羧基化多壁碳纳米管改性洋麻纤维对其环氧树脂复合材料界面性能的影响  

Effect of carboxylated multi-walled carbon nanotubes modified kenaf fiber on interfacial properties of epoxy resin composites

作　　者：张洪康 王春红[1] 左祺 李明[1] 王晓云[1] ZHANG Hongkang;WANG Chunhong;ZUO Qi;LI Ming;WANG Xiaoyun(School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387

出　　处：《复合材料学报》2022年第5期2153-2160,共8页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11802205);天津市研究生科研创新项目(2020YJSB063)。

摘　　要：植物纤维增强复合材料正广泛应用于生活中各领域,但亲水性增强体与疏水性基体之间界面不相容的问题限制了复合材料的力学性能,本论文通过羧基化碳纳米管(c-MWCNTs)改性洋麻纤维,探究洋麻纤维/环氧树脂复合材料的界面改善机制。首先利用水和NaOH对洋麻纤维进行预处理,通过观测纤维直径变化、红外光谱图和纤维束断裂强度变化,探讨不同预处理方式对c-MWCNTs接枝洋麻纤维的效果影响;然后使用含量分别为0.5wt%、1wt%和3wt%的c-MWCNTs改性洋麻纤维,通过单纤维抽拔实验,探讨洋麻纤维/环氧树脂复合材料的界面剪切强度(IFSS)变化。结果表明,与原洋麻纤维和水预处理过的洋麻纤维相比,经过NaOH处理后的洋麻纤维,直径变化幅度和纤维束断裂强度降低幅度最小,复合材料的尺寸稳定性较高;通过单纤维抽拔实验证明,洋麻纤维/环氧树脂复合材料的界面剪切强度逐渐升高,但是有效性逐渐降低,当c-MWCNTs质量分数为0.5wt%时,c-MWCNTs处理洋麻纤维的有效性最高,达到45.09%;洋麻纤维/环氧树脂复合材料的界面性能得到改善,c-MWCNTs的存在增强了纤维与树脂基体间的机械锁结作用。Plant fiber reinforced composites are being applied to various fields of life.The interfacial incompatibility between hydrophilic reinforcement and hydrophobic matrix limits the mechanical properties of composites.In this paper,the kenaf fiber was modified by carboxylated carbon nanotubes(c-MWCNTs)to explore the interface improvement mechanism of kenaf fiber/epoxy resin composites.Firstly,the kenaf fiber was pretreated by water and NaOH.The effects of different pretreatment methods on the grafting of c-MWCNTs by kenaf fiber were investigated by observing the changes of fiber diameter,infrared spectrum and fiber bundle fracture strength.Then the kenaf fibers were modified with 0.5wt%,1wt%and 3wt%c-MWCNTs,respectively.Interfacial shear strength(IFSS)of kenaf fiber/epoxy composites was investigated by single fiber pull-out test.The results show that the diameter variation,the removal of non-cellulose components and the decrease of fiber bundle fracture strength of kenaf fiber after alkali treatment are the smallest and the dimensional stability of composite is higher.Through single fiber pull-out test,IFSS of the kenaf fiber/epoxy resin composite increases gradually,but the effectiveness decreases gradually.When the mass fraction of c-MWCNTs is 0.5wt%,the effectiveness is the highest,and the improvement effect reaches 45.09%.The interfacial properties of kenaf fiber/epoxy resin composites modified by c-MWCNTs are improved.Due to the existence of c-MWCNTs,the mechanical lock between fiber and resin matrix is strengthened.

关 键 词：羧基化多壁碳纳米管 洋麻纤维 单纤维抽拔实验 界面性能 植物纤维增强复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]