Composites that can rapidly self-healing their struc-ture and function at room temperature have broad application pros-pects.However,in view of the complexity of composite structure and composition,its self-heal is facing challenges.In this article,supramolecular effect is proposed to repair the multistage structure,mechanical and thermal properties of composite materials.A stiff and tough supramolecular frameworks of 2-[[(butylamino)carbonyl]oxy]ethyl ester(PBA)-polydimethylsiloxane(PDMS)were estab-lished using a chain extender with double amide bonds in a side chain to extend prepolymers through copolymerization.Then,by introduc-ing the copolymer into a folded graphene film(FGf),a highly ther-mally conductive composite of PBA-PDMS/FGf with self-healing capacity was fabricated.The ratio of crosslinking and hydrogen bonding was optimized to ensure that PBA-PDMS could completely self-heal at room temperature in 10 min.Additionally,PBA-PDMS/FGf exhibits a high tensile strength of 2.23±0.15 MPa at break and high thermal conductivity of 13±0.2 W m-1 K-1;of which the self-healing efficiencies were 100％and 98.65％at room temperature for tensile strength and thermal conductivity,respectively.The excellent self-healing performance comes from the efficient supramolecular interaction between polymer molecules,as well as polymer molecule and graphene.This kind of thermal conductive self-healing composite has important application prospects in the heat dissipation field of next generation electronic devices in the future.

Huitao Yu;Can Chen;Jinxu Sun;Heng Zhang;Yiyu Feng;Mengmeng Qin;Wei Feng

School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials,Tianjin University,Tianjin 300350,People's Republic of China;Key Laboratory of Materials Processing and Mold,Ministry of Education,Zhengzhou University,Zhengzhou 450002,People's Republic of China

纳微快报（英文）

[1]Huitao Yu;Can Chen;Jinxu Sun;Heng Zhang;Yiyu Feng;Mengmeng Qin;Wei Feng-.Highly Thermally Conductive Polymer/Graphene Composites with Rapid Room-Temperature Self-Healing Capacity)[J].纳微快报（英文）,2022(08):194-207

butylamino,FGf

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