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Effect of acid-base properties of sized carbon fibers on fiber/epoxy matrix adhesion

机译：碳纤维的酸碱性能对纤维/环氧树脂基体附着力的影响

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The acid-base character of unsized ZoltekcircleR carbon fibers was investigated using dynamic contact angle analysis. The surface acid-base properties were characterized by calculating the work of acid-base interaction according to Fowkes' and Good's models. To evaluate the effect of sizing on carbon fiber surface properties, Ultem circleR (polyimide) and polyurethane sized fibers were studied and compared with unsized fibers. It was found that the sizing on the carbon fibers tended to reduce the surface energy and cover acid-base sites. The surfaces of unsized and sized carbon fibers were also analyzed by XPS to investigate changes in surface chemistry. XPS analysis indicated that hydroxyl groups on the fiber surface decreased with both sizings. These changes in chemistry were reflected in a decrease in both the polar and basic components of the surface energy of the fibers. Single fiber fragmentation testing of unsized and Ultem circleR and polyurethane sized fibers in an epoxy matrix showed that there is a direct effect of the surface chemical changes on fiber/matrix adhesion.
机译：使用动态接触角分析研究了未尺寸ZoltekcircleR碳纤维的酸碱特性。通过根据Fowkes'和Good's模型计算酸碱相互作用的功来表征表面酸碱性质。为了评估上浆对碳纤维表面性能的影响，对Ultem circleR（聚酰亚胺）和聚氨酯上浆纤维进行了研究，并与未上浆纤维进行了比较。发现在碳纤维上施胶倾向于降低表面能并覆盖酸碱位。 XPS还分析了未定尺寸和定尺寸的碳纤维的表面，以研究表面化学的变化。 XPS分析表明，两种上浆剂均会降低纤维表面的羟基。这些化学变化反映在纤维表面能的极性和碱性成分的减少上。在环氧基质中对未上浆的，Ultem circleR和聚氨酯上浆的纤维进行单纤维破碎测试表明，表面化学变化对纤维/基质粘附有直接影响。

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