Lipase-catalyzed synthesis and characterization of biodegradable polyester containing l-malic acid unit in solvent system
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. ¹H-nuclear magnetic resonance spectroscopy indicated that the selectivity of Novozym 435 was unaffected by changes in the organic media...
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Published in | Journal of applied polymer science Vol. 120; no. 2; pp. 1114 - 1120 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Hoboken
Wiley Subscription Services, Inc., A Wiley Company
15.04.2011
Wiley Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | 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. ¹H-nuclear magnetic resonance spectroscopy indicated that the selectivity of Novozym 435 was unaffected by changes in the organic media. The molecular weight (Mw) 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 Mw 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 Mw 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. |
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Bibliography: | http://dx.doi.org/10.1002/app.33257 Human Resource Training Project for Regional Innovation istex:85DD90D0E9BD79038B12850F765F428386EDDDDF National Space Laboratory (NSL) Program - No. S1 08A01003210 ark:/67375/WNG-63ZFQ6PP-6 World Class University (WCU) Program, Ministry of Education, Science and Technology (MEST) - No. R31-20029 ArticleID:APP33257 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0021-8995 1097-4628 1097-4628 |
DOI: | 10.1002/app.33257 |