透明多孔聚合物凝胶的微乳液合成研究

对甲基丙烯酸甲酯(MMA)-丙烯酸丁酯(BA)进行反相及双连续相微乳液共聚合,结果表明,以丙烯酸取代正戊醇作为助乳化剂可以得到透明的聚合物凝胶,其中水相质量分数为20%和40%的微乳液,稳定聚合所要求的丙烯酸/油相最小质量比分别为0 75和0 91。而且,研究发现KMnO4-H2C2O4是双连续微乳液聚合的高效引发体系,反相微乳液聚合则可采用偶氮二异丁睛(AIBN)等油溶性引发剂。ESEM的观测表明,反相微乳液聚合所得透明聚合物凝胶具有闭孔结构,双连续微乳液聚合则得到开孔结构的透明聚合物凝胶。

Study on Preparation of Transparent Microporous Polymer Gels from Microemulsion Polymerization

Polymerization in inverse and bicontinuous microemulsions containing methyl methacrylate and butyl acrylate was studied.Transparent polymer gels could be obtained from microemulsion polymerization with acrylic acid as cosurfactant rather than n-pentanol.Minimum mass ratio of acrylic acid to acrylates required in initial microemulsions containing 20% and 40% aqueous phase were 075 and 091,respectively.KMnO4-H2C2O4 was efficient to initiate bicontinuous microemulsion polymerization and transparent porous polymer gels could be formed quite fast under proper conditions.Ordinary oil-soluble initiator such as AIBN(2,2-azo-bis-iso-butyrnitrile)could be adopted in inverse microemulsion polymerization.According to ESEM examination,polymer gels obtained from inverse microemulsion polymerization exhibited a close-cell microstructure,while those from bicontinuous microemulsion polymerization showed an open-cell microstructure.