【摘要】 用动态力学方法(DMA)研究了4种酸酐固化环氧树脂基体及一种拉挤环氧/玻璃纤维复合材料,力学损耗曲线上的损耗峰对应温度为材料的玻璃化温度Tg,弹性模量曲线上的切线玻璃化温度为材料的短时使用耐热温度Tu,弹性模量开始明显下降处为材料的长期使用耐热温度Tr。结果表明,DMA测量环氧树脂基体及其复合材料的玻璃化温度Tg具有很高的灵敏度,ΔTg<1℃;通过Tg可以比较不同环氧树脂基体及改性树脂配方的耐热性,确定最佳树脂配比,评价复合材料的耐热性;根据复合材料试样两次动态力学试验扫描得到的ΔTg可以评价复合材料的制造工艺;根据Tu、Tr可以进一步评价环氧树脂基体及其复合材料的耐热性,为具体用途初选合适的耐热配方。更多还原

【Abstract】 Four sorts of anhydride-cured epoxy resin matrix and one sort of pultrusion EP/GF composite were studied by dynamic mechanical analysis(DMA).Glass transition temperature(Tg) was accurately detected at loss peak,tangent glass transition temperatures being set-out from the storage moduli cruve is regarded as Tu,the point where storage modulus begins to decrease is regarded as Tr.The results show that Tg measured by DMA is accurate(ΔTg<1℃) and can be used to compare the high-temperature performance of different epoxy resin matrix,to conform the optimal ratio of resin and to evaluate the high-temperature performance of epoxy resin matrix and its’composite.Diffence of Tg between two DMA scans is used to evaluate the process of composite manutacture.High-temperature performance of epoxy resin matrix and its’composite is particularly evaluated according to Tu and Tr,which is significative to choose appropriate matrix for given application.更多还原