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将分散聚合与水热处理相结合,以聚乙烯醇为稳定剂,以乙醇和水为分散介质,三羟甲基丙烷三丙烯酸酯为交联剂,一步法成功制备得到不同粒径的单分散交联聚苯乙烯微球.以乙醇/水的比例为50/50的反应体系为基础,研究了聚乙烯醇类型和含量,有机相含量,引发剂浓度,以及水热釜填充量等对所制备的微球形貌的影响,发现聚乙烯醇类稳定剂的分子量的降低和含量的增多倾向于生成黏连的微球;在有交联剂的条件下,不含稳定剂的体系仍能够得到单分散的交联PS微球;有机相含量的增加会导致微球呈现多分散性;而体系中引发剂的含量和反应液在水热釜中的填充量对微球的形貌影响不大.进一步针对水热法的特点分析探讨了一步法成功制备单分散的交联聚苯乙烯微球的原因及其机理.
The dispersion polymerization and hydrothermal treatment combined with polyvinyl alcohol as a stabilizer, ethanol and water as the dispersion medium, trimethylolpropane triacrylate as a crosslinking agent, one-step successful preparation of monodisperse cross-linked Polystyrene microspheres were prepared on the basis of the reaction system with the ratio of ethanol / water of 50/50. The effects of the type and content of polyvinyl alcohol, the content of organic phase, the concentration of initiator and the filling amount of hydrothermal kettle on the prepared The results showed that the decrease of the molecular weight and the increase of the content of the polyvinyl alcohol-based stabilizer tended to generate the adhered microspheres. In the presence of the crosslinking agent, the system without the stabilizer was still able to obtain Monodisperse cross-linked PS microspheres; the increase of the content of the organic phase will lead to the polydispersity of the microspheres; while the content of the initiator and the loading of the reaction solution in the hydrothermal reactor have little effect on the morphology of the microspheres The characteristics of hydrothermal method were further analyzed to explore the reason and mechanism of one - step successful preparation of monodispersed crosslinked polystyrene microspheres.