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.
出处
《辐射研究与辐射工艺学报》
CAS
CSCD
北大核心
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
关键词
立构规整度
辐射聚合物
聚合温度
Tacticity
Activation parameters
Radiation polymerization
Triethyltin methacrylate
^(13)C-NMR
Spin-spin coupling constant
