小形变下聚氨酯/聚氨基甲酸酯纤维复合材料的增强和阻尼性

利用聚氨基甲酸酯纤维织物、3,3′-二氯-4,4′-二氨基二苯基甲烷(MOCA)分别与聚丙二醇(PPG)型预聚体和聚四氢呋喃醚二醇(PTMG)型预聚体经浇注一体成型制备聚氨酯/聚氨基甲酸酯纤维复合材料，研究了聚氨基甲酸酯纤维织物对聚氨酯基体小形变下的抗张应力和阻尼性能的影响。结果表明，聚氨基甲酸酯纤维织物对聚氨酯基体小形变下的抗张应力和阻尼性能均具有明显的增强作用；与各自基体相比，PPG型和PTMG型复合材料的弹性模量分别提高了16.33 %和11.39 %，其 100 %定伸应力分别提高了55.81 %和46.51 %；而且二者的一次拉伸回复滞后率分别高达55.10 %和62.83 %，较各自基体分别提高了26.12 %和14.03 %。

Enhancement and Damping Property of Polyurethane/Spandex Composites Under Small Deformation

In this paper, spandex fabric 4,4′-methylene bis (MOCA) and polypropylene glycol (PPG) prepolymer or polytetrahydrofuran ether glycol (PTMG) prepolymer was casting molded forming polyurethane/spandex composites. The effect of spandex fabric on the tensile strength and damping properties of polyurethane matrix under small deformation was studied. It was shown that spandex fabric could strengthen the tensile strength and damping properties of polyurethane matrix under small deformation. After compounding, the modulus of elasticity of PPG and PTMG composites was increased 16.33 % and 11.39 %，and the tensile stress at 100 % deformation of PPG and PTMG composite was increased 55.81 % and 46.51 %. Moreover, the lag rate after 1 time stretching retraction cycle of these two composites was 55.10 % and 62.83 %, compared with the matrix, the value was enhanced 26.12 % and 14.03 %, respectively.