▎ 摘　　要

Revealing the bending mechanism of graphene nanosheets (GNSs) is crucial in improving the thermal properties of GNSs and their derivatives. For the effective application of graphene-based composites, the effect of bending on the thermal conductivity must be investigated. Consequently, the bending mechanism of GNSs in the dynamic compounding process was studied using molecular dynamics (MD). According to the MD simulation and previous experimental study, finite element models of bent GNSs and GNSs/epoxy composites were designed, to study the influence of bending content on thermal conductivity. The investigations indicate that the thermal conductivity of bent GNSs along the X-axis (K-GNS,K-x) decreases linearly with the increase in height and number of bends. With the increase in bending length, K-GNS,K-x initially decreases and then increases when the bend is low, while it always decreases when the bend is high. The thermal conductivity of bent GNSs/epoxy composites along the X-axis (K-c,K-x) follows a similar trend and reduces sharply with increasing height. Contrastingly, K-c,K-x always increases with the increasing length of bends. The results show that long and low bends in graphene improve thermal conductivity of graphene filled composites. (C) 2022 The Authors. Published by Elsevier Ltd.