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Research Article

Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding

Wang Yang1,§, Hengxuan Bai1,§, Bo Jiang1, Chaonan Wang1, Weimin Ye1, Zhengxuan Li1, Chong Xu1, Xiaobai Wang2( ), Yongfeng Li1( )
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China
Department of Materials Application Research, AVIC Manufacturing Technology Institute, Beijing 100024, China

§ Wang Yang and Hengxuan Bai contributed equally to this work.

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Graphical Abstract

Densified, lightweight, flexible, and large-size graphene/polyurethane composite films are fabricated, and yield high electrical conductivity, good cross-plane thermal conductivity (1.13 W/m·K), and excellent electromagnetic interference shielding performance (73.4 dB).

Abstract

High-performance electromagnetic interference (EMI) shielding materials with flexibility, excellent mechanical property, and thermal conductivity are highly desired for fifth-generation communications devices. Graphene exhibits tremendous potential due to its high electrical conductivity and unique lamellar structure. However, the construction of densified graphene structure in polymer matrix is still challenging. Herein, we develop a graphene/waterborne polyurethane (G/WPU) flexible film with densified and ordered layer-structure for using as an EMI shielding material. By virtue of the polyvinylpyrrolidone modified strategy and facile liquid phase ball-milling treatment, the graphene nanosheets can be efficiently dispersed into the WPU substrate and tightly connected between each other via internal interactions. Benefiting from the relatively low defects and densified structure of graphene, the resultant G/WPU film yields a high electrical conductivity of 1,004.5 S/m, and a tensile strength of around 48.5 MPa. As a consequence, it achieves an average EMI shielding effectiveness of over 30 dB in the X-band with a thickness of merely 0.15 mm and the value is further enhanced to 73.4 dB at 0.9 mm with a low density of 1.4 g/cm3, offering over 99.99999% shielding of incident electromagnetic waves. More importantly, this G/WPU film also exhibits a high cross-plane thermal conductivity of about 1.13 W/(m·K). Thus, this work develops a high-performance EMI shielding material with both good capacity of heat transmission, but also provides a facile strategy for designing next-generation advanced, lightweight, flexible, and multifunction shielding materials.

Keywords

electromagnetic interference shieldinggraphenedensificationflexiblethermal conductivity

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Nano Research
Volume 15 Issue 11,
November 2022
Pages 9926-9935
DOI: 10.1007/s12274-022-4414-3
Cite this article:
Yang W, Bai H, Jiang B, et al. Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding. Nano Research, 2022, 15(11): 9926-9935. https://doi.org/10.1007/s12274-022-4414-3
Topics:
Conductive films
Part of a topical collection:
Eighth Nano Research Award

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Received: 30 January 2022
Revised: 09 April 2022
Accepted: 11 April 2022
Published: 28 May 2022
© Tsinghua University Press 2022
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