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以含缩醛官能团的有机锂为引发剂,将甲基丙烯酸甲酯(MMA)与含氟硅氧烷单体1,3,5-三甲基-1,3,5-三(3′,3′,3′-三氟丙基)环三硅氧烷(F3)阴离子嵌段共聚,获得了窄分子量分布的聚甲基丙烯酸甲酯-b-聚[甲基(3,3,3-三氟丙基)硅氧烷](PMMA-b-PMTFPS)嵌段共聚物,并用GPC,1H NMR,FTIR和DSC对嵌段共聚物进行了表征.研究结果表明,在THF中利用PMMA-OLi对F3进行阴离子开环聚合时,单体F3浓度的选择对提高嵌段共聚物产率至关重要.
Using organolithium containing acetal functional group as initiator, methyl methacrylate (MMA) and fluorosilicone monomer 1,3,5-trimethyl-1,3,5-tris (3 ’ 3 ’, 3’-trifluoropropyl) cyclotrisiloxane (F3) was obtained by anionic block copolymerization to obtain a narrow molecular weight distribution of polymethylmethacrylate-b-poly [methyl (PMMA-b-PMTFPS) block copolymer was synthesized and characterized by GPC, 1H NMR, FTIR and DSC.The results showed that the block copolymers were characterized by PMMA-OLi In the anionic ring-opening polymerization of F3, the choice of the monomer F3 concentration is crucial for increasing the yield of the block copolymer.