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针对复合材料成型工艺条件下环氧树脂与碳纤维表面的物理化学作用,研究了不同温度下E51树脂以及E51/DDS、E51/咪唑树脂体系的表面张力,E51树脂与T700纤维单丝的接触角;并考察了E51树脂在T700纤维束表面的初始表观接触角。进而对比分析了升温过程中T700纤维与E51/DDS树脂体系的浸润特性,计算出纤维与树脂体系的热力学粘附功,考察了工艺温度条件下纤维与树脂体系的粘附特性。结果表明,升高温度、降低树脂黏度可有效改善纤维与树脂的浸润特性,树脂的黏度作用尤其显著。在树脂体系发生化学反应之前,升温对纤维/树脂粘附特性的促进作用较不明显。
In this paper, the surface tension of E51 resin, E51 / DDS, E51 / imidazole resin system and the contact angle between E51 resin and T700 fiber monofilament were studied at different temperatures for the physicochemical interaction between epoxy resin and carbon fiber surface. The initial apparent contact angle of E51 resin on the surface of T700 fiber bundle was investigated. Furthermore, the infiltration characteristics of T700 fiber and E51 / DDS resin system during heating were compared. The thermodynamic adhesion work of fiber and resin system was calculated. The adhesion characteristics of fiber and resin system were investigated. The results show that increasing the temperature and decreasing the viscosity of the resin can effectively improve the wetting properties of the fiber and the resin, and the viscosity of the resin is particularly significant. Prior to the chemical reaction in the resin system, the effect of temperature increase on the fiber / resin adhesion characteristics was less pronounced.