Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (5): 126-131.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Effect of Emulsifier on Kinetics and Nucleation Mechanism of Semi -Continuous Emulsion Polymerization

Sun Zhi-juan  Zhang Xin-ya  Jiang Qing-mei  Huang Hong  Chen Huan-qin   

  1. Research Institute of Chemical Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2006-05-19 Online:2007-05-25 Published:2007-05-25
  • Contact: 孙志娟(1980-) ，女，博士生，主要从事丙烯酸酯乳液和树脂的成研究. E-mail:sunzj77@163.com
  • About author:孙志娟(1980-) ，女，博士生，主要从事丙烯酸酯乳液和树脂的成研究.
  • Supported by:

    广东省科技计划项目( 2003B10506 )

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Abstract:

Acrylate emulsions were prepared hy means of semi -continuous emulsion polymerization , and the influence of emulsifier concentration [E] on the polymeric kinetics and nucleation mechanism was investigated. Then , the evolvement of particle size distrihution with [E] in the whole polymerization process was analyzed. Experimental results show that the polymerization rate Rp ∝[E]1.28 and the nucleation mechanism of the system is "micellar nucleation" when [E] is more than 0.01 mollL , whereas Rp ∝[E]0.17 and the main nucleation mechanism is "homogeneous nucleation" when [E] is less than 0. 01 mol/L. Furthermore , the particle size distribution of emulsions in the whole polymerization process proves that the nucleation mechanism varies with the value of [E].

Key words: emulsion polymerization, micellar nucleation, homogeneous nucleation, emulsifier, polymerization rate, particle size distrihution