TY - JOUR
T1 - Interfacial structures and mechanisms for strengthening and enhanced conductivity of graphene/epoxy nanocomposites
AU - Zheng, W.
AU - Chen, W. G.
AU - Zhao, Q.
AU - Ren, S. X.
AU - Fu, Y. Q.
PY - 2019/2/1
Y1 - 2019/2/1
N2 - Graphene/epoxy resin nanocomposites were prepared using an in-situ polymerization process, and their formation mechanisms, microstructures, mechanical properties and electrical conductivity were characterized. Results showed that graphene is well dispersed in the epoxy matrix, and covalent cross-links are formed between graphene and epoxy matrix. Tensile strength and modulus of the graphene/epoxy composites were found to increase firstly and then decrease with the increase of graphene loading contents. When the graphene content was 0.3 wt%, tensile strength, tensile modulus and elongation were found to increase by 46.8%, 47.3% and 24.0% compared with those of pure epoxy resin. When the graphene content was 1.38 vol%, the conductivity of the composite was 3.28 × 10−4 S m−1 with a low percolation threshold of 0.47 vol%. Enhancement mechanisms for the properties of composites were identified to be dispersion strengthening, effective transfer of stress and bridging of graphene.
AB - Graphene/epoxy resin nanocomposites were prepared using an in-situ polymerization process, and their formation mechanisms, microstructures, mechanical properties and electrical conductivity were characterized. Results showed that graphene is well dispersed in the epoxy matrix, and covalent cross-links are formed between graphene and epoxy matrix. Tensile strength and modulus of the graphene/epoxy composites were found to increase firstly and then decrease with the increase of graphene loading contents. When the graphene content was 0.3 wt%, tensile strength, tensile modulus and elongation were found to increase by 46.8%, 47.3% and 24.0% compared with those of pure epoxy resin. When the graphene content was 1.38 vol%, the conductivity of the composite was 3.28 × 10−4 S m−1 with a low percolation threshold of 0.47 vol%. Enhancement mechanisms for the properties of composites were identified to be dispersion strengthening, effective transfer of stress and bridging of graphene.
KW - Graphene
KW - Nanocomposites
KW - Mechanical properties
KW - Interface characterization
U2 - 10.1016/j.polymer.2018.12.055
DO - 10.1016/j.polymer.2018.12.055
M3 - Article
VL - 163
SP - 171
EP - 177
JO - Polymer
JF - Polymer
SN - 0032-3861
ER -