Constructing a "Pearl-Necklace-Like" architecture for enhancing thermal conductivity of composite films by electrospinning. (January 2022)

• Record Type: Journal Article
• Authors: Wei, Zhouqiao; Kong, Xiangdong; Cheng, Jingzhen; Zhou, Hua; Yu, Jinhong; Lu, Shaorong
• Is Part Of: Composites communications. Volume 29(2022)
• Publication Date: 2022-01
• Subjects: Alumina -- Polyvinyl alcohol -- Electrospinning -- Thermal conductivity -- Electrical insulation
• DOI: 10.1016/j.coco.2021.101036
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: With the integration level and power density of electronic devices increasing, highly thermally conductive yet electrically insulating polymer composites are growing demands for thermal management applications. Herein, we report a composite film with a "pearl-necklace-like" structure composed of polyvinyl alcohol (PVA) and alumina (Al2 O3 ) by electrospinning technique, which exhibits enhanced high thermal conductivity, excellent electrical insulation, and outstanding flexibility simultaneously. The in-plane thermal conductivity of the PVA/Al2 O3 composite film with 65 wt % Al2 O3 loading reaches 31.69 W m -1 K -1 . Meanwhile, the composite films still retained highly electrical insulation (volume resistivity 1.94 × 10 11 Ω·cm) and presented excellent stability in a wide range of temperatures before and after heating and cooling cycles. This study provides a practical route to prepare the polymer composites with high thermal conductivity and excellent electrical insulation for thermal management applications in modern electronic devices. Graphical abstract: Image 1 Highlights: A "pearl-necklace-like" polyvinyl alcohol/alumina fibers were fabricated via electrospinning. The in-plane thermal conductivity of the polyvinyl alcohol/alumina composite film reaches 31.69 W m -1 K -1 . The alumina interconnection in polyvinyl alcohol fibers improved the thermal transport property of the composite.