Preparation of hemispherical particles by cleavage of micrometer-sized, spherical poly(methyl methacrylate)/polystyrene composite particle with Janus structure: effect of molecular weight
Preparation of hemispherical particles by cleavage of micrometer-sized, spherical poly(methyl methacrylate)/polystyrene composite particle with Janus structure: effect of molecular weight
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DOI：
10.1007/s00396-013-3120-9
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发表时间：
2014-03
影响因子：
2.4
通讯作者：
Nobuko Yamashita;Tomoe Yamagami;M. Okubo
中科院分区：
文献类型：
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作者：
Nobuko Yamashita;Tomoe Yamagami;M. Okubo
通过丙酮/水溶液处理，将球形Janus聚甲基丙烯酸甲酯(PMMA)/聚苯乙烯（PS）复合颗粒裂解，制备出微米大小的半球形聚合物颗粒。将预先分散在十二烷基硫酸钠水溶液中的均相PMMA/PS/甲苯液滴缓慢蒸发制备出原始PMMA/PS复合颗粒。适当分子量的PMMA和PS是Janus复合颗粒发生解理的必要条件，从而形成PMMA和PS半球形颗粒。解理取决于丙酮/水溶液的组成，这可以通过选择性溶剂吸收到聚合物相中来解释。结果有力地支持了先前提出的Janus复合聚合物颗粒的解理机制。
Micrometer-sized, hemispherical polymer particles were prepared as a result of cleavage of spherical Janus poly(methyl methacrylate) (PMMA)/polystyrene (PS) composite particle by treating particles with acetone/water solutions. The original PMMA/PS composite particles were prepared by the slow evaporation of toluene from homogeneous PMMA/PS/toluene droplets dispersed in aqueous solution of sodium dodecyl sulfate in advance. Appropriate molecular weights of PMMA and PS were necessary for occurrence of the cleavage of the Janus composite particle, resulting in PMMA and PS hemispherical particles. The cleavage depended on the composition of the acetone/water solution, which was explained by selective solvent absorption into the polymer phases. The results strongly support the cleavage mechanism of Janus composite polymer particles that had been proposed earlier.