日用化学工业2012，Vol.42Issue(6)：399-404,6.
八甲基环四硅氧烷阳离子开环乳液聚合研究
Study of cationic ring-opening emulsion polymerization of octamethylcyclotetrasiloxane
莫建强 1沈敏敏 2周宝文 1邓莲丽 1张延奎2
作者信息
- 1. 中国科学院广州化学研究所中国科学院纤维素化学重点实验室,广东 广州 510650
- 2. 中国科学院大学,北京100049
- 折叠
摘要
Abstract
Polysiloxane emulsions were prepared by using octamethylcyclotetrasiloxane as monomer, blended surfactant composed of octadecyltrimethylammonium chloride. ( OTAC ) and ethoxylated iso — tridecanol (1307) as emulsifier and KOH as catalyst. Three emulsification methods;high pressure homogenizer,ultrasonic treatment and high speed shearing were carried out to compare the result in aspect of light transmittance, electric conductance, viscosity and storage stability of the emulsion. Effects of mass ratio of the surfactant constituents in the emulsifying agent, dosage of blend emulsifying agent, dosage of KOH catalyst, as well as the reaction temperature on stability of the emulsion and polymerization kinetics were investigated. Results showed that using 30 MPa high pressure homogenizer will result - in best emulsion stability as compared with other methods. When m(OTCA) : m( 1307) =1:1 , the emulsion stability is rather good. Following the increase of emulsifying agent dosage, the fraction of gel content in the emulsion is reduced, and the stability of the emulsion is upgraded. Under the condition as m ( OTCA) : m(l307) = 1: 1 , the apparent reaction order is 0. 16. When the. mass ratio of the blend emulsifier is 3% , the apparent reaction order is 0. 21. The apparent reaction order of KOH catalyst is 0. 57, and its apparent activation energy is 42. 66 kJ ? mol-1.关键词
八甲基环四硅氧烷/复合乳化剂/高压均质/稳定性/动力学Key words
octamethylcyclotetrasiloxane/ blended emulsifier/ high pressure homogenization/ stability/ kinetics分类
化学化工引用本文复制引用
莫建强,沈敏敏,周宝文,邓莲丽,张延奎..八甲基环四硅氧烷阳离子开环乳液聚合研究[J].日用化学工业,2012,42(6):399-404,6.
