摘要
用顺磁共振波谱仪(ESR),以4-羟基-2,2,6,6-四甲基哌啶嗣(TEMPOL)作自旋标记,测定了不同组成及不同温度聚醚聚氨酯/聚甲基丙烯酸甲酯(PU/PMMA)互穿网络聚合物(IPN,S)的分子运动与互穿缠结程度的关系。实验结果表明:在该IPN中两网络互穿缠结程度越大,在高场上出现各向同性温度T_n越高。当PU/PMMA=40/60时,得到较大交联密度和较高温度的T_n。由测得的T_(50G)温度看出该体系是两相分离体系,并且不同组成比的IPN两个T_(50G)温度发生内移,在40/60时内移最大,用动态力学方法测得的结果与此一致。
The molecular motion and interpenetraing extent of Polyurethane/Polymethyl methacrlate (PU/PMMA) interpenetrating Pulymer networks (IPN's) were studied by electron spin resonance (ESR) by using the spin Probe of 4-hydroxy-2,2,6,6-telramethyl piperidine-1-oxyl (TEMPOL). ESR spctra of changing compositon and temperature of the IPN'S were determinated. The results show, the higher the highfield isotropic temperature Tn is, the more the interpenetrating extent is. When PU/PMMA=40/60, crosslink density is 0.46 and Tn is 8℃. The temperature at which this separation is 50G has been correlated with the glass transtion temperature Tg. The major objective in this study is to develop methods for the study of the degree of mixing and molecular motion in IPN.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1991年第3期42-45,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金
关键词
聚氨酯
PU
PMMA
IPM
分子运动
polyurethane, polymethyl methacrylate, interpenetrating polymer network,molecular motion, crosslinking density,
