中空聚合物乳胶粒子的合成与结构控制——(Ⅰ)核层乳胶粒的制备及其影响

Preparation and Structure Control of Hollow Polymer Particles——Synthesis and Effect on the Hollow Structure of the Core Latex

以甲基丙烯酸/丙烯酸酯/苯乙烯为共聚单体,采用多步种子乳液聚合与碱溶胀的方法制备了中空聚合物乳液微球,通过透射电镜（TEM）和激光粒度仪表征了复合乳液的微相形态,着重研究了核层乳胶粒的制备过程及其影响规律,以及对中空聚合物微球结构的影响。结果表明,核层甲基丙烯酸（MAA）用量在10%-30%,乳化剂用量为单体用量的0.8%-1.2%,通过“饥饿”态进料的种子乳液聚合方法可制备粒径均一核层乳胶粒,可用于制备理想结构的中空聚合物微球。

Hollow polymer latex particles containing a hydrophilic core were prepared by seeded emulsion polymerization, followed by stepwise treatment with ammonia, with MAA /BA/MMA/ST as comonomers. The distribution and morphology of latex particles was determined by Malvern laser particle analyzer and TEM. The effects of the monomer feeding rate, emulsifier dosage used, carboxylated monomer and cross-linking agent content on the polymerization stability, core latex size and hollow particles structure were investigated. The results show that the optimum content of acid monomer in the preparation of seed latex panicles is about 20% -40%, emulsifier is about 0.9%- 1.2 % and cross-linking agent is about 0.5 % -1.0 %, and the obtained polymer particles with this condition have an excellent hollow structure.