定型剂对单轴向经编织物复合材料力学性能影响的试验研究

研究了真空辅助树脂注射（VARI）工艺中定型剂对环氧树脂的影响及其在织物表面的分布形式，以及定型剂用量对单轴向经编织物复合材料力学性能的影响，以确定最优的定型参数。采用示差扫描量热法（DSC）和扫描电镜（SEM）分别对加入不同用量定型剂的环氧树脂的玻璃化转变温度和相形貌进行分析，并测试了加入不同用量定型剂后复合材料的力学性能。结果表明：随着定型剂用量的增加，环氧树脂的玻璃化转变温度逐渐降低，且其相形貌逐渐由海岛结构经过双连续相结构到最后的相反转结构；室温下，随着定型剂用量的增加，织物表面定型剂的厚度及不均匀性增加，经过高温处理后，定型剂均匀分布在织物表面。定型剂用量对单轴向经编织物复合材料力学性能有较大影响，用量为20 g/m²时，复合材料体系的综合力学性能最优。

Experimental study on effects of tackifier on mechanical properties of composites reinforced by uniaxial warp-knitting fabrics

In order to choose the best parameters of tackifier in vacuum assisted resin infusion (VARI) processing, the distribution of tackifier on fabrics, effects of different addition levels of tackifier on epoxide resin and mechanical performance of composites reinforced by uniaxial warp-knitting fabrics were investigated. Effects of addition levels of tackifier on the glass transition temperature and phase configuration of epoxide resin were analyzed by differential scanning calorimetry (DSC) and scanning electron microscope (SEM). Mechanical performances of composites with various amounts of tackifier were examined. It is shown that as the addition level of tackifier increases, the glass transition temperature of epoxide resin decreases, and its phase configuration transferred from sea island structure to double continuous-phase, then, at last to phase inversion structure. At room temperature, the thickness and irregularity of tackifier on surface of fabrics were increasing with increasing tackifier. After high-temperature processing, the tackifier have uniformly distributed onto the surface of fabrics. Addition levels of tackifier have significant effects on the mechanical properties of composites. The comprehensive mechanical properties of composites reinforced by uniaxial warp-knitting fabrics reach the best when the addition level of tackifier remains at 20 g/m².