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Direct synthesis of poly (D,L-lactide-tocopherol) via melt copolycondensation and its characterization

Luo Yu-fen

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Abstract

Using cheap D,L-lactic acid(D,L-LA)as material,and SnO as catalyst,polymeric antioxidant poly(D,L-lactide-tocopherol)is directly synthesized via the melt copolycondensation.The effects of different feed molar ratio are discussed.The synthesized polymeric vitamin E esters are white powder,and have suitable molecular weights.Its all weight-average molecular weight can be higher than 3 200 g/mol.The glass-transition temperature of copolymers can be lower than that of homopolymer poly(D,L-lactic acid)(PDLLA),and the melting temperature(Tm)is similar to that of PDLLA.

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What this paper is about

Using cheap D,L-lactic acid(D,L-LA)as material,and SnO as catalyst,polymeric antioxidant poly(D,L-lactide-tocopherol)is directly synthesized via the melt copolycondensation.The effects of different feed molar ratio are discussed.The synthesized polymeric vitamin E esters are white powder,and have suitable molecular weights.Its all weight-average molecular weight can be higher than 3 200 g/mol.The glass-transition temperature of copolymers can be lower than that of homopolymer poly(D,L-lactic acid)(PDLLA),and the melting temperature(Tm)is similar to that of PDLLA.

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Available abstract

Using cheap D,L-lactic acid(D,L-LA)as material,and SnO as catalyst,polymeric antioxidant poly(D,L-lactide-tocopherol)is directly synthesized via the melt copolycondensation.The effects of different feed molar ratio are discussed.The synthesized polymeric vitamin E esters are white powder,and have suitable molecular weights.Its all weight-average molecular weight can be higher than 3 200 g/mol.The glass-transition temperature of copolymers can be lower than that of homopolymer poly(D,L-lactic acid)(PDLLA),and the melting temperature(Tm)is similar to that of PDLLA.

Key concepts: Lactic acid, Glass transition, Copolymer, Molar ratio, Polymer chemistry, Catalysis, Lactide, Molar mass

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