中文摘要：

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.

英文摘要：

Cross-linked monodisperse polystyrene microspheres were synthesized using one-step method by combining dispersion polymerization with hydrothermal process using styrene as monomer,AIBN as initiator,PVA as stabilizer and ethanol and deionized water as solvent in this paper.The cross-linked monodisperse polystyrene microspheres could be prepared in a large alcohol-water range,even if the crosslinking agent was up to 2 wt%.We focused on the system that the ethanol/water ratio of solvent was fixed at 50/50,to study the effects of stabilizer type and content,organic phase content,initiator concentration and autoclave fill volume on the morphology of the microspheres and size distribution.It was found that the microspheres showed coalescence with decreasing the molecular weight and increasing content of stabilizer.Even without any stabilizers the monodisperse crosslinked PS microspheres could still be prepared when high content crosslink agent was used.The microspheres showed polydispersity gradually with the organic phase increasing.The content of the initiator and the fill volume in the autoclave have little effect on the morphology of the microspheres.And the cause and mechanism of the one-step preparation method of monodisperse crosslinked polystyrene microspheres were also discussed.