Equilibrium anionic ring-opening polymerization of a six-membered cyclosiloxazane

被引：3

作者：

Brochon, Cyril ^{[1
]}

Mingotaud, Anne Francoise ^{[1
]}

Schappacher, Michele ^{[1
]}

Soum, Alain ^{[1
]}

机构：

[1] Univ Bordeaux 1, ENSCPB, UMR, CNRS,Lab Chim Polymeres Organ, F-33607 Pessac, France

来源：

MACROMOLECULES | 2007年 / 40卷 / 10期

关键词：

D O I：

10.1021/ma061708m

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The anionic ring-opening polymerization of heptamethyl-1,3-dioxa-5-aza-2,4,6-trisilacyclohexane, initiated with organolithium compounds, has been investigated. With the addition of dimethylformamide (DMF), the polymerization is controlled. Backbiting reactions are limited and give a unique specific cyclic compound in low proportion. Thermodynamic and kinetic studies indicate that such polymerization is equilibrated. The apparent rate constants of propagation and depolymerization along with the thermodynamic parameters (enthalpy and entropy) of the polymerization have been calculated. The active species are ion pairs externally solvated by DMF in equilibrium with unreactive aggregated ion pairs.

引用

页码：3547 / 3553

页数：7

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