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Lipase‐catalyzed synthesis and characterization of biodegradable polyester containing l ‐malic acid unit in solvent system
Author(s) -
Yao Dahu,
Li Guangji,
Kuila Tapas,
Li Peng,
Kim Nam Hoon,
Kim SeongIl,
Lee Joong Hee
Publication year - 2010
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33257
Subject(s) - adipic acid , malic acid , polyester , lipase , condensation polymer , solvent , polymer chemistry , copolymer , thermal stability , catalysis , solubility , chemistry , nuclear chemistry , organic chemistry , materials science , polymer , citric acid , enzyme
Lipase‐catalyzed direct polycondensation of L ‐malic acid ( L ‐MA), adipic acid, and 1,8‐octanediol in organic media was achieved using Novozym 435 as the biocatalyst. 1 H‐nuclear magnetic resonance spectroscopy indicated that the selectivity of Novozym 435 was unaffected by changes in the organic media. The molecular weight ( M w ) of the copolymers was affected by the L ‐MA feed ratio in the diacids, hydrophobicity of the solvent, and solubility of the substrates in the solvents. The M w reached a maximum of 17.4 kDa at 80°C in isooctane at a L ‐MA feed ratio in the diacids of 40 mol %. The M w increased from 3.2 to 16.6 kDa when the reaction time was extended from 6 to 48 hr at 70°C, and remained relatively constant with further increases in reaction time from 48 to 72 hr. The hydrophilicity, thermal stability, and crystallizability of the copolymer were also investigated. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011