KINETIC MODEL FOR PREPARING HYDROXY TERMINATEDPOLYDIMETHYLSILOXANE IN ONE-STEP PROCESS

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

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KINETIC MODEL FOR PREPARING HYDROXY TERMINATEDPOLYDIMETHYLSILOXANE IN ONE-STEP PROCESS

更新时间：2025-12-10

- KINETIC MODEL FOR PREPARING HYDROXY TERMINATEDPOLYDIMETHYLSILOXANE IN ONE-STEP PROCESS
- CIESC Journal Issue 1, Pages: 48-53(2004)
- 作者机构：
  
  浙江大学化学工程与生物工程学系高分子工程研究所,浙江,杭州,310027
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 January 2004，
  
  Published：25 January 2004
- 稿件说明：
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ZHOU An’an, WENG Zhixue, SHAN Guorong, et al. KINETIC MODEL FOR PREPARING HYDROXY TERMINATEDPOLYDIMETHYLSILOXANE IN ONE-STEP PROCESS[J]. CIESC Journal, 2004, (1): 48-53.
DOI：

ZHOU An’an, WENG Zhixue, SHAN Guorong, et al. KINETIC MODEL FOR PREPARING HYDROXY TERMINATEDPOLYDIMETHYLSILOXANE IN ONE-STEP PROCESS[J]. CIESC Journal, 2004, (1): 48-53. DOI：

摘要

以四甲基氢氧化铵为引发剂，八甲基环四硅氧烷为单体，水为封端剂，在改进的工艺条件下，一步制得羟基聚硅氧烷.并采用凝胶色谱（GPC）研究上述一步合成法的动力学.在经典的环硅氧烷阴离子开环聚合理论基础上，结合水对反应的影响，提出一步合成法的反应机理并推导了反应动力学模型.同时应用该模型定量计算出活性中心浓度，发现活性中心浓度随反应分迟滞期、增长期、恒定期3个阶段.而不同反应阶段活性中心络合结构的红外光谱 (FT-IR) 检测证实了上述结论.

Abstract

Hydroxy terminated polydimethylsiloxane (PDMS) is one of the important silicone products. In this paper

PDMS was synthesized in one-step process with cyclosiloxanes as monomer and a base as initiator when the reaction was under the conditions of high temperature

adding water and oxygen-off. The kinetics of the reaction was studied by Gel Permeation Chromatography (GPC). Furthermore

from the reaction conditions of one-step process

the chemical features of such one-step process could be expressed as anionic ring-opening polymerization of cyclosiloxanes under the influence of water. So based on the classical mechanism study on anionic ring-opening polymerization of cyclosiloxanes

the reaction mechanism of such one-step process was proposed

the kinetic model of the one-step process was derived. The change of the concentration of active centers with the progress of reaction was quantitatively obtained according to the kinetic model. There are three periods:sluggish period

increasing period

and constant period. The results described above were also verified by examining the complex structure of the reaction mixture with infrared spectroscopy(IR).

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