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Polymers 2018, 10(2), 177;

Functionalization of Graphene Oxide with Low Molecular Weight Poly (Lactic Acid)

Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China
Engineering Research Center of Biopolymer Functional Materials of Yunnan, Yunnan Minzu University, Kunming 650500, China
Author to whom correspondence should be addressed.
Received: 27 December 2017 / Revised: 1 February 2018 / Accepted: 4 February 2018 / Published: 12 February 2018
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In this paper, the hydroxyl groups on the surface of graphene oxide (GO) were used to initiate the ring-opening polymerization of a lactic acid O-carboxyanhydride. GO grafted with poly (l-lactic acid) molecular chains (GO-g-PLLA) was prepared. Lactic acid O-carboxyanhydride has a higher polymerization activity under mild polymerization conditions. Thus, the functionalization of the polymer chains and obtaining poly (lactic acid) (PLLA) was easily achieved by ring-opening polymerization with 4-dimethylaminopyridine (DMAP) as the catalyst. The results showed that with this method, PLLA can be rapidly grafted to the surface of GO in one step. As a result, the chemical structure of the GO surface was altered, improving its dispersion in organic solvents and in a PLLA matrix, as well as its bonding strength with the PLLA interface. We then prepared GO/PLLA and PLLA/GO-g-PLLA composite materials and investigated the differences in their interfacial properties and mechanical properties. GO-g-PLLA exhibited excellent dispersion in the PLLA matrix and formed excellent interfacial bonds with PLLA through mechanical interlocking, demonstrating a significant enhancement effect compared to PLLA. The water vapor and oxygen permeabilities of the GO-g-PLLA/PLLA composite decreased by 19% and 29%, respectively. View Full-Text
Keywords: GO-g-PLLA; composite materials; water vapor; oxygen permeabilities GO-g-PLLA; composite materials; water vapor; oxygen permeabilities

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Yuan, M.; Chen, Y.; Yuan, M.; Li, H.; Xia, X.; Xiong, C. Functionalization of Graphene Oxide with Low Molecular Weight Poly (Lactic Acid). Polymers 2018, 10, 177.

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