物理化学学报 >> 2012, Vol. 28 >> Issue (04): 892-896.doi: 10.3866/PKU.WHXB201202031

软物质 上一篇    下一篇

沉淀聚合制备聚(季戊四醇三丙烯酸酯-苯乙烯)单分散微球及其形成机理

张召1, 顾相伶2, 朱晓丽1, 孔祥正1   

  1. 1. 济南大学化学化工学院, 济南 250022;
    2. 德州学院医学系, 山东德州 253023
  • 收稿日期:2011-10-20 修回日期:2012-01-09 发布日期:2012-03-21
  • 通讯作者: 孔祥正 E-mail:xzkong@ujn.edu.cn
  • 基金资助:

    国家自然科学基金(20874040, 20904016)和山东省自然科学基金(Z2008B07)资助项目

Preparation and Formation Mechanism of Uniform Polymer Microspheres in Precipitation Polymerization of Pentaerythritol Triacrylate and Styrene

ZHANG Zhao1, GU Xiang-Ling2, ZHU Xiao-Li1, KONG Xiang-Zheng1   

  1. 1. School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, P. R. China;
    2. Department of Medicine, Dezhou University, Dezhou 253023, Shandong Province, P. R. China
  • Received:2011-10-20 Revised:2012-01-09 Published:2012-03-21
  • Contact: KONG Xiang-Zheng E-mail:xzkong@ujn.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20874040, 20904016) and Natural Science Foundation of Shandong Province, China (Z2008B07).

摘要: 以季戊四醇三丙烯酸酯(PETA)作交联剂, 苯乙烯作共聚单体, 偶氮二异丁腈作引发剂, 在乙醇或其与水的混合溶剂中沉淀聚合制备了交联聚合物微球. 研究了反应时间、交联剂用量以及溶剂中水含量对聚合过程及微球的影响. 结果表明当PETA用量在单体质量的5%-35%之间且反应时间不低于6 h时可制得单分散聚合物微球. 当PETA用量低于20%时, 所得微球的粒径随PETA用量的增加逐渐减小, 粒径分布逐渐变窄; 此后继续提高PETA用量, 微球粒径又逐渐增大, 粒径分布逐渐变宽. 向反应介质中加入水, 可明显提高微球产率及单体转化率, 但其体积分数达30%时, 所得微球分散性变宽. 在此基础上对微球的形成机理也进行了讨论.

关键词: 单分散微球, 沉淀聚合, 乙醇-水混合溶剂, 季戊四醇三丙烯酸酯, 苯乙烯

Abstract: Uniform polymer microspheres were prepared through precipitation polymerization of pentaerythritol triacrylate (PETA) and styrene in ethanol or an ethanol-water mixture using azobisisobutyronitrile (AIBN) as initiator. The effects of the polymerization time, amount of PETA, and water content in the mixed solvent on the polymerization process and the microspheres were studied. Uniform microspheres were readily obtained when the amount of PETA was between 5% and 35% (mass fraction) relative to all monomers with a polymerization time of 6 h. When the mass fraction of PETA was <20%, the microspheres decreased in size and became more uniform as the PETA mass fraction increased. By contrast, when the PETA mass fraction was >20%, the microspheres size increased and the size distribution became larger as the PETA mass fraction increased. With the ethanol-water binary solvent mixture, the monomer conversion and microsphere yield increased compared with those obtained with pure ethanol. However, the water volume fraction needed to be kept below 30%, above which the uniformity of the microspheres was deteriorated. Based on the results, the mechanism of microsphere formation is discussed.

Key words: Uniform polymer microsphere, Precipitation polymerization, Ethanol-water mixed solvent, Pentaerythritol triacrylate, Styrene

MSC2000: 

  • O648