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LIU Wen-Ming, ZHAO Ling-Chong, XIAO Qing, LI Feng-Yi. Synthesis of Polylactide by Direct Condensation Polymerization Catalyzed by SO42-/TiO2-Ce4+[J]. Chinese Journal of Applied Chemistry,
;2006, 23(12): 1350-1354.
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Solid superacid catalyst SO42-/TiO2-Ce4+ was prepared by two-phase precipitation,and preparation conditions for the catalyst suitable for the synthesis of poly(lactic acid) through condesation of lactic acid monomer were studied.The optimum preparation conditions for the catalyst were 1.0 mol/L of H2SO4,0.08 mol/L of Ce4+,immersion time 10 h,and 3 h calcination at 500℃.The above catalyst was used in the synthesis of poly(lactic acid) through condesation.The effect of reaction temperature,reaction time,reaction pressure and catalyst amount on the condesation of lactic acid was studied.The optimum reaction conditions were obtained,which were the amount of catalyst 0.174% vs lactic acid,prepolymerization for 5 h at 120℃ and 2 000 Pa,then polymerization for 15 h at 180℃ and 1 000 Pa,and last polymerization for 20 h at 120℃ and 500 Pa.The viscosity average molecular weight of the poly(lactic acid) was 1.39×104.
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