作者：8. Binyuan Liu*, Yang Li, Boo-Gyo Shin, Do Yeung Yoon, IL Kim, Li Zhang, Weidong Yan
关键字：functional polynorbornenes
论文来源：期刊
具体来源：J Polym Sci, Part A: Polym Chem, 2007, 45,3391-3399
发表时间：2007年

Three novel functionalized polynorbornenes (PNB) with pendant dimethyl
carboxylate group (carboxylates—acetate, propionate, and butyrate) are synthesized as a vinyl-type with a palladium (II) catalyst in high yield. The effects of size of substitutents, molar ratio of monomer to catalyst, solvent polarity, reaction time, and temperature on the polymerization of exo-norbornene dimethyl propionate were systematically investigated. The low molar ratio and temperature, as well as high polarity of solvent, and long reaction time, are favorable for the enhancement of the monomer conversion, especially, the solvent have an obvious effect on the catalyst activity. The resulting poly(cis-norbornene-exo-2,3-dimethyl carboxylates) (PNB-dimethyl carboxylates) show good solubility in common organic solvent and high thermal stability up to 360 8C. The glass transition temperature was detected by DMA at 331, 324, and 318 oC for acetate, propionate, and butyrate, respectively