聚合温度对甲基丙烯酸三乙基锡酯辐射聚合物立构规整度的影响  

EFFECT OF RADIATION POLYMERIZATION TEMPERATURE ON THE TACTICITY OF POLY (TRIETHYLTIN METHACRYLATE)

作　　者：赵秉熙[1] 田民权[1] 朱清仁[1] 陈道勇[1] 韩哲文[2] 

机构地区：[1]中国科学技术大学 [2]华东化工学院

出　　处：《辐射研究与辐射工艺学报》1992年第1期36-40,共5页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金

摘　　要：本文测定了在0-50℃温度范围内,由^(60)Coγ射线引发聚合的聚甲基丙烯酸三乙基锡酯的立构规整度。用^(13)C-NMR测定聚合物分子链的立构规整度,如预料的那样,以间同立构为主,并随着聚合温度的升高间同立构等规度降低。由实验结果计算出的控制立构规整度的活化能参数是:全同和间同增长的活化焓与活化熵的差值分别为10.2kJ·mol^(-1)和19.8J·k^(-1)mol^(-1)。本文还测定了^(119)Sn与^(13)C原子之间的自旋偶合常数。A series of poly(triethyltin methacrylate) samples have been synthe- rized in tbe range of 0℃ to 50℃ by the radiation. The tacticity of the polymers has been measured by ^(13)C-NMR. The tesults show that the polymers are all predominantly syndiotactic, as exrected, and the tendency to form syndiotactic sequence decreases as the polymerization temperature increases. The resnlt pf the activation rarameters governing the tacticity is that the activation enthalpy and the activation entropy between isotactic and syndiotactic placement are 10.2 kJ·mol^(-1) and 19.8 J·k^(-1)·mol^(-1) Tespectively. The spin-spin coupling constant between ^(119)Sn and ^(13)C has also heen dstermined.

关 键 词：立构规整度 辐射聚合物 聚合温度 

分 类 号：O627.42[理学—有机化学]