Polyurethane foam-supported three-dimensional interconnected graphene nanosheets network encapsulated in polydimethylsiloxane to achieve significant thermal conductivity enhancement

doi:10.1007/s11706-023-0653-9

Front. Mater. Sci.

2023, Vol. 17

Issue (3) : 230653 https://doi.org/10.1007/s11706-023-0653-9

RESEARCH ARTICLE

Polyurethane foam-supported three-dimensional interconnected graphene nanosheets network encapsulated in polydimethylsiloxane to achieve significant thermal conductivity enhancement

Wenjing Li, Ni Wu, Sai Che, Li Sun, Hongchen Liu, Guang Ma, Ye Wang, Chong Xu, Yongfeng Li(

)

State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

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Abstract

Polyurethane (PU) foams are widely used in thermal management materials due to their good flexibility. However, their low thermal conductivity limits the efficiency. To address this issue, we developed a new method to produce tannic acid (TA)-modified graphene nanosheets (GTs)-encapsulated PU (PU@GT) foams using the soft template microstructure and a facile layer-by-layer (L-B-L) assembly method. The resulting PU@GT scaffolds have ordered and tightly stacked GTs layers that act as three-dimensional (3D) highly interconnected thermal networks. These networks are further infiltrated with polydimethylsiloxane (PDMS). The through-plane thermal conductivity of the polymer composite reaches 1.58 W·m⁻¹·K⁻¹ at a low filler loading of 7.9 wt.%, which is 1115% higher than that of the polymer matrix. Moreover, the mechanical property of the composite is ~2 times higher than that of the polymer matrix while preserving good flexibility of the polymer matrix owing to the retention of the PU foam template and the construction of a stable 3D graphene network. This work presents a facile and scalable production approach to fabricate lightweight PU@GT/PDMS polymer composites with excellent thermal and mechanical performance, which implies a promising future in thermal management systems of electronic devices.

Keywords graphene nanosheet polyurethane foam polymer composite thermal and mechanical property

Corresponding Author(s): Yongfeng Li

Issue Date: 14 July 2023

Cite this article:

Wenjing Li,Ni Wu,Sai Che, et al. Polyurethane foam-supported three-dimensional interconnected graphene nanosheets network encapsulated in polydimethylsiloxane to achieve significant thermal conductivity enhancement[J]. Front. Mater. Sci., 2023, 17(3): 230653.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-023-0653-9
https://academic.hep.com.cn/foms/EN/Y2023/V17/I3/230653

Fig.1 Schematic diagram of the preparation for PU@GT/PDMS.

Fig.2 SEM images of (a) pristine graphene nanosheets and (b) GT. (c) Zeta potentials of GT and His aqueous solutions. (d) Optical photos of GT dispersions before (left) and after (right) the addition of His.

Fig.3 Cross-sectional SEM images of (a) the PU foam and (b)(c)(d)(e)(f) PU@GT-x (x = 5, 10, 15, 20, and 25 from panel (b) to panel (f)). (g)(h)(i) Element mapping images of PU@GT.

Fig.4 (a) TGA curves of PU, His, and PU@GT. (b) FTIR spectra of PU and PU@GT.

Fig.5 (a) The cross-plane thermal conductivity and (b) the thermal conductivity enhancement of PDMS composites. (c) Comparison of thermal conductivities for the reported 3D graphene/polymer composites.

Fig.6 (a) Tensile stress?strain curves and (b) tensile stress/elastic modulus values of PDMS and the PDMS composites. (c) Optical photos of PU@GT after 50 compressions.

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