【摘要】 研究了等离子体表面改性和等离子体接枝改性碳纤维/环氧树脂基复合材料界面的不均匀性。层间剪切强度(ILSS)测量及其偏差评估的结果表明，在相同等离子体条件下，等离子体表面改性对ILSS的提升率只有8.6%，而等离子体接枝改性的提升率高达37%；但是，接枝改性ILSS的离散程度比较高。扫描电镜、金相显微镜和红外光谱分析的结果进一步表明，接枝改性可通过取代反应将较多的活性基团键接在碳纤维表面从而更容易实现界面提升，但是接枝层的不均匀及其产生的纤维粘连使ILSS的离散程度提高。更多还原

【Abstract】 The effect of plasma surface modification and plasma grafting modification on the inhomogeneity of interfacial properties of the modified carbon fiber/epoxy composites was comparatively studied by means of interlaminar shear strength(ILSS) test, metallography, SEM, attenuated total reflection-Fourier transform infrared spectroscopy(ATR-FTIS) in terms of the relevant affecting factors. Firstly, the interlaminar shear strength(ILSS) of the composites was measured and its variation was evaluated.Results showed that the enhancement rate of ILSS by plasma surface modification was only 8.6%, while that by plasma grafting was 37% by the same plasma treatment conditions. However, compared with the plasma surface modification, the plasma graft modification aggravated the dispersion of ILSS. Then the surface morphology and the adhesion situation to the resin matrix of the carbon fibers modified by the two methods were studied by scanning electron microscope and metallographic microscope, respectively. Fourier transform infrared spectroscopy was used to reveal the chemical reactions on the fiber surface. The results showed that compared with the plasma surface modification, the plasma grafting modification could graft more active groups onto carbon fibers through substitution reaction, which may result in the improvement of interfacial properties. However, due to the inhomogeneity of grafting layer, which may cause the increase of the fiber adhesion and aggregation, thereby the ILSS dispersion of composites after grafting modification was expanded. Therefore, the control of plasma grafting modification on the homogeneity of interfacial property for composites deserves more attention. This study can provide some theoretical guidance for composite interface modification and its homogeneitycontrol.更多还原