[Nano-Micro Letters]Hierarchically multifunctional polyimide composite films with strongly enhanced thermal conductivity
作者：Yongqiang Guo, Hua Qiu*, Kunpeng Ruan, Yali Zhang and Junwei Gu*
關(guān)鍵字：Thermally conductive composites
論文來源：期刊
具體來源：Nano-Micro Letters
發(fā)表時(shí)間：2021年
https://doi.org/10.1007/s40820-021-00767-4
The development of lightweight and integration for electronics requires flexible films with high thermal conductivity and electromagnetic interference (EMI) shielding to overcome heat accumulation and electromagnetic radiation pollution. Herein, the hierarchical design and assembly strategy was adopted to fabricate hierarchically multifunctional polyimide composite films, with graphene oxide/expanded graphite (GO/EG) as the top thermally conductive and EMI shielding layer, Fe3O4/polyimide (Fe3O4/PI) as the middle EMI shielding enhancement layer and electrospun PI fibers as the substrate layer for mechanical improvement. PI composite films with 61.0 wt% of GO/EG and 23.8 wt% of Fe3O4/PI exhibits high in-plane thermal conductivity coefficient (95.40 W/(m·K)), excellent EMI shielding effectiveness (34.0 dB), good tensile strength (93.6 MPa), and fast electric-heating response (5 s). The test in the central processing unit verifies PI composite films present broad application prospects in electronics fields.
電子產(chǎn)品的輕薄化和高集成化發(fā)展亟需具有優(yōu)異導(dǎo)熱和電磁屏蔽性能的柔性薄膜材料來解決其快速熱積聚和內(nèi)在的電磁干擾問題。本文通過分層設(shè)計(jì)再組裝策略制備了上層為氧化石墨烯/膨脹石墨（GO/EG）、中間層為四氧化三鐵/聚酰亞胺（Fe3O4/PI）、下層為PI纖維的多層級(jí)多功能PI基復(fù)合薄膜。當(dāng)GO/EG和Fe3O4/PI的用量分別為61.0 wt%和23.8 wt%時(shí)，HMPM兼具最佳的面內(nèi)導(dǎo)熱系數(shù)（95.40 W/(m·K)）、電磁屏蔽效能（34.0 dB），優(yōu)異的拉伸強(qiáng)度（93.6 MPa）和快速的電熱響應(yīng)性（5 s）。以電腦CPU為實(shí)際散熱場(chǎng)景驗(yàn)證了PI復(fù)合薄膜在輕薄化、小型化的電子設(shè)備領(lǐng)域具有廣闊應(yīng)用前景的可能性。