Electromagnetic interference shielding property of polybenzoxazine/graphene/nickel composites

• Published in: Reactive & functional polymers Vol. 143; p. 104324
• Main Authors: Zhang, Shuai, Wang, Yan, Ran, Qichao, Fu, Qiang, Gu, Yi
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.10.2019; Elsevier BV
• Subjects: Composite materials; Electrical resistivity; Electromagnetic shielding; Electromagnetics; Ethanol; Fillers; Glass transition temperature; Graphene; Nickel; Polybenzoxazine; Polybenzoxazines; Storage modulus; Strong interactions (field theory); Superhigh frequencies; Ternary composite; Thermal conductivity; Thermal stability; Nickel; Polybenzoxazine; Electromagnetic shielding; Ternary composite
• ISSN: 1381-5148; 1873-166X
• DOI: 10.1016/j.reactfunctpolym.2019.104324

Composite filler of graphene/Nickel (GN) was prepared by in-situ reduction of nickel ions in basic solution of ethanol and water. Graphene layers in GN were decorated by flower-shaped nickel particles in the size of around 100 nm and homogeneous films of ternary composites were prepared from polybenzoxazine and GN. It was found that only 1 wt% of GN could increase the electrical conductivity from 1.57 × 10−12 S/cm (1 Hz) to 3.10 × 10−4 S/cm (1 Hz). As a result, the composites possessed high electromagnetic interference shielding effectiveness (EMI SE) in X-band range and showed an absorption-dominant mechanism. Addition of 3 wt% of GN could meet the requirement of commercial application (>20 dB). Moreover, the uniform dispersion of GN and strong interaction between fillers and matrix ensured greatly improved storage modulus, glass transition temperature, thermal stability and thermal conductivity. [Display omitted]