引发剂对聚醋酸乙烯酯微乳液聚合的影响

Effect of Initiator on Microemulsion Polymerization of Poly(vinyl acetate)

考察了3种引发体系[过硫酸铵-碳酸氢钠（I1），偶氮二异丁腈（I2），过氧化氢-抗坏血酸（I3）]对聚醋酸乙烯酯微乳液聚合的影响。结果表明：I2使微乳液聚合体系反应剧烈；I3反应较为平稳；I1的表现中等。I1～I3所制得的乳液分子量出现典型的双峰分布。在高分子量部分，I3对应的聚合物分子量较高；在低分子量部分，I1～I3差别不大；I2对应的乳胶粒径较小，分布也较窄；I3次之；I1对应的乳胶粒径较大，分布也较宽。

Effects of initiation systems[ ammonium persulfate-sodium hydrogen carbonate（ I1 ）, azodiisobutyronitrile（ I2 ） and peroxide-aseorbie acid （ I3 ） ] on mieroemulsion polymerization of poly （ vinyl acetate） were investigated. Experimental results showed that extent of the polymerization exihibited was I3 〉 I1 〉 I2 and the effect on the particle size of latex and distributions were I1 〉 I3 〉 I2.