Self-organization of polyaspartate derivatives and their application to polymer colloid preparation

合成了水溶性和生物降解性的聚天冬氨酸衍生物。用表面张力测定、荧光探针技术、动态光散射等方法研究了它们水溶液的胶态性质，如胶束形成等，结果表明，它们的物质缔合形成分子间和分子内聚集体，聚集体的直径从几nm到几十nm不等。采用合成的聚天冬氨酸衍生物作为表面活性剂，进行了苯乙烯的乳液聚合。成功制备了球形聚苯乙烯微球。从微球直径的表面活性剂的浓度依赖性的证据，发现乳液聚合进行了传统的史密斯-Ewart机制。从静电势的角度讨论了所制备的聚苯乙烯乳液的分散性能。

Water-soluble and biodegradable polyaspartate derivatives were synthesized. Colloidal properties of their aqueous solution such as micelle formation were studied by using surface tension measurement, fluorescence probe technique, dynamic light scattering and so on. As a result, it was clarifies that their substances associated to form both inter- and intra-molecular aggregates which diameter ranged from several nm to several tens nm.Furthermore, we adopted the synthesized polyaspartate derivatives as a surfactant and emulsion polymerization of styrene was carried out. Spherical polystyrene microspheres were successfully prepared. From the evidence of surfactant-concentration dependency of microsphere diameter, it was found that emulsion polymerization proceeded following traditional Smith-Ewart mechanism. Dispersion property of polystyrene latex prepared in this study was discussed from the point of view of ζ-potential.