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Open AccessArticle

Effect of Lignin Plasticization on Physico-Mechanical Properties of Lignin/Poly(Lactic Acid) Composites

1
College of Forest & Environmental Science, Kangwon National University, Chuncheon 24341, Korea
2
Division of Wood Chemistry, National Institute of Forest Science, Seoul 02455, Korea
3
Kangwon Institute of Inclusive Technology, Kangwon National University, Chuncheon 24341, Korea
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 2089; https://doi.org/10.3390/polym11122089
Received: 7 November 2019 / Revised: 7 December 2019 / Accepted: 11 December 2019 / Published: 13 December 2019
(This article belongs to the Special Issue Properties, Applications and Perspectives of Lignin)
Kraft lignin (KL) or plasticized KL (PKL)/poly(lactic acid) (PLA) composites, containing different lignin contents and with and without the coupling agent, were prepared in this study using twin-screw extrusion at 180 °C. Furthermore, ε-caprolactone and polymeric diphenylmethane diisocyanate (pMDI) were used as a plasticizer of KL and a coupling agent to improve interfacial adhesion, respectively. It was found that lignin plasticization improved lignin dispersibility in the PLA matrix and increased the melt flow index due to decrease in melt viscosity. The tensile strength of KL or PKL/PLA composites was found to decrease as the content of KL and PKL increased in the absence of pMDI, and increased due to pMDI addition. The existence of KL and PKL in the composites decreased the thermal degradation rate against the temperature and increased char residue. Furthermore, the diffusion coefficient of water in the composites was also found to decrease due to KL or PKL addition. View Full-Text
Keywords: lignin composite; twin-screw extrusion; plasticization; coupling agent lignin composite; twin-screw extrusion; plasticization; coupling agent
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MDPI and ACS Style

Park, C.-W.; Youe, W.-J.; Kim, S.-J.; Han, S.-Y.; Park, J.-S.; Lee, E.-A.; Kwon, G.-J.; Kim, Y.-S.; Kim, N.-H.; Lee, S.-H. Effect of Lignin Plasticization on Physico-Mechanical Properties of Lignin/Poly(Lactic Acid) Composites. Polymers 2019, 11, 2089.

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