STUDY ON THE MECHANISM OF D1ENE POLYMERIZATION BASED ON THE RARE EARTH CATALYSTS WITH 13C-NMR

GONG Zhi; XIE De-min; WANG Fo-song

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STUDY ON THE MECHANISM OF D1ENE POLYMERIZATION BASED ON THE RARE EARTH CATALYSTS WITH 13C-NMR

Research Article | 更新时间：2021-03-19

- STUDY ON THE MECHANISM OF D1ENE POLYMERIZATION BASED ON THE RARE EARTH CATALYSTS WITH 13C-NMR
- Acta Polymerica Sinica Issue 3, Pages: 166-170(1988)
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- Published：20 June 1988，
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GONG Zhi, XIE De-min, WANG Fo-song. STUDY ON THE MECHANISM OF D1ENE POLYMERIZATION BASED ON THE RARE EARTH CATALYSTS WITH 13C-NMR. [J]. Acta Polymerica Sinica (3):166-170(1988)
DOI：

GONG Zhi, XIE De-min, WANG Fo-song. STUDY ON THE MECHANISM OF D1ENE POLYMERIZATION BASED ON THE RARE EARTH CATALYSTS WITH 13C-NMR. [J]. Acta Polymerica Sinica (3):166-170(1988) DOI：

摘要

用13C-NMR 方法测定了稀土顺丁二烯和聚异戊二烯链端结构及序列结构

从链端结构推测的聚合活性链端结构与前文是一致的。在聚异戊二烯中存在着“头-头”和“尾-尾”结构

这种结构引起活性链端甲基位置的改变

从而解释了稀土异戊二烯中3

4-链节的形成。测定了不同聚合温度对聚合物中顺、反结构含量的影响

可用活性链端的 anti-syn异构化加以解释。

Abstract

The structures of polybutadiene and polyisoprene obtained by NdCl3-C2H5OH-AlEt3 catalyst have been investigated with 13C-NMR method. According to the data of chemical shift

the configuration of terminal η3-allylit growing chain is predominated by "tail-to-head" linkage. The temperature of polymerization may change cis-1

4 polymer content. This can be explained by isomerization between anti- and syn-η3-allyl. Since there is a small amount of "head-head" and "tail-tail" linkages in the polyisoprene

4-unit formation in the polyisoprene can be realized.

关键词

13C核磁共振双烯聚合机理稀土催化剂

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