摘要
以八甲基环四硅氧烷为单体,十二烷基二甲基苄基溴化铵为阳离子型乳化剂,氢氧化钾为催化剂,进行环硅氧烷阳离子乳液聚合;采用凝胶色谱测定聚合产物的转化率。研究了温度、催化剂浓度、乳化剂浓度、搅拌速度及水油比等对聚合速度的影响。较佳的反应条件是:单体质量为整个聚合体系的34,KOH用量为单体质量的1,阳离子型乳化剂用量为单体质量的6.9,反应温度70℃,搅拌速度250r/min。
The cationic polymerization of cyclosiloxane in aqueous emulsion was perfected with octameth-ylcyclotetrasiloxane （D4） as monomer, dodecyl dimethyl benzyl bromide （DBDA） as cationic emulsifying agent and KOH as catalyst. The conversion of synthesized polymer was examined by Gel Permeation Chromatography （GPC）. Then, the effect of temperature, catalyst concentration, emulsifying agent concentration, stir rate and water/oil ratio on polymerization rate were investigated in details. The reaction conditions were as follows： the amount of the monomer is 34% of the total polymerization system, the KOH amount is 1% of the monomer, the amount of cationic emulsifier is 6. 9% of the monomer, and with reaction temperature of 70 and stirring speed of 250 r / min.
出处
《有机硅材料》
CAS
2008年第6期349-352,共4页
Silicone Material
基金
浙江省自然科学基金项目(Y406306)
关键词
环硅氧烷
阳离子型乳液聚合
动力学
octamethylcyclotetrasiloxane, cationic emulsion polymerization
