New development in preparation of non-spherical polymer particles

采用乳液聚合和种子聚合法制备了多种非球形聚合物颗粒。其中，在半球形（Janus）聚甲基丙烯酸甲酯(PMMA)/聚[苯乙烯-2-（2-溴异丁基氧基）甲基丙烯酸乙酯][P(S-BIEM)]复合颗粒存在下，采用种子原子转移自由基聚合（ATRP）法制备了2-（二甲氨基）甲基丙烯酸乙酯（DM）的“蘑菇”状聚合物颗粒。得到的复合颗粒具有双面形形貌：PDM层仅在P（S-BIEM）相表面。我们还证明了PMMA/P(S-BIEM)-g-PDM Janus颗粒对pH和温度具有双重响应性。

We succeeded in preparing various non-spherical polymer particles by emulsion and seeded polymerization. Among these particles, “mushroom”-like polymer particles were prepared by seeded Atom Transfer Radical Polymerizaion（ATRP）of 2-(dimethylamino)ethyl methacrylate (DM) in the presence of hemispherical (“Janus”) poly(methyl methacrylate) (PMMA)/poly[styrene-2-(2-bromoisobutyryloxy)ethyl methacrylate] [P(S-BIEM)] composite particles in an aqueous dispersed system. The obtained composite particles had a Janus morphology: PDM layer only on the surface of P(S-BIEM) phase. We also demonstrated that PMMA/P(S-BIEM)-g-PDM Janus particles exhibit dual responsiveness to pH and temperature.