Preparation of heteropolyacid ionic liquid catalyst and its catalytic performances for synthesizing degradable polyester PES
In order to analyze the catalytic performances of heteropolyacid ionic liquid catalyst,a functionalized heteropolyacid ionic liquid catalyst([HO-(CH2)2-mim]5[Ti(H2 O)FeMo11 O39])was prepared by ion exchange between the heteropolyacid anion prepared with Fe as the central heteroatom and Mo as the coordination atom and 1-hydroxypropyl-3-methylimidazole salt cation.The FT-IR,UV,XRD and TGA were used to characterize the structure of the catalyst,the process parameters were optimized by orthogonal tests,and the effects of feed ratio,catalyst dosage,temperature and time of transesterification reaction on the catalytic performances of heteropolyacid ionic liquid catalyst were discussed.The experimental results show that the as-proposed catalyst has correct structure,well thermal performance and good catalytic effect.In the optimum process conditions,feed ratio is 2,mass fraction of catalyst is 1.0%,reaction temperature is 220℃and reaction time is 5 h.The PES yield prepared under the optimum condition is 75.32%.
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