应用化学 ›› 2010, Vol. 27 ›› Issue (08): 875-881.DOI: 10.3724/SP.J.1095.2010.90652

• 研究论文 • 上一篇    下一篇

端羟基聚丙烯酸酯改性水性聚氨酯

陈炜,李昊,张炎,许戈文,黄毅萍*   

  1. (安徽大学化学化工学院,安徽省绿色高分子重点实验室 合肥 230039)
  • 收稿日期:2009-10-09 修回日期:2009-12-22 出版日期:2010-08-10 发布日期:2010-08-10
  • 通讯作者: 黄毅萍,男,教授; E-mail:yphuang2001@sina.com; 研究方向:功能高分子材料
  • 基金资助:
    安徽省自然科学基金(070414193)和安徽省重点实验室中青年骨干专项(2007年)资助项目

Waterborne Polyurethane Modified by Hydroxyl-Terminated Polyacrylate

CHEN Wei, LI Hao, ZHANG Yan, XU Ge-Wen, HUANG Yi-Ping*   

  1. (School of Chemistry and Engineering,Key Laboratory of Environment-friendly
    Polymer Materials of Anhui Province,Anhui University,Hefei 230039)
  • Received:2009-10-09 Revised:2009-12-22 Published:2010-08-10 Online:2010-08-10
  • Contact: huang yiping

摘要:

将丙烯酸丁酯(BA)、甲基丙烯酸甲酯(MMA)通过溶液自由基聚合,用巯基乙醇作为链转移剂调控合成了一定分子量的端羟基聚丙烯酸酯(PA),再与聚氨酯(PU)预聚体反应,在水中分散得到PA-PU-PA三嵌段共聚复合乳液。 采用FTIR和1HNMR测试技术对共聚物结构进行了表征。 结果表明,随着PU与PA质量比的降低,共聚物中丙烯酸酯含量随之增加;PU软硬链段之间的氢键化作用减弱。 TEM显示,复合乳胶粒子形态均匀规整,并呈现明显的核壳结构。改性后的乳胶膜耐水、耐热性能均随着PU/PA质量比的减小而提高,吸水率由25%降低至5%,最大热失重温度由369 ℃提高至432 ℃。

关键词: 聚丙烯酸酯, 水性聚氨酯, 改性, 嵌段共聚物

Abstract:

In the presence of mercaptoethanol as chaintransfer agent, hydroxylterminated polyacrylate(PA) with a certain molecular mass was synthesized by solution freeradical polymerization of butyl acrylate(BA) and methyl methacrylate(MMA). The PA-PU-PA hybrid emulsion was obtained by reacting PA with polyurethane(PU) prepolymer in water. FTIR and 1H NMR results of the copolymer chain structure show that when PU/PA mass ratio declined, the acrylic content in the copolymer increased and the role of hydrogen bonds between PU soft and hard segment weakened. The composite particles had homogeneous coreshell structure in TEM photograph. Waterproof and heat resistant performance of the modified latex film were improved with the decrease of PU/PA mass ratio. Water absorption of the modified film dropped from 25% to 5% and the maximum mass loss temperature was increased from 369 ℃ to 432 ℃.

Key words: polyacrylate, aqueous polyurethane, modifying, multi-block copolymerization

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