PREPARATION OF POLY （LACTIC ACID） THROUGH THIONYL CHLORIDE ACTIVATED POLYCONDENSATION-中国期刊网

摘要 Atwo-stepprocesswasusedtosynthesizethehighmolecularweightpoly(lacticacid)usingthionylchlorideasanactivatorforthepolycondensationofprepolymeroflacticacid.TheproductswerecharacterizedbyGPC,DSCand1H-NMR.Poly(L-lacticacid)(PLLA)withmolecularweightMw:32875wasobtainedwhenthionylchloridewasused.whilelowmolecularweightPLLAMW:7350wasyieldedwithoutthionylchloride.Effectsoftheconcentrationofthionylchloride,polymerizationtimeandbasesonthemolecularweightofpoly(lacticacid)wereinvestigated.InDSCscanstheglasstransitiontemperatures(Tg)oftheresultingpolymersvariedfrom25.3to57.6℃.andtheTgofpoly(L-lacticacid)washigherthanthatofpoly(D,L0lacticacid)(PDLLA).Themeltingpointsofpoly(L-lacticacid)andpoly(D,L-lacticacid)couldnotbefoundunlessthepolymerswereobtainedbythionylchlorideactivator.

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PREPARATION OF POLY （LACTIC ACID） THROUGH THIONYL CHLORIDE ACTIVATED POLYCONDENSATION

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PREPARATION OF POLY （LACTIC ACID） THROUGH THIONYL CHLORIDE ACTIVATED POLYCONDENSATION

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