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Anionic non-equilibrium ring-opening polymerization of octamethylcyclotetrasiloxane (D4) initiated by silazyl-lithiums

✍ Scribed by Shunxing Su; Zhijie Zhang; Zhimin Zheng; Zemin Xie

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
100 KB
Volume
53
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

The initiation and propagation reactions in anionic non‐equilibrium polymerization of octamethylcyclotetrasiloxane (D~4~) initiated by silazyl‐lithiums are investigated. It is found that: both the steric hindrance effect and the electronic effect of the substitutes on the Si atom Si influences the initiation activity of silazyl‐lithiums; temperature effect on the propagation rate of D~4~ increases strongly above 40 °C; the molecular weight distribution of the prepared polysiloxanes widens with time.

© 2003 Society of Chemical Industry

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