期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 194, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2020.108190
关键词
Thermal conductivity; EMI shielding performance; Dual-functional composites; Flexibility; Performance stability
资金
- National Natural Science Foundation of China [51533004, 51773136, 21878194]
Effective heat dissipation capacity and electromagnetic interference (EMI) shielding performance are urgently required for modern electronic equipment. Herein, pristine carbon nanotubes (CNTs) were first nondestructively functionalized by eco-friendly dopamine chemistry, which maintained the integrity of inherent graphitic lattice structure of CNTs. In the meanwhile, introduction of polydopamine (PDA) improved interfacial interaction between PDA-coated CNTs (CNT@PDA) and the ethylene-vinyl acetate copolymer (EVA) matrix. Favorable pathways for rapid thermal conduction and electron transmission were paved by oriented arrangement of CNT@PDA. As a result, dual-functional CNT@PDA/EVA composite films were fabricated, which exhibited remarkable inplane thermal conductivity (TC) and prominent EMI shielding effectiveness (EMI SE). The TC and EMI SE of the 70 wt% CNT@PDA/EVA composite film climbed up to 17.9 W/mK and 32.4 dB, respectively. Furthermore, the CNT@PDA/EVA composite films revealed outstanding flexibility and mechanical fatigue durability. After repeated bending test, the retention ratio of the in-plane TC and EMI SE was 98% and 97%, respectively. The inplane TC and EMI SE presented excellent retention ratio of 94% and 95% after repeated tensile test, respectively. Our work provides a valuable reference to design and fabricate dual-functional or multifunctional composites applied in modern electrical systems and electronic devices.
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