摘要
采用动态热机械分析法(DMA法),研究不同固化工艺下固化的3221环氧树脂体系/高强玻璃纤维复合材料的干态玻璃化温度Tg,相对刚度E′以及分别在50℃和70℃去离子水中浸泡384 h后,材料的湿态Tg、E′、吸水率的变化规律。结果表明:固化温度较高的样品干态Tg较高,但经湿态处理后,Tg下降的幅度较大。固化温度高的样品在水浸泡过程中吸湿较慢。材料吸水后E′下降。
In this investigation, the epoxy system 3221/RH glass fabric laminates were cured in different cure cycles. The influence of the curing processes on composites＇ glass transition temperature （Tg） and relative stiffness （E＇） were investigated using dynamic mechanical analyze （DMA）. The coupons were immersed in the distilled water at different temperatures, then Tg, E＇ were tested for the immersed coupons. The results show that the coupons with higher crosslink density achieve higher Tg, but exhibit a larger reduction in Tg after immersion in comparison to those with lower crosslink density. Generally, Tg and E＇ of all coupons are reduced distinctly after immersion. For the coupons with the same curing cycle, E＇ is higher at 70 ℃ immersion than at 50 ℃ immersion. This arises from further cure reaction in the epoxy system when the coupons underwent immersion at 70 ℃.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2007年第2期45-49,共5页
Polymer Materials Science & Engineering
关键词
复合材料
固化制度
玻璃化温度
相对刚度
吸水率
composites
curing cycle
glass transition temperature
relative stiffness
absorption
