THERMOREGULATED PHASE TRANSFORMATION AND CATALYTIC PERFORMANCE OF MANGANESE PORPHYRIN GRAFTED TO THE THERMO-SENSITIVE POLYMER

摘要

In the present study, N-vinyl caprolactam monomer having good biocompatibility was used as feedstocks for preparing thermo-sensitive polymers. The preparation of the NVCL-g- chitosan polymer was successfully carried out in our laboratory by a radical solution polymerization of N-vinyl caprolactam and chitosan in 250mL glass bottle, azobisisobutyronitrile being used as an initiator. Water and iso-propanol were used as solvents. The porphyrin manganese with carboxy group grafted onto the NVCL-g-chitosan polymer was prepared and the resulting product behaves a thermo-sensitive property. The following conclusions are obtained. 1) Epoxidation of propylene can be realized in water solution in the presence of H2O2 and porphyrin manganese grafted onto the NVCL-g-chitosan polymer. 2) A suitable reaction of polymerization for preparing the NVCL-g-chitosan polymer is as follows. 6g N- vinylcaprolactam, chitosan /N-vinylcaprolactam 3/1 (wt/wt), 20ml iso-propanol, 15ml water, 0.05g initiator, reaction temperature 65 degree centigrade, reaction time is 8h-12h and mild agitation. 3) The porphyrin manganese grafted onto the NVCL-g- chitosan polymer can be prepared by chemical bonding of groups. The polymer solution was characterized by UV-vis spectrophotometer. Both PNVCL and its graft copolymers behave a thermoresponsive property. Epoxidation of propylene can be realized in water without using micellar solution by use of the objective compound. A phase separation can be made by heating the reaction products. The repeating use of the catalyst can be realized without losing its activity considerably. References