Yoshida Saki, Kikuchi Shu, Kanehashi Shinji, Okamoto Kazuo, Ogino Kenji
Graduate School of Bio-Applications Systems Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo 184-8588, Japan.
Ushio Chemix Co., Ltd., Kakegawa, Shizuoka 437-1302, Japan.
Materials (Basel). 2018 Apr 10;11(4):582. doi: 10.3390/ma11040582.
Multicomponent polymer particles with specific morphology are promising materials exhibiting novel functionality which cannot be obtained with single-component polymer particles. Particularly, the preparation of such kinds of polymer particles involving electrically or optically active conjugated polymers with uniform size is a challenging subject due to their intense demands. Here, microspheres of binary polymer blend consisting of poly(4-butyltriphenylamine) (PBTPA)/poly(methyl methacrylate) (PMMA) (1:1 in weight) were produced via a microfluidic emulsification with a Y-shaped microreactor, and a subsequent solvent evaporation method. The flow rate of the dispersed phase (polymer solution) was fixed to 7 µL/min, and 140 or 700 µL/min of the flow rate of the continuous phase (aqueous 0.6 wt % of poly(vinyl alcohol) (PVA) solution) was utilized to produce the dispersion with different diameter. The concentration of dispersed phase was adjusted to 0.1 or 1.0 %. Core-shell, Janus and dumbbell type microspheres were obtained dependent on the flow rate of continuous phase. Incomplete core-shell type microspheres were produced for the blend involving low molecular weight PMMA. Complex Janus and core-shell type microspheres were fabricated by the addition of sodium dodecyl sulfate (SDS) to continuous phase. It is found that final morphologies are strongly dependent on the initial conditions of dispersion including the particle size suggesting that the morphologies are governed by the kinetical factors together with the conventionally accepted thermodynamic ones.
具有特定形态的多组分聚合物颗粒是具有新型功能的有前途的材料，而单一组分聚合物颗粒无法获得这些功能。特别地，制备包含尺寸均匀的电活性或光活性共轭聚合物的此类聚合物颗粒是一个具有挑战性的课题，因为它们有严格的要求。在此，通过使用Y形微反应器的微流体乳化和随后的溶剂蒸发方法，制备了由聚（4-丁基三苯胺）（PBTPA）/聚（甲基丙烯酸甲酯）（PMMA）（重量比1:1）组成的二元聚合物共混物的微球。分散相（聚合物溶液）的流速固定为7 μL/min，连续相（0.6 wt%的聚乙烯醇（PVA）水溶液）的流速为140或700 μL/min，用于制备不同直径的分散体。分散相的浓度调整为0.1%或1.0%。根据连续相的流速获得了核壳型、Janus型和哑铃型微球。对于包含低分子量PMMA的共混物，制备了不完全核壳型微球。通过向连续相中添加十二烷基硫酸钠（SDS），制备了复杂的Janus型和核壳型微球。发现最终形态强烈依赖于分散的初始条件，包括粒径，这表明形态是由动力学因素以及传统认可的热力学因素共同控制的。
