热塑性聚氨酯/马来酸酐接枝聚丙烯微孔发泡材料的制备与力学性能

Preparation and Mechanical Properties of Thermoplastic Polyurethane/Maleic Anhydride Grafted Polypropylene Microcellular Foaming Materials

采用超临界二氧化碳发泡一步泄压法制备热塑性聚氨酯/马来酸酐接枝聚丙烯(TPU/PP-g-MAH)微孔发泡材料。通过对PP-g-MAH与TPU分子间相互作用机理的深入研究,发现PP-g-MAH与TPU分子链间存在的强烈氢键作用有利于提高TPU发泡材料的孔隙率。添加质量分数3%的PP-g-MAH即可制备低密度(0. 1 g/cm^3)、大发泡倍率(ER>10)的TPU微孔发泡材料。经10次压缩-回复循环测试后,所有样品的最大压缩应力的保持率均大于80%,表现出良好的弹性和形状稳定性。

Thermoplastic polyurethane/maleic anhydride grafted polypropylene(TPU/PP-g-MAH) microcellular foaming materials were prepared by supercritical carbon dioxide(scCO2) foaming method.Through in-depth research of the interaction mechanism between PP-g-MAH and TPU molecules,it was found that strong hydrogen bonds between PP-g-MAH and TPU molecular chain was beneficial to improve the porosity of TPU foaming materials.When the addition of PP-g-MAH was 3%,the TPU microcellular foaming materials with low density(0.1 g/cm^3) and high foaming ratio(ER> 10) could be prepared.After ten compression-recovery cycles,the retention of maximum compressive stress of all samples were greater than 80%,which could show good elasticity and shape stability.