CHANGE OF TERMINATED HYDROXY CONCENTRATION IN ANIONIC POLYMERIZATION OF OCTAMETHYLCYCLOTETRASILOXANE IN PRESENCE OF WATER

ZHOU An’an; WENG Zhixue; SHAN Guorong; HUANG Zhiming; PAN Zuren

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CHANGE OF TERMINATED HYDROXY CONCENTRATION IN ANIONIC POLYMERIZATION OF OCTAMETHYLCYCLOTETRASILOXANE IN PRESENCE OF WATER

更新时间：2025-12-10

- CHANGE OF TERMINATED HYDROXY CONCENTRATION IN ANIONIC POLYMERIZATION OF OCTAMETHYLCYCLOTETRASILOXANE IN PRESENCE OF WATER
- CIESC Journal Issue 5, Pages: 850-853(2004)
- 作者机构：
  
  化学工程联合国家重点实验室聚合反应工程实验室，浙江大学化学工程与生物工程学系,浙江,杭州,310027
- 作者简介：
- 基金信息：
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- Online First：25 May 2004，
  
  Published：25 May 2004
- 稿件说明：
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ZHOU An’an, WENG Zhixue, SHAN Guorong, et al. CHANGE OF TERMINATED HYDROXY CONCENTRATION IN ANIONIC POLYMERIZATION OF OCTAMETHYLCYCLOTETRASILOXANE IN PRESENCE OF WATER[J]. CIESC Journal, 2004, (5): 850-853.
DOI：

ZHOU An’an, WENG Zhixue, SHAN Guorong, et al. CHANGE OF TERMINATED HYDROXY CONCENTRATION IN ANIONIC POLYMERIZATION OF OCTAMETHYLCYCLOTETRASILOXANE IN PRESENCE OF WATER[J]. CIESC Journal, 2004, (5): 850-853. DOI：

摘要

Abstract

The anionic polymerization of octamethylcyclotetrasiloxane (D4) catalyzed by tetramethyl ammonium hydroxide (TMAH) in the presence of water under the conditions of high temperature and oxygen-off was investigated. The conversion of polymerization and the molecular mass of the polymer were examined by Gel Permeation Chromatography (GPC). Based on mechanism analysis

the calculation model of terminated hydroxy concentration (cOH) was obtained. And the result of the increase of cOH with conversion was observed by using the model. Then the influence of reaction conditions on the change of the value of cOH with conversion was investigated.The increase of the hydroxy terminated rate was greater than that of the polymerization rate with increasing temperature.The increase of the polymerization rate was greater than that of the hydroxy terminated rate with the concentration of catalyst increasing. With the concentration of water increasing

the polymerization rate decreased and the hydroxy terminated rate increased.

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