聚甲基丙烯酸锡酯的NMR研究——Ⅰ.高分辨^(13)C-NMR谱归属和聚合物立构规整度

NMR Studies on Poly(tri-alkyltin methacrylate)s——Ⅰ. Carbon-13 NMR Spectra Assignments & the tacticity

本文研究的样品是由自由基溶液聚合而成的聚甲基丙烯酸锡酯系列,对其^(13)C-NMR谱进行了详细的归属,并且定量研究了样品在CDCl_3溶液中的空间构型。结果表明,样品的空间立构以间规立构为主,随着取代基极性的减弱和体积的增大,间规立构的含量相应减少。

Samples studied are poly(tri-alkyltin methacrylate)s polymerized by radical polymerization. The Carbon-13 NMR spectra of the polymers were assigned, and the sequence distribution of the polymers in CDCl_3 was calculated, the results indicated that the polymers are syndiotactic-rich and the syndiotacticity decreases with the decreases of the polarity and the increases of the space of the substituents.