当可逆交联弹性体遇到碳纤维:具有优异抗撕裂性能的柔性可回收复合材料  

When Reversibly Cross-linked Elastomers Meet Carbon Fibers:Flexible and Recyclable Composite Materials with Excellent Tearing Resistance

作　　者：陈学思[1] Xue-si Chen(Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022)

机构地区：[1]中国科学院长春应用化学研究所,长春130022

出　　处：《高分子学报》2024年第12期1617-1621,共5页Acta Polymerica Sinica

摘　　要：兼具高柔性、优异抗撕裂性能的可回收碳纤维增强聚合物复合材料(CFRPs)的制备需依赖于具有高能量耗散能力的弹性体黏合剂的设计.满足这一需求的弹性体应集成高黏附性、低弹性模量、高力学强度、高韧性和高抗撕裂能力.然而,制备这种弹性体面临巨大挑战,因为这些性能之间通常是相互排斥的.最近,孙俊奇等设计了“多层级超分子作用力”,并以其聚集形成的微相结构交联高柔性的聚四氢呋喃链段,成功制备了的断裂强度达83 MPa,韧性达619 MJ·m^(−3),断裂能达357 kJ·m^(−2),但模量仅为5.6 MPa的弹性体黏合剂.将该弹性体黏合剂和碳纤维布复合制备的碳纤维/弹性体复合材料具有高达767 MPa的断裂强度和创纪录的断裂能(2012 kJ·m^(−2)).该复合材料还具备修复缺陷和解离回收碳纤维布和弹性体的性能.The fabrication of recyclable carbon fiber-reinforced polymer composites(CFRPs)with high flexibility and excellent tearing resistance relies on the performance of the elastomer adhesives.To meet these requirements,the elastomers should possess high adhesion,low Young’s modulus,high mechanical strength,toughness,and outstanding tearing resistance.However,achieving such a combination in a single elastomer is highly challenging,as these properties are often mutually exclusive.Recently,Junqi Sun et al.at Jilin University successfully fabricated an elastomer adhesive by physically crosslinking polytetrahydrofuran-based polyurethane(PU)chains with in situ-formed nanodomains composed of hierarchical supramolecular interactions of hydrogen and coordination bonds.This elastomer adhesive exhibits a tensile strength of 83 MPa,toughness of 619 MJ·m^(−3),fracture energy of 357 kJ·m^(−2),and a low modulus of 5.6 MPa.The carbon fiber/elastomer composite materials prepared using this elastomer adhesive exhibit a high tensile strength of 767 MPa and a record-high fracture energy of 2012 kJ·m^(−2).Moreover,these composites can heal defects when heated and be recycled through the dissociation of the PU elastomer adhesives.

关 键 词：可逆交联弹性体 碳纤维增强聚合物复合材料 抗撕裂材料 可回收聚合物 

分 类 号：TB332[一般工业技术—材料科学与工程]