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Effect of dimethyl sulfoxide on synthesis of thermoplastic cellulose‐ Graft ‐poly( l ‐lactide) copolymer using ionic liquid as reaction media
Author(s) -
Lee Sung Jun,
Lee Hae Sung,
Jeong Sang Won,
Kim HyunChul,
Lee Se Geun,
Oh Tae Hwan
Publication year - 2015
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.41331
Subject(s) - copolymer , dimethyl sulfoxide , ionic liquid , cellulose , polymer chemistry , materials science , lactide , thermoplastic , chemical engineering , organic chemistry , chemistry , catalysis , polymer , composite material , engineering
In this study, ring‐opening graft polymerization of l ‐lactide onto cellulose was carried out homogeneously in ionic liquid (IL)/dimethyl sulfoxide (DMSO) co‐solvent as a reaction media. Through the effective control of high viscosity and steric hindrance caused by the interaction between the IL and the hydroxyl group of cellulose by adding DMSO as a co‐solvent, cellulose‐ graft ‐poly( l ‐lactide) (Cell‐ g ‐PLLA) copolymer with higher substitution efficiency was successfully prepared, at relatively low concentration of l ‐lactide. The maximum values of molar substitution, degree of lactyl substitution, and degree of polymerization of poly( l ‐lactide) in the copolymer were 3.76, 1.74, and 2.16, respectively, determined by 1 H‐NMR. The prepared cell‐ g ‐PLLA copolymers showed thermal plasticization with a glass transition temperature of 155°C. In addition, the thermal processibility could be improved as the amount of grafted PLLA in the copolymer increased. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41331.
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