共轭双烯与丙烯酸甲酯交替共聚物的~(13)C-NMR谱研究

用~(13)C-NMR方法研究了丁二烯(BD)-丙烯酸甲酯(MA)、异戊二烯(IP)-MA和氯丁二烯(CP)-MA交替共聚物(分别简称为PBM、PIM和PCM)的联接方式和微观结构。在PBM中,BD单元以反-1,4-结构存在,并有少量的顺-1,4-和1,2-结构,其比例为88:7:5;在PIM和PCM中,IP与CP单元也主要以反-1,4-结构存在,与MA以“头-头”方式相连接。在PCM中还有少量CP-CP相连接的结构,交替度较低,而PBM和PIM则完全是交替结构。

STUDIES ON THE 13C-NMR SPECTRA OF ALTERNATING COPOLYMERS OF CONJUGATED DIENES WITH METHYL ACRYLATE

The 13C-NMR, spectra of alternating copolymers of conjugated dienes, e.g. butadi-ene(BD), isoprene(IP) and chloroprene(CP), with methyl acrylate(MA) were studied. It was proved that they are all alternating copolymers. The BD units in poly(BD-a-Ma) are mainly in the form of trans-1,4-structure. The contents of trans-1,4-, cis-1,4- and 1, 2-structure are 88, 7 and 5%, respectively. The IP and OP units in poly(IP-a-MA) and poly(CP-a-MA) are present essentially in trans-1, 4-configuration and link with MA units predominantly in the "head to head"arrangement while CP-CP units pre-sent in the latter with a small quantity.