碳纤维增强可溶性聚芳醚树脂基复合材料的表面与界面

首次对碳纤维增强含二氮杂萘酮联苯型聚芳醚砜酮(PPESK)基高性能热塑性树脂基复合材料的界面进行了研究。采用空气冷等离子体处理方法对碳纤维表面进行处理。用XPS测试分析了不同等离子体处理时间对CF-原丝表面元素组成的影响及其变化规律。用FT-IR测试分析了经等离子体处理前后碳纤维表面的官能团的变化。采用动态接触角测试分析了不同处理时间下,碳纤维浸润性的变化规律,进一步分析了复合材料界面的粘结机理。采用AFM测试分析等离子体处理时间对碳纤维表面粗糙度的影响。利用ILSS测试方法表征了碳纤维/PPESK复合材料的层间剪切强度,确定了最佳的等离子体处理条件。利用SEM观察了碳纤维/PPESK树脂基复合材料的层间剪切破坏形貌。结果表明:对碳纤维的最佳的等离子体处理条件为:处理功率200W,处理时间15m in。在这一条件下处理碳纤维,复合材料的ILSS值最达可提高13.5%。经过适当的等离子体处理后,碳纤维表面的极性基团的含量、浸润性能和粗糙度均得到改善,增强纤维与树脂基体间界面的粘结性能得到提高,从而提高了复合材料的力学性能。

The surface and interface of carbon fiber-reinforced soluble PPESK composite

First,this work studied the interfacial properties of higher performance carbon fiber/PPESK thermoplastic composites.The fiber/matrix interface was treated by cold air plasma.The elements on the carbon fibers surface with different plasma treatment time were also examined by XPS.The functionality of the carbon fiber after plasma treatment were characterized by Fourier transform infrared spectroscopy(FTIR).Contact angle analyses were performed on carbon fibers with different plasma treatment time to well understand the mechanism of adhesion in carbon fiber/PPESK composites.The surface roughness of carbon fibers were analyzed by Atomic force microscopy(AFM).Interlaminar shear strength(ILSS) of the CF/PPESK composite were measured to confirm the optimum plasma treatment conditions.The fracture surfaces of carbon fiber/PPESK composites were investigated by scanning electron microscopy(SEM).The results show that: The ILSS of carbon fibers/PPESK composites was improved by 13.5% under the optimum plasma treatment conditions of 200W and 15 min.After plasma treatment,interfacial adhesion can be enhanced by improving wet ability,increasing surface roughness and polar functional groups content on the surface,which reinforces the mechanical properties of the composite.