Bioinspired supramolecular stress buffer between carbon fiber and epoxy resin for high interfacial performances and toughness of composites  

仿生超分子应力缓冲层用于提升复合材料的界面性能和韧性

作　　者：Wei Sun Mingshuo Chen Hongtao Liu Yining Wang Yongping Hou Mingjie Liu 孙伟;陈明烁;刘洪涛;王依宁;侯永平;刘明杰

机构地区：[1]Key Laboratory of Bioinspired Smart Interfacial Science and Technology of Ministry of Education,School of Chemistry,Beihang University(BUAA),Beijing 100191,China

出　　处：《Science China Materials》2025年第4期1230-1239,共10页中国科学(材料科学)(英文版)

基　　金：supported by the National Natural Science Foundation of China(21673015)。

摘　　要：Carbon fiber reinforced polymer composites(CFRPs)possess contrastingly high strength but low toughness,which limits their application under special circumstances,such as high stress,cryogenic temperatures,or vibration.The chemical inertness and smooth surface of carbon fiber(CF)are the main reasons behind the low toughness of CFRPs,characterized by poor interfacial performances,including low strength and low toughness.Biological organisms possess structures or chemical compositions that contribute to exhibiting strong interfacial adhesions.Herein,we construct a mussels-inspired supramolecular stress buffer(i.e.,Fe(III)-tannic acid buffer,Fe-TA buffer)on CF to distribute stress and improve the interfacial performances and toughness of CFRPs.The Fe-TA buffer can improve interfacial performances by rough biomimetic interfacial structure,introducing multiple supramolecular interfacial interactions and improving interfacial wettability,ultimately resolving the common issue of low toughness in the CFRPs.In the presence of Fe-TA buffer,the interfacial shear strength(IFSS)value and mode II critical strain energy release rate(GIIC)value are enhanced by 17.0%and 41.8%,respectively.This research provides a design for a stress buffer between resin matrix and inorganic enhancer which results in high interfacial strength and toughness.碳纤维增强聚合物复合材料(CFRPs)具有较高的强度,但较低的韧性限制了其在高应力、低温或振动等特殊环境下的应用.碳纤维(CF)的化学惰性和表面光滑是导致复合材料的界面性能较差和韧性低的主要原因.生物有机体由于其具有特殊的界面粘附结构和化学组成从而具有优异的界面性能.受贻贝启发,本文在碳纤维表面构建了一种超分子应力缓冲层(即Fe(Ⅲ)-TA应力缓冲层),用来分散应力,提高CFRPs的界面性能和韧性.Fe-TA应力缓冲层可以通过粗糙的仿生界面结构、引入多重超分子界面相互作用和提高界面润湿性来改善界面性能,最终解决碳纤维复合材料普遍存在的韧性低的问题.在Fe-TA应力缓冲层的作用下,CFRPs的界面剪切强度(IFSS)值和层间剪切强度(GIIC)值分别提高了17.0%和41.8%.本研究为树脂基体和无机增强体之间的应力缓冲层的设计提供了一种新的设计方案,为提高复合材料的界面强度和韧性提供了新思路.

关 键 词：BIONICS stress buffer carbon fiber reinforced composites interfacial performances toughness 

分 类 号：TB332[一般工业技术—材料科学与工程]