论文部分内容阅读
以乙酸乙烯酯(VAc)和苯乙烯(St)为单体,十六烷(HD)和聚苯乙烯(PS)为助稳定剂,十二烷基硫酸钠(SDS)为乳化剂,采用种子细乳液聚合法通过不同的加料顺序制备了不同形貌的聚苯乙烯(PS)/聚乙酸乙烯酯(PVAc)复合微球。考察了乳化剂和助稳定剂的用量对聚合稳定性的影响。采用红外光谱(FTIR)、透射电子显微镜(TEM)和热失重分析(TGA)等方法对复合微球进行了表征。结果表明,乳化剂的用量为6.5mM、PS/HD质量比为1/4时,聚合反应稳定。以PVAc为种子可以得到Janus结构的复合微球;以PSt为种子可以得到核壳结构的复合微球。进一步采用溶剂去除PS核和皂化反应将PVAc水解,得到了中空结构的PVA微球和Janus型双亲性PS/PVA微球。
Using vinyl acetate (VAc) and styrene (St) as monomers, cetane (HD) and polystyrene (PS) as costabilizers and sodium dodecyl sulfate (SDS) as emulsifiers, The miniemulsion polymerization method was used to prepare polystyrene (PS) / polyvinyl acetate (PVAc) microspheres with different morphologies by different loading sequences. The effects of emulsifier and costabilizer on the polymerization stability were investigated. The composite microspheres were characterized by infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The results showed that the amount of emulsifier 6.5mM, PS / HD mass ratio of 1/4, the polymerization was stable. The composite microspheres with Janus structure can be obtained by using PVAc as seed and the composite microspheres with core-shell structure can be obtained by using PSt as seed. Further removal of PS nucleus by solvent and saponification reaction hydrolyzed PVAc to obtain hollow microspheres of PVA and Janus-type amphiphilic PS / PVA microspheres.