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设计了一种新的梯度组分分布数学模型,采用梯度因子和梯度层数控制梯度组分的分布,并采用逐层浇铸的方法制备了聚氨酯(PU)/环氧(EP)梯度互穿网络聚合物(IPNs)材料,研究了其微观形貌和力学性能。研究结果表明,随着梯度组分含量沿梯度方向的变化,不同梯度单层的相结构和断裂特性也呈现相应的变化,逐渐由分散相向连续相转变。从中心层到表面层,梯度单层的弯曲模量逐层降低,挠度逐层增大,梯度IPNs的弯曲强度和模量低于普通IPNs,抗冲击性能高于普通IPNs。
A new mathematical model of gradient component distribution was designed. Gradient factors and gradient layers were used to control the distribution of gradient components. Polyurethane / epoxy (EP) gradient interpenetrating networks Polymers (IPNs) materials were synthesized and their microstructures and mechanical properties were studied. The results show that the phase structure and fracture characteristics of different gradient monolayers change correspondingly with the content of gradient components along the gradient direction, and gradually change from dispersed phase to continuous phase. From the center layer to the surface layer, the flexural modulus of the gradient monolayer decreased gradually and the deflection increased gradually. The flexural strength and modulus of gradient IPNs were lower than those of ordinary IPNs, and the impact resistance was higher than that of ordinary IPNs.