亚微米中空微球聚合物的制备及其形貌调控

采用乳液聚合协同碱渗透溶胀法，制备了亚微米中空微球聚合物。通过SEM、TEM、DLS分别对中空微球的形貌和粒径进行表征，并考察了中空微球聚合物的遮盖性能。研究了引发剂用量对核粒径的影响，中间层和壳层聚合物配比对微球形貌结构及其遮盖性能的影响。结果表明，在核制备过程中，核的粒径随引发剂用量的增加而减小；对于平均粒径为148 nm的核，当中间层甲基丙烯酸丁酯（BMA）用量为10 wt%、甲基丙烯酸（MAA）用量为3 wt%，甲基丙烯酸甲酯（MMA）用量为87 wt%，壳层苯乙烯（St）用量为97 wt%，交联剂用量为3 wt%时，可制备平均粒径414 nm，中空率为40.6 %的聚合物微球，且微球表面较为光滑，此时中空微球聚合物具有优异遮盖性能，遮盖度达到66 %。

Preparation and Morphology Control of Submicro-Hollow Microsphere Polymer

The submicro-hollow microsphere polymer were prepared by emulsion polymerization and alkali swelling. The morphology and particle size of the hollow microspheres were characterized by SEM, TEM and DLS. And the covering performance of hollow microsphere polymer emulsion was tested. The effects of the initiator amount on the particle size of the core, the interlayer and shell component on the morphology of the hollow microsphere polymer were investigated. The results showed that the core particle size decreased with the increasing initiator amount. For the core with an average particle size of 148 nm, surface-smooth hollow microsphere polymer with an average particle size of 414 nm and a hollow rate of 40.6 % was prepared with the amount of BMA, MAA and MMA in interlayer was 10 wt%, 3 wt% and 87 wt% respectively, and the amount of St, crosslink agent in shell was 97 wt% and 3 wt% respectively. The as-synthesized hollow microsphere polymer exhibited excellent covering performance of 66 %.