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Friday, 4 November 2016

Synthesis and characterization of kraft lignin-graft-polylactide copolymers

Published Date
Volume 50, Issue 6pp 1293–1304

Original
DOI: 10.1007/s00226-016-0847-8

Cite this article as: 
Kim, S.J., Kim, Y.S., Lee, OK. et al. Wood Sci Technol (2016) 50: 1293. doi:10.1007/s00226-016-0847-8

Author
  • Seok Ju Kim
  • Yong Sik Kim
  • Oh-Kyu Lee
  • Byoung-Jun Ahn
Abstract

The graft polymerization of polylactic acid (PLA) onto methanol-soluble kraft lignin (MeKL) was performed successfully through acylation substitution using chlorine-terminated PLA with a number average of molecular weight (Mn) of 5400–24,000 g/mol. As the Mn value of the PLA used for the graft polymerization process was increased, the obtained MeKL-g-PLA copolymers decreased from 9,000,000 to 1,100,000 g/mol. The structural characteristics of the MeKL-g-PLA copolymers were analyzed using Fourier transform infrared and 1H nuclear magnetic resonance spectroscopies. It was found that the thermal properties of the MeKL-g-PLA copolymers improved slightly, with their glass-transition temperature increasing to a level higher than that of pure PLA. The tensile strengths and elasticity modulus of the MeKL-g-PLA copolymers were independent of the Mn value and were 3.5–3.8 MPa and 0.038–0.045 GPa, respectively.

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For further details log on website :
http://dx.doi.org/10.1007/s00226-016-0847-8

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