在分散型聚四氟乙烯树脂（PTFE）中混入热塑性弹性体聚氨酯（TPU），采用二次双向拉伸制备了具有良好弹性的多微孔薄膜，并对薄膜进行弹性性能测试及透射电镜（TEM）和 表面扫描电镜（SEM）观察。结果表明：TPU在PTFE中能够均匀掺混，经二次双向拉伸后PTFE 形成了网状结构，TPU依附在PTFE纤维上也被拉伸成细小纤维，二者共同形成了多微孔薄膜，而且TPU的加入有效地改善了PTFE薄膜的弹性性能。

The blend membranes were prepared by introduction of TPU into a dispersive resin PTFE. The morphology and thermal properties of the blends, and the rebound elasticity of the membranes were studied. The transmission electron microscopy(TEM) shows that the TPU is fine dispersed in the blends. The scanning electron microscopy (SEM) micrographs exhibit multi-microporous structures of biaxial stretching P TFE/TPU membranes. The PTFE and the TPU of the membranes were stretched into small fibers. The rebound elasticity of biaxial stretching PTFE/TPU membranes was st udied. The results show that the rebound elasticity and tensile elongation of PT F E membranes are both improved with the increasing of TPU.