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ABSTRACT
The modification method of grafting multi-walled carbon nanotubes (MWCNT, abbreviated as CNT in this paper) on the surface of flax fibers was investigated, i.e. CNT were grafted onto the surface of flax fibers by silane coupling agent under the action of ultrasonic waves to form covalent bonding. The tensile strength of CNT grafted flax fiber is 22% higher than that of untreated flax fiber monofilament. The tensile strength of FFRP composites after CNT grafting treatment increased by 14.2%; however, the tensile modulus of single fiber and composites did not show a significant increase, the interfacial shear strength of the fiber-resin is 38.3% higher than that of untreated filament. The improvement of the contact angle after grafting was investigated by observing the surface morphology, and the surface of flax filament was characterized by scanning electron microscopy and atomic force microscopy. Also the elemental changes of the flax single fiber surface before and after the treatment were analyzed using X-ray photoelectron spectroscopy. The results showed that the tensile strength of flax single fibers, its composites, and interfacial shear strength of fiber-matrix was improved after CNT grafting treatment but the increase of modulus was not obvious.
摘要
研究了在亚麻纤维表面接枝多壁碳纳米管（MWCNT，本文简称CNT）的改性方法，即在超声波作用下，用硅烷偶联剂将碳纳米管接枝到亚麻纤维表面，形成共价键. CNT接枝亚麻纤维的拉伸强度比未处理的亚麻纤维单丝高22%. CNT接枝处理后的FFRP复合材料的拉伸强度提高了14.2%，但单纤维和复合材料的抗拉模量没有显著提高，纤维树脂的界面剪切强度比未处理的长丝高38.3%. 通过观察表面形貌，研究了接枝后接触角的改善，并用扫描电子显微镜和原子力显微镜对亚麻丝表面进行了表征. 利用X射线光电子能谱分析了亚麻单纤维表面处理前后的元素变化. 结果表明，碳纳米管接枝处理后，亚麻单纤维及其复合材料的拉伸强度和纤维基体的界面剪切强度均有所提高，但模量的提高不明显.
Disclosure statement
No potential conflict of interest was reported by the author(s).