MXene-氧化石墨烯改性碳纤维/聚乳酸复合材料制备及其力学性能  

Preparation and mechanical properties of MXene-graphene oxide modified carbon fiber/polylactic acid composites

作　　者：左红梅 高敏 阮芳涛 邹梨花 徐珍珍 ZUO Hongmei;GAO Min;RUAN Fangtao;ZOU Lihua;XU Zhenzhen(School of Textile and Garment,Anhui University of Technology,Wuhu,Anhui 241000,China)

机构地区：[1]安徽工程大学纺织服装学院,安徽芜湖241000

出　　处：《纺织学报》2025年第1期9-15,共7页Journal of Textile Research

基　　金：安徽省教育厅高校科学研究项目(2023AH050910,2024AH050105);安徽省高校协同创新工程项目(GXXT-2023096)。

摘　　要：为提高聚乳酸(PLA)的力学性能,以碳纤维(CF)为增强体,研究了CF、聚乙烯亚胺(PEI)和MXene-氧化石墨烯(MXene-GO)改性CF对PLA力学性能的影响。首先,通过PEI在CF表面引入活性胺基基团,得到PEI-CF;其次,通过MXene-GO改性CF-PEI;最后,通过双螺杆挤出机和注射成型方法制备了不同CF/PLA复合材料,探究了PEI和不同MXene-GO质量分数改性CF对CF/PLA复合材料力学性能的影响。结果表明:PEI和MXene-GO改性后CF/PLA复合材料的弹性模量得到了改善;由于纤维的长度小于临界增强长度,PEI和MXene-GO改性对CF/PLA复合材料的拉伸强度影响较小;此外,随着MXene-GO的添加及其质量分数的增加,CF-PEI/PLA复合材料拉伸断裂面越来越不平整,PEI-MXene-GO改性后的CF/PLA复合材料断裂面出现断裂碎片。Objective Polylactic acid(PLA)is a renewable biodegradable material while with limited mechanical properties,which can be improved by adding reinforced fibers.In this research,short carbon fiber(CF)was firstly modified with polyethylenimide(PEI)to prepare CF-PEI,and then modified with graphene oxide(GO)and MXene(MG)solution to prepare CF-PEI-MG.Finally,by using twin-screw extruder and injection molding methods,CF-PEI-MG reinforced PLA(CF-PEI-MG/PLA)composites were prepared and their tensile properties and failure modes were studied.The study provides a reference for the preparation of CF/PLA composites with high mechanical properties.Method MXene was prepared by hydrofluoric acid etching method to further prepare MG solution,where the weight percentage of MG solution was 0.05%,0.1%and 0.2%,respectively.CF-PEI-MG/PLA composites were prepared by the combination of twin-screw extruder and injection molding.The surface morphology of the modified fiber and the fracture cross section of the composite were characterized by scanning electron microscopy(SEM).The universal mechanical testing machine was applied to analyze tensile strength and elastic modulus of the modified composites.The influences of MG concentration on stress-strain curves,mechanical properties and failure modes of CF-PEI-MG/PLA composites were investigated.Results After the modification of CF-PEI by MG,the uneven structure of the fiber surface was covered.In addition,the surface modification showed uniformity for CF-PEI-0.1MG(MG concentration is 0.1%).At the initial loading stage,the stress-strain curve of pure CF/PLA composites rose slowly and demonstrated the smallest slope,while that of CF-PEI/PLA and CF-PEI-MG/PLA composites rose more rapidly,with CF-PEI-0.1MG/PLA composite having the fastest rise and the largest slope.This meant that the interfacial modification of CF had a significant effect on the fracture strain of PLA.In addition,the strength of CF-PEI-0.1MG/PLA composite was the highest.This was because PEI,as a flexible chain segment,could i

关 键 词：碳纤维 氧化石墨烯 过渡金属碳/氮化物 纤维表面改性 纤维增强复合材料 聚乳酸 

分 类 号：TB332[一般工业技术—材料科学与工程] TS101.2[轻工技术与工程—纺织工程]