with novel phosphorus-containing flame retardant latent curing agents
AbstractSeveral phosphorous-containing flame retardant latent curing agents newly derived from 4,4-diamino diphenyl sulfone (DDS) and 4,4-diamino diphenyl methane (DDM) were designed to cure epoxy resin alongside dicyandiamide (Dicy). The thermal decomposition and kinetics of cured one-packed systems were investigated in detail. The epoxy systems were studied under a nitrogen atmosphere by using thermal gravimetric analysis at different heating rates. The kinetics of thermal decomposition was evaluated by Flynn-Wall-Ozawa, Kissinger-Akahira-Sunose, and Starink methods. The correlation coefficient for all systems obtained by the three above methods was almost equal to one, indicating that these three methods were correctly chosen. The results demonstrated that the activation energy of epoxy/Dicy blended with different phosphorous-containing DDS- and DDM-derived curing agents at a lower degree of conversion decreased by incorporation of the agents while increasing at a higher degree of conversion. The thermodynamic parameters (ΔH*, ΔG*, and ΔS*) of the studied systems were calculated by the obtained activation energy via three kinetics methods. It was found that as the conversion degree and the enthalpy increased, the Gibbs free energy decreased, while entropy changed from negative to positive values.Keywords: Epoxy resinflame retardantdicyandiamideFlynn-Wall-OzawaKissinger-Akahira-SunoseStarinkthermodynamic parameters Disclosure statementNo potential conflict of interest was reported by the author(s).
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来源期刊
CiteScore
3.50
自引率
5.30%
发文量
37
审稿时长
1.6 months
期刊介绍: The scope of the journal is to publish original contributions and reviews on studies, methodologies, instrumentation, and applications involving the analysis and characterization of polymers and polymeric-based materials, including synthetic polymers, blends, composites, fibers, coatings, supramolecular structures, polysaccharides, and biopolymers. The Journal will accept papers and review articles on the following topics and research areas involving fundamental and applied studies of polymer analysis and characterization: Characterization and analysis of new and existing polymers and polymeric-based materials. Design and evaluation of analytical instrumentation and physical testing equipment. Determination of molecular weight, size, conformation, branching, cross-linking, chemical structure, and sequence distribution. Using separation, spectroscopic, and scattering techniques. Surface characterization of polymeric materials. Measurement of solution and bulk properties and behavior of polymers. Studies involving structure-property-processing relationships, and polymer aging. Analysis of oligomeric materials. Analysis of polymer additives and decomposition products.
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