Lee, Sangyoon Jin, Jeong-Un Hahn, Jae Ryang Ryu, Seongwoo You, Nam-Ho 2024-02-07T05:11:11Z 2024-02-07T05:11:11Z 2024-02-07 2024-02 1359-8368 https://pubs.kist.re.kr/handle/201004/148516 The main issues with developing graphene as a reinforcement are its mono-dispersive properties and strong interfacial bonding between matrix and graphene. In this study, we synthesized reduced graphene oxide (rGO) that is mono-dispersive in polar solvents, by designing structural isomers (-para and -meta) for poly(vinyl alcohol) (PVA) nanocomposites. The hydrazine-methylpyridine synthesized with different structural isomers was used to reduce and functionalize graphene oxide (GO). The -meta structural isomers showed a higher reduction rate and functional groups on GO than -para due to the difference in electrophilic strain. In particular, the prepared rGO reduced by meta-hydrazine-methylpyridine (m-Py-rGO) exhibited excellent mono dispersive characteristics in water solvents as well as in PVA matrix. As a result, nanocomposites containing 1 wt % m-PyrGO increased in tensile strength and modulus by 48 % (85.95 MPa) and 82 % (4.27 GPa), respectively, compared to pristine PVA. In this study, a method for manufacturing rGO with excellent dispersibility in water, an inexpensive solvent, and its application method are presented. English Pergamon Press Ltd. Highly water-dispersible methylpyridinium salt functionalized reduced graphene oxide and poly(vinyl alcohol) composites Article 10.1016/j.compositesb.2023.111142 1 Composites Part B: Engineering, v.271 Composites Part B: Engineering 271 N scie scopus 001145227900001 2-s2.0-85180536423 Engineering, Multidisciplinary Materials Science, Composites Engineering Materials Science Article CHEMICAL-REDUCTION CARBON NANOCOMPOSITES FILMS Reduced graphene oxide Functionalized graphene oxide Composite poly(vinyl alcohol)