苯乙烯和丙烯腈在聚醚介质中分散共聚合的过程

引言 自20世纪60年代提出分散聚合的概念以来,研究者进行了大量的研究,主要包括成核机理、粒子增长方式、粒子稳定、粒子尺寸分布及控制等[1];特别是90年代后,针对分散聚合制备单分散微米级聚合物微粒子的研究使分散聚合的研究得到了很大的深化, Paine等[2-4] ,Kawaguchi等[5], Prochazka等[6],Lu等[7],Chernyshev等[8],Ahem等[9-10]对分散聚合的机理和动力学过程进行了细致的研究,对聚合过程提出了合理的描述,对控制粒子尺寸及分布提供了有意义的指导.

Process of dispersion copolymerization of styrene and acrylonitrile in polyether

The dispersion copolymerization process of styrene (St) and acrylonitrile (AN) in polyether was studied by dynamic light scattering,liquid chromatography and UV. The results showed that in the process,in appropriate polymerization condition, the nucleation mechanism was dominated by the agglomeration nucleation of graft polymers, and then the stable dispersion system could be prepared.After the nucleation period,the number of particles kept constant and particles swelled by the action of monomers and grew by the polymerization of monomers in the dispersed phase and kept stable by adsorbing graft polymers formed in the continuous phase.