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

合成了水溶性和可生物降解的聚天冬氨酸衍生物。用表面张力测量、荧光探针法、动态光散射等手段研究了其水溶液的胶体性质，如胶束形成等。结果表明，它们的物质缔合形成了直径从几nm到几十nm的分子间和分子内聚集体。此外，我们还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。成功地制备了球形聚苯乙烯微球。从微球直径对表面活性剂浓度的依赖关系的证据中可以看出，乳液聚合遵循传统的Smith-Ewart机理。从ζ势的角度讨论了所制备的聚苯胶乳的分散性能。

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.