摘要
用红外光谱分析了聚氨酯（ＰＵ）／环氧树脂（ＥＰ）共混物体系中的化学反应特征，用差示扫描量热法（ＤＳＣ）分析计算了ＰＵ预聚体分别同扩链剂、交联剂（第Ⅰ类反应），以及同环氧树脂之间反应（第Ⅱ类反应）的动力学参数．结果表明，第Ⅰ类反应和第Ⅱ类反应的活化能分别为３８．３ｋＪ·ｍｏｌ－１和５０．４ｋＪ·ｍｏｌ－１，在１２０℃时的速度常数分别为２．６３ｍｉｎ－１和０．７５ｍｉｎ－１．应用扫描电镜和动态力学性能分析了ＰＵ／ＥＰ共混物之间的形态结构特征，发现在一定组份比时两相间形成了互穿聚合物网络（ＩＰＮ），并存在化学交联，两相组份对共混物形态结构影响较大，讨论了其可能的原因．
he reactions in the polyurethane/epoxy(PU/EP) blends have been studied by FTIR. The reaction kinetics of polyureathane prepolymer with 1,4Butanedol, 1,1,1Trimethylolpropane (reaction Ⅰ) and with epoxy resin (reaction Ⅱ) has been studied by DSC. The activation energy of reaction Ⅰ and reaction Ⅱ is 38.3 kJ·mol-1 and 50.4 kJ·mol-1, the rate constant at 120℃ is 2.63 min-1 and 0.75 min-1 respectively. The influence of component on their morphology, glass transition behavior has been reported. The component is an important factor that affects the interpenetrating degree. The cause of the phenomena is analyzed.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
1997年第4期435-442,共8页
Journal of Shanghai University:Natural Science Edition
关键词
高分子共混物
形态结构
聚氨酯
环氧树脂
polymer blend, reaction kinetics, interpenetrating polymer networks, morphological structure
