Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (2): 91-94.     Next Articles

Original Articles


刘维俊1,2, 黄永民1, 刘洪来*,1   

  1. (1结构可控先进功能材料及其制备教育部重点实验室 华东理工大学化学系 上海 200237)
    (2上海应用技术学院化工系 上海 200235)
  • 收稿日期:2006-06-20 修回日期:2006-08-20 出版日期:2007-01-28 发布日期:2007-01-28
  • 通讯作者: 刘洪来

Preparation and Characterization of Temperature and pH Respon-sive Core-Shell Microgel

LIU Wei-Jun1,2; HUANG Yong-Min1; LIU Hong-Lai*,1   

  1. (1 Laboratory for Advanced Material, Department of Chemistry, East China University of Science and Technology, Shanghai 200237)
    (2 Department of Chemical Engineering, Shanghai Institute of Technology, Shanghai 200235)
  • Received:2006-06-20 Revised:2006-08-20 Online:2007-01-28 Published:2007-01-28
  • Contact: LIU Hong-Lai

The core-shell p(NIPAM-MAA) microgel was prepared by two-stage process of surfactant-free emulsion polymerization. The first procedure was a reaction of N-isopropylmethacylamide with N,N-methylenebisacrylamide for 3 h in order to obtain seed latexes. In the second stage, the functional monomer MAA was added in the emulsion to sequentially polymerize for 2 h. The objective of this stage was to produce the surface shell layer of microgel. The shape and conformation of gel were determined by transmission electron micrograph and Fourier transform infrared spectroscopy. The temperature- and pH- responsive behaviors were characterized by measuring the diameter of the microgel in aqueous dispersion at different temperature and pH with dynamic light scattering method. Meanwhile, the Zeta potential of microgel was also determined. The results indicated that the morphology of microgel is remarkable core-corona particles. The Zeta potential of microgel particles was related to the size change with temperature and pH.

Key words: N-isopropylmethacylamide, microgel, temperature sensitive, core-corona particle