Effect of colloidal stabilizer on the shape of polystyrene/poly(methyl methacrylate) composite particles prepared in aqueous medium by the solvent evaporation method
Effect of colloidal stabilizer on the shape of polystyrene/poly(methyl methacrylate) composite particles prepared in aqueous medium by the solvent evaporation method
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DOI：
10.1021/la061298v
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发表时间：
2006-10-24
期刊：
影响因子：
3.9
通讯作者：
Okubo, Masayoshi
中科院分区：
文献类型：
--
作者：
Saito, Naohiko;Kagari, Yoshimi;Okubo, Masayoshi
研究了稳定剂种类和浓度对聚苯乙烯（PS）/聚甲基丙烯酸甲酯（PMMA）复合粒子非球形形貌的影响。在聚（乙烯醇）的情况下，所获得的颗粒的表面总是有一个单一的酒窝。在十二烷基硫酸钠（SDS）的情况下，随着SDS浓度的增加，复合粒子的形状从酒窝，通过橡实，球形的变化。结果表明，聚苯乙烯/聚甲基丙烯酸甲酯复合粒子的韧窝状和橡子状是由于聚甲基丙烯酸甲酯相在甲苯蒸发过程中发生相分离而形成的偏心核壳状和半球状粒子，在固化后PS相发生收缩而形成的。
Effects of the kind and concentration of stabilizers on the nonspherical shape of polystyrene (PS)/poly(methyl methacrylate) (PMMA) composite particles prepared by release of toluene from PS/PMMA/toluene droplets dispersed in stabilizer aqueous solution were examined. In the case of poly(vinyl alcohol), the surfaces of the obtained particles always had a single dimple. In the case of sodium dodecyl sulfate (SDS), the shapes of the composite particles changed from the dimple, via acorn, to spherical with increasing SDS concentration. It was clarified that the dimple and acorn shapes of the PS/PMMA composite particles were caused by contraction of the PS phase after hardening of the PMMA phase in excentered core-shell and hemisphere morphologies, respectively, which were formed by phase separation during toluene evaporation.