SYNTHESIS OF POLYDIMETHYLSILOXANES IN THE MAIN CHAIN CONTAINING CYCLOTRISILAZANE

FAN Zhaodong; XIE Zemin

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SYNTHESIS OF POLYDIMETHYLSILOXANES IN THE MAIN CHAIN CONTAINING CYCLOTRISILAZANE

Research Article | 更新时间：2021-03-19

- SYNTHESIS OF POLYDIMETHYLSILOXANES IN THE MAIN CHAIN CONTAINING CYCLOTRISILAZANE
- Acta Polymerica Sinica Issue 6, Pages: 704-708(1999)
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- Published：20 December 1999，
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FAN Zhaodong, XIE Zemin. SYNTHESIS OF POLYDIMETHYLSILOXANES IN THE MAIN CHAIN CONTAINING CYCLOTRISILAZANE. [J]. Acta Polymerica Sinica (6):704-708(1999)
DOI：

FAN Zhaodong, XIE Zemin. SYNTHESIS OF POLYDIMETHYLSILOXANES IN THE MAIN CHAIN CONTAINING CYCLOTRISILAZANE. [J]. Acta Polymerica Sinica (6):704-708(1999) DOI：

摘要

在极性溶剂中合成了六苯基环三硅氮烷锂盐（Ｐ３ＮＬｉ）．在促进剂的作用下

此锂盐成功地引发了环硅氧烷的开环聚合．通过对聚合物的含氮量、１Ｈ-ＮＭＲ、２９Ｓｉ-ＮＭＲ谱的测试

结果证明所得到的聚合物中含有六苯基环三硅氮烷

并研究了聚合物的分子量（ＧＰＣ）与特性粘数的关系．

Abstract

Although the catalytic activity of hexaphenylcyclo-trisilazane trilithium salt is much lower than that of hexamethylcylotrisilazane trilithium salt due to the inductive and steric effect of phenyl group

the thermal and hydrolytic stability of hexaphenylcyclo-trisilazane is much higher than that of hexamethylcyclotrisilazane. By using a polar solvent

such as 1

4-dioxane

etc.

hexaphenylcyclo-trisilazane trilithium salt is prepared through the reaction of hexaphenylcycoltrisilazane and n-BuLi at low temperature. Ring-opening polymerization of cyclosioloxane using hexaphenylcyclotrisilazane trilithium salt as a catalyst and THF

Diglyme of DMSO as a promoter is carried out. The polymer is characterized by 1H-NMR

29Si-NMr

GPC limiting viscosity number measurement. Nitrogen content of the polymer is determined by means of coulometric titration. It is confirmed hat the polymer contains hexaphenylclotrisilazane. The relation between the weight-average molecular weight and the limiting viscosity number of the polymer has been studied.

关键词

六苯基环三硅氮烷锂盐阴离子聚合聚硅氧烷

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