Preparation of degradable material by copolymerization between CO2 and propylene oxide using zinc gultarate supported on silylated-MCM-41
硅烷化改性MCM-41负载戊二酸锌催化CO2与环氧丙烷共聚制备可降解材料

Mesoporous molecular sieve MCM-41 was modified by using trimethylchlorosilane(TMCS)as a silanized agent,and TMCS-MCM-41 supported zinc glutarate catalyst(ZnGA/TMCS-MCM-41)was prepared and characterized by low temperature nitrogen adsorption-desorption technique,Fourier-transform infrared spectroscopy and X-ray diffraction.The results indicated that TMCS functional group was successfully grafted to the surface of the molecular sieve forming the silanized MCM-41 supports with slightly smaller surface area but the frameworks of the molecular sieve were not destroyed.ZnGA can be highly dispersed on the surface of supporters at small size during loading.Much higher catalytic efficiency and faster reaction rate were acquired in copolymerization of CO2 and propylene oxide(PO)by the catalyzed of ZnGA/TMCS-MCM-41 system than pure ZnGA,with catalytic efficiency at 86.3 g polymers per gram ZnGA after 34 hours reaction.More than 95.8% of carbonate content of poly propylene carbonate(PPC)copolymers was confirmed by structural analysis via infrared spectroscopy and 1HNMR.