新型炭材料（中英文）2024，Vol.39Issue(2)：271-282,12.DOI:10.1016/S1872-5805(24)60835-8
聚酰亚胺辅助制备高定向石墨烯基全炭泡沫及其在导热聚合物复合材料中的应用
Polyimide-assisted fabrication of highly oriented graphene-based all-carbon foams for increasing the thermal conductivity of polymer composites
摘要
Abstract
Graphene and its derivatives are often preferentially oriented horizontally during processing because of their two-di-mensional(2D)layer structure.As a result,thermal interface materials(TIMs)composed of a polymer matrix and graphene-derived fillers often have a high in-plane(IP)thermal conductivity(K),however,the low through-plane(TP)K makes them unsuitable for practical use.We report the development of high-quality polyimide/graphite nanosheets(PG)perpendicular to the plane using a dir-ectional freezing technique that increase the TP K of polymer-based composites.Graphene-derived nanosheets(GNs)were obtained by the crushing of scraps of highly thermally conductive graphene films.A water-soluble polyamic acid salt solution was used to dis-perse the hydrophobic GNs filler to achieve directional freezing.The polyimide,which facilitated the directional alignment of the GNs,was then graphitized.The introduction of the GNs increases the order and density of the PG,thus improving the strength and heat transfer performance of its polydimethylsiloxane(PDMS)composite.The obtained PG/PDMS composite(21.1％PG,mass frac-tion)has an impressive TP K of14.56 W·m-1·K-1,81 times that of pure PDMS.This simple polyimide-assisted 2D hydrophobic fillers alignment method provides ideas for the widespread fabrication of anisotropic TIMs and enables the reuse of scraps of graphene films.关键词
石墨烯膜/二次利用/热导率/各向异性泡沫/热界面材料Key words
Graphene film/Reutilization/Thermal conductivity/Anisotropic foam/Thermal interface materials分类
通用工业技术引用本文复制引用
熊科,孙智鹏,胡吉辰,马成,王际童,葛翔,乔文明,凌立成..聚酰亚胺辅助制备高定向石墨烯基全炭泡沫及其在导热聚合物复合材料中的应用[J].新型炭材料（中英文）,2024,39(2):271-282,12.基金项目
This work is partly supported by the National Natural Science Foundation of China(22178107,U21A2060,22178116 and 21978097),Xinjiang Uy-gur Autonomous Region Key Research and Develop-ment Program(2022B01030),and Shanghai Pujiang Program(21PJD019). 国家自然科学基金(22178107,U21A2060,22178116,21978097),新疆维吾尔自治区重点研发计划(2022B01030),上海市浦江计划(21PJD019). （22178107,U21A2060,22178116 and 21978097）
