摘要
以过硫酸铵(APS)为引发剂,对丙烯酸甲酯(MA)的乳液聚合进行了研究,得出在MA/H2O重量比为0.5时,60℃下合成粒径分布均匀的聚丙烯酸甲酯(PMA)种子乳液的最佳配方为:十二烷基硫酸钠(SDS)、(APS)和(NaHCO3)的浓度分别为11.6、1.72和4.69mmol/L.然后以PMA乳液为种子,以油溶性偶氮二异丁腈(AIBA)为引发剂,分别进行不溶胀与溶胀条件下醋酸乙烯酯(VA)的种子乳液聚合,并以磷钨酸为染色剂。
Polymethyl acrylate(PMA) latex particle with narrow diameter distribution was first prepared by batch process with ammonium persulfate as initiator,then the two-stage emulsion polymerization of vinyl acetate(VA) onto PMA were carried out by using oilsoluble initiator 2,2'-azobisisobutyronitrile(AIBN) under unswelling and swelling conditions at 60 ℃ for 8 h.The ratio of polymer to water is 1/2 completed conversion,and the ratios of monomer to seed polymer are varied for all polymerizations.Particle size and morphologies were characterized by TEM with phosphotungstic acid(PTA) as dying agent.Results showed that experimental particle size and Np value are consistent with the theoretical Value for all of seeded emulsion polymerizations,and interpenetrating network particle morphologies were observed under unswelling or swelling conditions at different ratios of PMA to VA.In a conclusion,initiation and polymerization of VA mainly occurred in PMA seed particle swelled with VA, and homonucleation of VA in water is less important.
出处
《山东大学学报(自然科学版)》
CSCD
1999年第2期187-191,共5页
Journal of Shandong University(Natural Science Edition)
基金
国家自然科学基金
关键词
种子乳液聚合
胶粒形态
丙烯酸甲酯
醋酸乙烯酯
seeded emulsion polymerization
particle morphology
oil-soluble initiator