材料科学与工程学报2025，Vol.43Issue(6)：887-896,10.DOI:10.14136/j.cnki.issn1673-2812.2025.06.003
聚硅氧烷改性环氧树脂热老化性能
Thermal Aging Properties of Polysiloxane-modified Epoxy Resin
摘要
Abstract
To systematically investigate the regulation mechanism of polysiloxane on the thermal aging behavior of epoxy resin systems and their impact on the long-term thermal stability of materials,thereby providing a theoretical foundation for developing high-performance heat-resistant epoxy composites,hydroxyl-terminated phenyl propyl siloxane(Z6018)was employed to modify epoxy resin(EP),yielding the modified resin EB.Both unmodified EP and modified EB cured samples were subjected to thermal aging at 145℃and 185℃for 30 days.The mechanical properties,chemical structure evolution,and thermal degradation behavior of the aged samples were comprehensively characterized via Fourier transform infrared spectroscopy(FTIR),cast specimen tensile testing,and scanning electron microscopy(SEM).Results demonstrated that siloxane modification enhanced the toughness and thermal resistance of the resin.Although polysiloxane incorporation slightly reduced the initial decomposition temperature(T5%)of EB,it significantly decreased the maximum thermal decomposition rate(MLRmax)by 32.3%in air and increased the char residue at 800℃by 1416.7%,attributed to the formation of a protective char layer that effectively inhibited oxygen permeation and heat transfer,thereby delaying bulk material degradation.After 30 days of aging at 145℃,EB exhibited a 31%increase in tensile strength,while its mechanical stability at 185℃aging markedly surpassed that of EP.The fracture elongation of EB increased by 29%before aging,81%after 145℃aging,and 10%after 185℃aging compared to EP,indicating that flexible siloxane segments improved intrinsic toughness.The enhanced thermal stability of EB was attributed to the high bond energy of Si-O bonds and the thermally insulating char layer.FTIR analysis revealed that thermo-oxidative aging primarily induced chain scission and oxidation reactions in both systems,with EB showing suppressed oxidative degradation due to the inherent stability of siloxane structures.Molecular architecture design,particularly the integration of siloxane components,can significantly improve the performance stability of epoxy resins under high-temperature service conditions.The findings provide critical insights for advancing heat-resistant composite materials in aerospace,electronic packaging,and other demanding applications.关键词
环氧树脂/聚硅氧烷/改性/热老化/耐热性Key words
Epoxy resin/Polysiloxane/Modification/Thermal aging/Heat resistance分类
化学化工引用本文复制引用
冀运东,陶天新,余彧,王静南,曹东风,黄端平..聚硅氧烷改性环氧树脂热老化性能[J].材料科学与工程学报,2025,43(6):887-896,10.基金项目
国家重点研发计划项目(2024YFF0508403) （2024YFF0508403）
国家自然科学基金项目(52273080,12302481) （52273080,12302481）
