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Direct condensation polymerization of lactic acid
Author(s) -
Kim Soo Hyun,
Kim Young Ha
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991440125
Subject(s) - polymerization , lactic acid , condensation , materials science , condensation polymer , polymer chemistry , chemical engineering , chemistry , polymer science , composite material , polymer , thermodynamics , physics , bacteria , engineering , biology , genetics
In order to synthesize the higher molecular weight poly(lactic acids) by direct condensation polymerization of lactic acid, dipentaerythritol was used as a chain branching agent. Poly(lactic acids) of high molecular weight, 67000(Mn), was obtained by using antimony trioxide catalyst with good color. This poly(lactic acids) showed Tg of 54.8 °C, Tm of 147 °C and cold crystallization temperature of 115 °C. The polymer could be melt processed into transparent films. Tensile modulus of 311 Kg/ mm 2 , tensile strain of 21% and tensile strength of 12.41 Kg/ mm 2 were obtained for film collected at 400%/min and drawn 4 times.
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