链长对炭纤维/聚芳基乙炔复合材料界面性能的影响

采用在炭纤维表面接枝含有不同链长的偶联剂的方法, 研究了链长对炭纤维/聚芳基乙炔复合材料界面性能的影响。纤维和树脂的浸润性通过纤维表面能的测定以及纤维表面能和浸润性的讨论进行了评价。通过复合材料界面剪切强度测试以及断口形貌分析对炭纤维/聚芳基乙炔复合材料的界面性能进行了研究。结果表明, 随着炭纤维表面链长的增长, 炭纤维/聚芳基乙炔复合材料的界面粘结性能随之提高。界面粘结性能的提高主要归因于接枝于炭纤维表面的偶联剂的分子链和聚芳基乙炔树脂分子链发生了物理缠结作用, 并且这种缠结作用随着纤维表面分子链的长度的增加而增强。 

Influence of chain lengths on interfacial performances of carbon fiber reinforced polyarylacetylene resin composites

Through the method of grafting coupling agents with different chain lengths onto the surface of carbon fiber, the influence of chain lengths on interracial performances of carbon fiher/polyarylacetylene composites was studied. Surface energy of carbon fiber before and after treatment was measured and the relation between surface energy and fiber wettahility was discussed. At the same time, the interracial adhesion was evaluated by interlaminar shear strength, and the failure mechanisms of composites were analyzed by fracture morphologies. The results indicate that with the increase in chain lengths of coupling agents on the carbon fiber surface, the interracial adhesion of composites increases greatly. The main mechanism responsible for the improvement of interracial adhesion is the entanglement interaction between the molecular chain of coupling agent on carbon fiber and the counterpart of polyarylacetylene resin at the interface. Moreover, the longer the chain length on the carbon fiber surface, the stronger the entanglement at the composite interface.