Polydimethylsiloxane/aluminum oxide composites prepared by spatial confining forced network assembly for heat conduction and dissipation. Issue 63 (23rd October 2018)

• Record Type: Journal Article
• Authors: Si, Wuyan; He, Xiaoxiang; Huang, Yao; Gao, Xiaolong; Zheng, Xiuting; Zheng, Xupeng; Leng, Chong; Su, Fengchun; Wu, Daming
• Is Part Of: RSC advances. Volume 8:Issue 63(2018)
• Page Start: 36007
• Page End: 36014
• Publication Date: 2018-10-23
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c8ra07229a
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Constructing a compacted network in polymer matrices is an important method to improve the thermal conductivity (TC) of polymer composites. Abstract : Constructing a compacted network in polymer matrices is an important method to improve the thermal conductivity (TC) of polymer composites. In this paper, a compacted network was built using the Spatial Confining Forced Network Assembly (SCFNA) method. The homogeneous compound of polymer and fillers, prepared using a conical twin-screw mixer, was placed in a compression mold with confining space to carry out two-stage compression, free compression and spatial confining compression. Aluminum oxide (Al2 O3 ) was studied as filler in a polydimethylsiloxane (PDMS) matrix to illustrate the applicability of the SCFNA method. The polymer composites with an Al2 O3 filler ranging from 10 to 80 wt% were prepared. When the filler content was 80 wt%, the TC of the PDMS/Al2 O3 composites prepared using the SCFNA method increased by 16.35 times in comparison to the TC of pure PDMS. Observing the SEM of PDMS/Al2 O3 composites with various thicknesses, the gap between fillers decreased with a decrease in thickness. The composite with TC up to 2.566 W (mK) −1 obtained at 80 wt% filler was further employed as a heat spreader, causing a decrease of about 8.23 °C in the set-point compared with the temperature of the heat source.