Nam, Ki-Ho Yu, Jaesang You, Nam-Ho Han, Haksoo Ku, Bon-Cheol 2024-01-20T00:32:58Z 2024-01-20T00:32:58Z 2021-09-05 2017-09-08 0266-3538 https://pubs.kist.re.kr/handle/201004/122293 We report a facile method to enhance mechanical properties of polymer nanocomposites using three-dimensional (3D) network structures of functionalized graphene oxide (GO) and multi-walled carbon nanotubes (MWCNTs) in a polymer matrix. The GO and MWCNTs were functionalized using Fisher indole and diazonium-salt reactions to produce pyridine (Py) moiety on the GO and MWCNTs. The functionalized GO (Py-RGO) and MWCNT (Py-MWCNT) nanocomposites exhibited hydrogen-bond assisted 3D network structures in a polyimide (PI) matrix. By incorporating 1 wt% of carbon materials (0.9 wt% Py-RGO and 0.1 wt% Py-MWCNTs) in a PI, the tensile strength and modulus of the ternary nanocomposites reached 581 MPa and 31 GPa, respectively, which was an enhancement of 221% and 312% compared with pristine PI. The fracture energy of the PI/Py-RGO/Py-MWCNT nanocomposites improved 200% and approached 29.7 MJ m(-3). The formation of the 3D network structure of the functionalized carbon nanomaterials is considered to significantly affect load transfer of nanofillers in the polymer matrix, and produce high performance polymer nanocomposites. (C) 2017 Published by Elsevier Ltd. English ELSEVIER SCI LTD THERMAL-PROPERTIES MECHANICAL-PROPERTIES COMPOSITE FILMS TOUGHNESS REDUCTION STRENGTH SHEETS Synergistic toughening of polymer nanocomposites by hydrogen-bond assisted three-dimensional network of functionalized graphene oxide and carbon nanotubes Article 10.1016/j.compscitech.2017.06.025 1 COMPOSITES SCIENCE AND TECHNOLOGY, v.149, pp.228 - 234 COMPOSITES SCIENCE AND TECHNOLOGY 149 228 234 scie scopus 000408286600026 2-s2.0-85021664025 Materials Science, Composites Materials Science Article THERMAL-PROPERTIES MECHANICAL-PROPERTIES COMPOSITE FILMS TOUGHNESS REDUCTION STRENGTH SHEETS Toughness Hydrogen-bond assisted three-dimensional network Polyimide Graphene oxide Multi-walled carbon nanotube