橡胶改性对硼纤维/环氧单向复合材料力学性能的影响

对环氧树脂进行液体丁腈橡胶改性, 并采用缠绕无纬布层压成型工艺制备了硼纤维/环氧单向复合材料。测试了环氧树脂液体丁腈橡胶改性前后硼纤维/环氧单向复合材料的力学性能, 研究了硼纤维/环氧单向复合材料的纵向拉伸破坏模式。结果表明, 基体中的10%液体丁腈橡胶使硼纤维/环氧单向复合材料的拉伸强度、 弯曲强度、 层间剪切强度和断裂延伸率分别提高了18.42%、 13.39%、 28.45%和43.40%, 但其拉伸和弯曲模量稍有下降。基体中含10%液体丁腈橡胶的硼纤维/环氧单向复合材料的纵向拉伸破坏模式为界面层的内聚破坏和脱黏破坏共存的混合破坏。 

Effect of liquid nitrile-butadiene rubber on mechanical properties of unidirectional boron fiber/epoxy resin composites

Epoxy resin was modified with liquid nitrile-butadiene rubber (LNBR), and unidirectional boron fiber/epoxy resin (Bf/epoxy) composites were fabricated with compression molding. Mechanical properties of the composites without and with 10% LNBR were tested. Failure modes of the unidirectional Bf/epoxy composites without and with 10% LNBR under tensile loads were studied by observing their macro- and micro-fracture surfaces. The results show that 10% LNBR increases the tensile strength, bending strength, interlaminar shear strength and elongation to fracture of the unidirectional Bf/epoxy composite by 18.42%, 13.39%, 28.45% and 43.40% , respectively, while there is a decrease of the tensile modulus and bending modulus. The failure mode is of a mixed fracture mode between cohesion failure and debonding failure on the fracture surface of the unidirectional Bf /epoxy composite with 10% LNBR.