▎ 摘　　要

Since the conventional high-permittivity polymer materials release toxic residues into the environment during their syntheses and decomposition processes, eco-friendly dielectric polymers are urgently demanded. In this work, a simple and environmentally friendly strategy was adopted to obtain chitosan functionalized graphene oxide for developing dielectric composites. Firstly, the chitosan functionalized graphene oxide was prepared by self-assembly of both components via electrostatic interactions and hydrogen bonding. After that, chitosan functionalized graphene oxide was reduced using L-ascorbic acid as the reducing agent. Additionally, relying on the stimulation responsiveness of chitosan, an electrostatic repulsion can minimize the re-aggregation of chitosan functionalized reduced graphene oxide during composites fabrication processing. The results indicated that the prepared composites exhibited a better balance between dielectric permittivity and loss. Our goal is to present a strategy for the design and preparation of a composite with enhanced dielectric performance by solution blending with pH as a stimulus. (c) 2020 Elsevier B.V. All rights reserved.