【摘要】 采用模压方法制备纺织结构碳纤维增强尼龙6(CFF/PA6)复合材料,研究了不同成型工艺下制备的复合材料的结构与力学性能。基于对PA6树脂基体的DSC分析,以及对不同温度下制备的复合材料进行外观形貌对比,确定最佳成型温度为250℃;调节模压成型压力,制备一系列CFF/PA6复合材料,并借助以下表征手段对复合材料结构与性能进行评价:采用静力学实验测试CFF/PA6的拉伸、弯曲和冲击强度,分析强度与韧性随成型压力的变化规律;采用密度法对CFF/PA6复合材料进行孔隙率测试,考察CFF/PA6复合材料模压成型压力对孔隙率的影响;借助扫描电子显微镜观察CFF/PA6复合材料的断面形貌。基于实验结果,最终确定CFF/PA6复合材料的模压成型压力为2.5~3 MPa。在该条件下制备的CFF/PA6复合材料,冲击强度、弯曲强度和拉伸强度分别为67 k J/m2、603.94MPa和321.82 MPa。更多还原

【Abstract】 In this study,carbon fiber fabric reinforced nylon 6( CFF / PA6) composites were prepared by compression molding processing. The structure and mechanical properties of the composites prepared in different processing conditions were investigated. Based on the differential scanning calorimetry( DSC)analysis for PA6 matrix and comparison of extrinsic features of the composites prepared at different temperatures,the optimized processing temperature of 250 ℃ was determined. A series of composites under various processing pressures were prepared and evaluated via the following characterizations: mechanical tests for tensile and bending and impact strength to analyze the strength and toughness changing with processing pressures,densitometric method for porosity to study the effect of processing pressures on the porosity of the composite,and scanning electron microscopy used to observe the cross section morphology of the composite.Based on experimental results,the optimal molding pressure was between 2. 5 MPa and 3 MPa. CFF / PA6 composite prepared in this condition exhibited the impact strength of 67 k J / m2,the bending strength of603. 94 MPa and the tensile strength of 321. 82 MPa.更多还原