论文部分内容阅读
乳液聚氯丁二稀的微观结构与聚合条件有关.本文通过红外光谱、核磁共振波谱测定,考察了硫调型氯丁橡胶微观结构与聚合转化率之间的关系.结果表明,随着单体转化率的提高,聚合物中反式-1,4-结构含量减少,而顺式-1,4-、1,2-及3.4-结构含量增多。同时.1,4-结构中的头-头、尾-尾联接也增多.即大分子链的规整度下降.剖析日本和国内相应产品表明,国内产品中1.2-结构含量较高,可能与控制聚合转化率较高有关。
The microstructure of emulsion polychloroprene is related to the polymerization conditions.In this paper, the relationship between the microstructure of sulfur-modified neoprene and the polymerization conversion was investigated by means of infrared spectroscopy and nuclear magnetic resonance spectroscopy.The results showed that with the monomer With the increase of conversion rate, the content of trans-1,4-structure in the polymer decreases and the content of cis-1,4-, 1,2- and 3.4-structure increases. At the same time, the head-tail and tail-tail couplings also increased in the 1,4-structure, that is, the regularity of the macromolecular chains decreased.Analysis of the corresponding products in Japan and China showed that the content of 1.2-structure in domestic products is higher than the control Polymerization conversion rate is higher.