【摘要】 以过氧化氢为引发剂,加入巯基乙醇或丙烯酸羟乙酯,合成了四种不同官能度的端羟基丁二烯-丙烯腈共聚物。以异佛尔酮二异氰酸酯为固化剂,N,N’-二羟丙基苯胺为链延伸剂,制得一系列多嵌段聚氨酯弹性体,研究了平均官能度对固化反应速度及固化物力学性能、动态力学性能、热性能和耐油性能的影响规律。更多还原

【Abstract】 Hydroxy-terminated butadiene-acrylonitryle copolymer （HTBN） was synthesized by usingH₂O₂ as initiator. Four samples of HTBN with, f_n= 1.94, 2.32,2.64 and 3.02, respectively,were prepared by adding HOCH₂CH₂SH or 2-hydroxyethyl acrylate during polymerization.Isophorone diisocyanate （IPDI） was used as curing agent and N,N’-bis（hydroxypropyl）aniline （Isonol C-100）as chain extender.The results showed that the curing rate is dependent on f_n, the higher the f_n, the fas-ter the rate. The crosslinking density of the cured rubber increascs with increasing f_n, sho-wing influence on the properties of the rubber. The tensile strength and hardness increase withincreasing f_n, with the elongation being decreased.HTBN elastomer with f_n = 1.93 is found to be a promising damping material due to theconstant tanδ over a wide temperature range. Two transition temperatures were observed forall HTBN rubbers studied. Increase off f_n is of benefit to the oil- and heat resistance of thecured rubber.更多还原