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《Journal of Chemical Industry and Engineering(China)》 2004-01
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KINETIC MODEL FOR PREPARING HYDROXY TERMINATED POLYDIMETHYLSILOXANE IN ONE-STEP PROCESS

ZHOU An'an, WENG Zhixue, SHAN Guorong, HUANG Zhiming and PAN Zuren (Institute of Polymer Engineering, Department of Chemical and Biochemical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China)  
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).
【Fund】: 教育部高等学校重点实验室访问学者基金资助~~
【CateGory Index】: O643.1
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