八甲基环四硅氧烷的乳液离子开环聚合反应  

Emulsion Ionic Ring-Opening Polymerization of Octamethyltetracyclosiloxane

作　　者：林明涛[1,2] 庞久寅[3] 储富祥[1,2] 王春鹏[1,2] 

机构地区：[1]中国林业科学研究院林产化学工业研究所,国家林业局林产化学工程重点开放性实验室,江苏南京210042 [2]中国林业科学研究院林业新技术研究所,北京100091 [3]北华大学交通建筑工程学院,吉林吉林132013

出　　处：《高分子材料科学与工程》2009年第6期20-23,共4页Polymer Materials Science & Engineering

基　　金：国家杰出青年科学基金(30325031);中国林业科学研究院科学技术发展基金(2004-M-08)资助项目

摘　　要：采用乳液离子开环聚合手段制备了聚有机硅氧烷乳液。考察了聚合过程中乳化剂和催化剂的种类、用量对八甲基环四硅氧烷(D4)的转化率及聚合过程中粒子大小变化的影响,并用气相色谱、气相色谱-质谱联用手段分析了聚合过程中单体及副产物含量的变化情况。实验结果表明,当使用非离子型乳化剂时,D4不能开环聚合;而当使用离子型乳化剂时,可有效实现开环聚合;不同类型的乳化剂和催化剂呈现不同的聚合特点;在D4的阴、阳离子催化开环聚合过程中,均发生back-biting现象,但后者更为显著。Polysiloxane emulsions were prepared through emulsion ionic ring-opening polymerization. The influence of the kind and amount of surfactant and catalyst was studied by monitoring the evolution of monomer conversion and particle size, and the evolutions of monomer and side products concentration were analyzed by gas chromatograph and gas chromatograph-mass spectrometer. The results show that polysiloxanecan be effectively produced in anionic and cationic surfactant system while D4 can not be polymerized in non-ionic surfactant system. Polymerization is affected significantly by the kind and amount of surfactant and catalyst. It is also found that there has back-biting phenomenon in emulsion ionic ring-opening polymerization, especially in cationic catalyst cases.

关 键 词：乳液聚合 离子开环聚合 聚有机硅氧烷 

分 类 号：TQ316.334[化学工程—高聚物工业]