Effect of fiber surface treatment with silane coupling agents and carbon nanotubes on mechanical properties of carbon fiber reinforced polyamide 6 composites

IF 4.8 2区 材料科学 Q2 MATERIALS SCIENCE, COMPOSITES
Haoqiang Du, Guijun Xian, Jingwei Tian, Zirong Ma, Chenggao Li, Meiyin Xin, Yunfeng Zhang
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Abstract

The mechanical properties of carbon fiber (CF) reinforced thermoplastic polymer composites are primarily governed by the interphase between CFs and matrix. However, the inherent inertness of CF surfaces combined with the high viscosity and processing temperatures of thermoplastic resin often result in relatively weak interfacial bonding. This study aims to enhance the interfacial adhesion of carbon fiber reinforced polyamide 6 composites to improve their mechanical properties. CFs were de‐sized and oxidized, followed by re‐sizing with silanized carbon nanotubes. Fracture morphology and composition analysis of the fibers were conducted, and the fibers were subsequently incorporated into composites for mechanical testing. Results revealed a 20.0% increase in tensile strength, a 25.11% increase in flexural strength, and a 24.88% increase in interlaminar shear strength for the resized‐carbon fiber reinforced polyamide 6 composites compared to the pristine‐carbon fiber reinforced polyamide composites. The cross‐sectional morphology of the modified composites exhibited a zig‐zag fracture pattern. Dynamic mechanical analysis indicated that the modified fibers required higher activation energy for the free movement of the polyamide 6 molecular chain. These findings suggest that surface treatment enhances the interfacial adhesive between CF and resin, thereby significantly improving the mechanical properties of carbon fiber reinforced polyamide 6 composites.Highlights An efficient and reliable carbon fiber surface treatment method is proposed. Surface modification improves surface chemical activity of carbon fibers. Composites show substantial improvements in mechanical properties. Interfacial performance enhancement mechanism of composite was revealed.

Abstract Image

用硅烷偶联剂和碳纳米管进行纤维表面处理对碳纤维增强聚酰胺 6 复合材料机械性能的影响
碳纤维(CF)增强热塑性聚合物复合材料的机械性能主要受碳纤维与基体之间的相位影响。然而,碳纤维表面固有的惰性加上热塑性树脂的高粘度和加工温度,往往导致界面粘合力相对较弱。本研究旨在增强碳纤维增强聚酰胺 6 复合材料的界面粘合力,以改善其机械性能。首先对碳纤维进行去尺寸和氧化处理,然后用硅烷化碳纳米管重新调整尺寸。对纤维进行了断裂形态和成分分析,随后将纤维加入复合材料中进行机械测试。结果显示,与棱柱碳纤维增强聚酰胺复合材料相比,重新定径的碳纤维增强聚酰胺 6 复合材料的拉伸强度提高了 20.0%,弯曲强度提高了 25.11%,层间剪切强度提高了 24.88%。改性复合材料的横截面形态呈现出 "之 "字形断裂模式。动态机械分析表明,改性纤维在聚酰胺 6 分子链自由运动时需要更高的活化能。这些研究结果表明,表面处理可增强碳纤维与树脂之间的界面粘合力,从而显著改善碳纤维增强聚酰胺 6 复合材料的机械性能。表面改性提高了碳纤维的表面化学活性。复合材料的机械性能显著提高。揭示了复合材料的界面性能增强机理。
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来源期刊
Polymer Composites
Polymer Composites 工程技术-材料科学:复合
CiteScore
7.50
自引率
32.70%
发文量
673
审稿时长
3.1 months
期刊介绍: Polymer Composites is the engineering and scientific journal serving the fields of reinforced plastics and polymer composites including research, production, processing, and applications. PC brings you the details of developments in this rapidly expanding area of technology long before they are commercial realities.
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