Effect of Preheat Treatment on Carbon Fiber Surface Properties and Fiber/PEEK Interfacial Behavior
Effect of Preheat Treatment on Carbon Fiber Surface Properties and Fiber/PEEK Interfacial Behavior
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DOI：
10.1002/pc.25020
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发表时间：
2019-03-01
影响因子：
5.2
通讯作者：
Zhao, Yan
中科院分区：
文献类型：
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作者：
Li, Na;Chen, Junlin;Zhao, Yan
本文详细研究了预热处理对碳纤维(CF)表面性能及碳纤维增强聚醚醚酮(CF/PEEK)复合材料界面性能的影响。根据热塑性复合材料的实际工艺条件，对T700SC碳纤维进行了预热。由于浆料的降解，浆料的质量损失明显。傅立叶变换红外光谱和X射线光电子能谱分析表明，预热处理后的纤维浆料中施胶剂和活性碳原子的浓度明显降低。预热处理对拉伸强度影响不大。在偏光显微镜下观察到纤维/PEEK界面的穿晶结构，预热处理前后纤维/PEEK界面的穿晶密度相近。通过微观粘结试验测定了纤维与聚醚醚酮基体之间的界面剪切强度。IFSS从40.16增加到46.32 Mpa，增加了15.34%，与活性碳原子的趋势相反。此外，还探讨了界面粘结增强的机理。由于施胶剂与PEEK之间的化学结合较差，施胶层成为弱界面区域。通过预热处理去除浆料可以提高界面粘附性。(三)2018年塑料工程师学会
In this work, the effect of preheat treatment on surface properties of carbon fiber (CF) and interfacial properties of CF-reinforced polyether ether ketone (CF/PEEK) composites was investigated in detail. The sized T700SC CFs were preheated based on practical thermoplastic composites processing conditions. The obvious mass loss was obtained due to the sizing agent degradation. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy demonstrated that the concentration of sizing agents and activated carbon atoms decreased apparently for preheated fibers. Pre-heat treatment had negligible effect on tensile strength. Transcrystallinity structures were observed at fiber/PEEK interfaces using polarizing microscope and they had similar transcrystallinity density before and after preheat treatment. The microbond test was performed to determine interfacial shear strength (IFSS) between fibers and PEEK matrix. The IFSS increased from 40.16 to 46.32 MPa by 15.34%, which was against the trend of activated carbon atoms. Furthermore, the mechanisms of interfacial adhesion enhancement were discussed. The sizing layer became weak interface region because of poor chemical bonding between sizing agents and PEEK. Removing sizing via preheat treatment could enhance the interfacial adhesion. (C) 2018 Society of Plastics Engineers