Ishizu Koji, Yasuda Michio, Tamura Toru
Department of Organic Materials and Macromolecules, International Research Center of Macromolecular Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan.
J Colloid Interface Sci. 2003 Nov 15;267(2):320-5. doi: 10.1016/s0021-9797(03)00704-5.
Cross-linked core-shell polymer particles were synthesized by free-radical dispersion copolymerization of 4-vinylpyridine (4VP) and various kinds of cross-linking reagents with methacryloyl-terminated polystyrene (PS) macromonomers in nonaqueous media such as 1,4-dioxane and cyclohexane. Well-defined particles were obtained by copolymerization of 4VP with ethylene glycol dimethacrylate (EGDM) in a dioxane medium. The particle diameters (D(n)=40-990 nm) decreased drastically both with increasing the feed concentration ratio of macromonomer to 4VP, [PS-M]/[4VP], and with increasing molecular weight of PS-M macromonomers. The particle size distribution (D(w)/D(n)) was in the range 1.02-1.10. PS-M macromonomers acted not only as comonomers but also as stabilizers. The particle diameters obtained in dioxane were smaller than those obtained in cyclohexane. Thus, we observed a tendency to smaller particle size as the media became more soluble for PS-M macromonomer.
通过4-乙烯基吡啶（4VP）与各种交联剂以及甲基丙烯酰基封端的聚苯乙烯（PS）大分子单体在1,4-二氧六环和环己烷等非水介质中进行自由基分散共聚，合成了交联核壳聚合物颗粒。在二氧六环介质中通过4VP与乙二醇二甲基丙烯酸酯（EGDM）共聚得到了尺寸明确的颗粒。粒径（D(n)=40 - 990 nm）随着大分子单体与4VP的进料浓度比[PS-M]/[4VP]的增加以及PS-M大分子单体分子量的增加而急剧减小。粒径分布（D(w)/D(n)）在1.02 - 1.10范围内。PS-M大分子单体不仅作为共聚单体，还作为稳定剂。在二氧六环中得到的粒径比在环己烷中得到的粒径小。因此，我们观察到随着介质对PS-M大分子单体的溶解性增强，颗粒尺寸有变小的趋势。
