Effects of different morphologies and contents of polytetrafluorethylene (PTFE) on the foaming and rheological behavior of thermoplastic polyurethane (TPU) and mechanical properties of TPU/PTFE composite foams were investigated. High-pressure rheological test results showed that fibrillated PTFE had a more significant effect on the reinforcement of TPU than PTFE particles. In addition, the TPU/fibrillated PTFE composite foam exhibited good compression recovery properties, and its compressive strength was 109% that of TPU/PTFE composite foam with PTFE particles. Furthermore, with increasing PTFE content, TPU/PTFE foams exhibited higher compressive strength and good compression recovery properties. Retention of maximum stress was approximately 90%, and the strain recovery rate of the TPU/PTFE foam was approximately 80% of the initial value after 50 compression cycles. Moreover, the shrinkage ratio of the TPU foam decreased with increasing PTFE content, and fibrillated PTFE enhanced the hydrophobicity of TPU.

研究了不同形态和含量的聚四氟乙烯（PTFE）对热塑性聚氨酯（TPU）的发泡和流变行为以及TPU / PTFE复合泡沫的力学性能的影响。高压流变测试结果表明，原纤化PTFE对TPU的增强作用比PTFE颗粒更为显着。另外，TPU /原纤化PTFE复合泡沫材料显示出良好的压缩回复性能，其压缩强度为具有PTFE颗粒的TPU / PTFE复合泡沫材料的压缩强度的109％。此外，随着PTFE含量的增加，TPU / PTFE泡沫表现出更高的压缩强度和良好的压缩回复性能。最大应力保持率约为90％，50次压缩循环后，TPU / PTFE泡沫的应变恢复率约为初始值的80％。此外，随着PTFE含量的增加，TPU泡沫的收缩率降低，而原纤化的PTFE增强了TPU的疏水性。