华南理工大学学报(自然科学版) ›› 2013, Vol. 41 ›› Issue (7): 75-80,93.doi: 10.3969/j.issn.1000-565X.2013.07.013

• 化学化工 • 上一篇    下一篇

阳离子细乳液聚合制备官能化聚硅氧烷

万小芳 黄春柳 李友明 柴欣生 胡会超   

  1. 华南理工大学 制浆造纸工程国家重点实验室,广东 广州 510640
  • 收稿日期:2012-11-30 修回日期:2013-01-30 出版日期:2013-07-25 发布日期:2013-06-01
  • 通信作者: 万小芳(1970-),女,博士,高级工程师,主要从事有机硅细乳液、造纸化学品应用基础研究. E-mail:wanxf@scut.edu.cn
  • 作者简介:万小芳(1970-),女,博士,高级工程师,主要从事有机硅细乳液、造纸化学品应用基础研究.
  • 基金资助:

    国家自然科学基金资助项目(20776055)

Preparation of Functional Polysiloxane via Cationic Miniemulsion Polymerization

Wan Xiao- fang Huang Chun- liu Li You- ming Chai Xin- sheng Hu Hui- chao   

  1. State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2012-11-30 Revised:2013-01-30 Online:2013-07-25 Published:2013-06-01
  • Contact: 万小芳(1970-),女,博士,高级工程师,主要从事有机硅细乳液、造纸化学品应用基础研究. E-mail:wanxf@scut.edu.cn
  • About author:万小芳(1970-),女,博士,高级工程师,主要从事有机硅细乳液、造纸化学品应用基础研究.
  • Supported by:

    国家自然科学基金资助项目(20776055)

摘要: 采用阳离子细乳液聚合,以八甲基环四硅氧烷( D4 ) 为原料、十二烷基苯磺酸( DBSA) 为催化剂、乙烯基二甲基乙氧基硅烷( EDEV) 为封端剂制备分子链端含双键的聚硅氧烷中间体,以进一步合成疏水性能更好的硅丙乳液.考察了聚合温度、DBSA 用量、封端剂种类、EDEV 用量及EDEV 加入时间对 D4 单体转化率、产品粒径及其多分散指数( PDI) 的影响.结果表明: 聚合温度85 ℃、DBSA 用量6%、EDEV 用量 1.0%、聚合反应开始后3 h 加入EDEV 可得到粒径为95.3nm、PDI 为 0.123 的稳定有机硅细乳液聚合产品,单体转化率达92.1%; FT- IR 分析表明封端剂有效地参与了细乳液聚合反应; TEM 测试表明聚合物粒子为纳米结构.文中还建立了主要工艺参数对 D4  阳离子细乳液聚合制备官能化聚硅氧烷的转化率影响的预测模型.

关键词: 阳离子细乳液聚合, 八甲基环四硅氧烷, 十二烷基苯磺酸, 封端剂, 单体转化率, 预测模型

Abstract:

In order to synthesize silicone- acrylate emulsion with stronger hydrophobicity,polydimethylsiloxane endedwith vinyl terminal groups was synthesized via the cationic miniemulsion polymerization of octamethylcyclotetrasiloxane(D4 ) monomer,with dodecylbenzene sulfonic acid (DBSA) as the catalyst and with ethenylethoxydimethyl silane(EDEV) as the blocking agent.Then,the effects of polymerization temperature,DBSA dosage,blocking agenttype,EDEV dosage and EDEV addition time on the monomer conversion rate,the latex particle radius and thepolydispersity index (PDI) were investigated.The results indicate that stable polymerization product of siliconeminiemulsion,which is of a radius of 95.3nm,a PDI of 0.123 and a monomer conversion rate of 92.1%,can beobtained via the polymerization at 85 ℃,with a DBSA dosage of 6%,an EDEV dosage of 1.0% and an EDEVaddition time of 3h.FT- IR results show that the blocking agent effectively takes part in the miniemulsion polymeri-zation.TEM analysis indicates that the product is in a nano- structure.Moreover,a model is proposed to predict the D4 conversion rate of functional polysiloxane varying with the main technological parameters.

Key words: cationic miniemulsion polymerization, octamethylcyclotetrasiloxane, dodecyl benzenesulfonic acid, blocking agent, monomer conversion rate, prediction model

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