Effect of hybrid polysphosphazene coating treatment on carbon fibers on the interfacial properties of CF / PA6 composites
Effect of hybrid polysphosphazene coating treatment on carbon fibers on the interfacial properties of CF / PA6 composites
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DOI：
10.1002/app.49577
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发表时间：
2020-10
影响因子：
3
通讯作者：
Xiang Chen;Haibing Xu;Dong Liu;Chun Yan;Youqiang Yao;Yingdan Zhu
中科院分区：
文献类型：
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作者：
Xiang Chen;Haibing Xu;Dong Liu;Chun Yan;Youqiang Yao;Yingdan Zhu
碳纤维（CF）增强聚酰胺6（PA 6）复合材料具有广泛的应用。然而，CF/PA 6复合材料的性能受到CF/PA 6基体间界面结合力差的制约。为了提高CF/PA 6复合材料的界面结合力，采用原位聚合法在CF表面制备了一层含有大量PZS微球（PZS MS）的PZS杂化涂层。经表面改性后，纤维的表面形貌和表面化学结构发生了明显的变化。一方面，PADMS提供了更多的接触点，并增加了CF和PA 6基体之间的机械互锁。另一方面，由于改性后的CF表面含有大量独特的极性基团，使得CF与PA 6之间形成了大量的氢键。因此，与未处理的CF相比，CF-PPEMS/PA 6复合材料的界面剪切强度从37.68 ± 3.16 MPa提高到53.79 ± 3.38 MPa，提高了42.75 ± 3.02%。结果表明，纤维表面PZS杂化涂层有效地改善了CF/PA 6复合材料的界面粘结性能，其中氢键的增强和机械互锁的增强是主要的协同作用。
Carbon fiber (CF) reinforced polyamide 6 (PA6) composite has an extensive application. However, the performances of CF/PA6 composite are constrained by the poor interfacial adhesion between CF and PA6 matrix. In this article, in order to strengthen the interfacial adhesion of CF/PA6 composite, a layer of poly(cyclotriphosphazene‐co‐4,4′‐sulfonyldiphonel) (PZS) hybrid coating with plenty of PZS microspheres (PZSMS) was successfully introduced onto CF surface through facile in situ polymerization. After surface modification, the surface morphologies and the surface chemical structures of fibers changed distinctly. On one hand, the PZSMS provided more contact points and increased mechanical interlocking between CF and PA6 matrix. On the other hand, numerous hydrogen bonds between CF and PA6 were formed due to a great amount of unique polar groups on modified CF surface. Consequently, in comparison with untreated CF, the interfacial shear strength of CF‐PZSMS/PA6 composites was improved from 37.68 ± 3.16 to 53.79 ± 3.38 MPa, by 42.75 ± 3.02%. The results indicated that PZS hybrid coating on fiber surface effectively improved the interfacial adhesion of CF/PA6 composites, and the stronger hydrogen bonding and the enhanced mechanical interlocking synergistically played a major role in such significant improvements.