弹性聚四氟乙烯／聚氨酯复合薄膜性能的研究

Study on Properties of Polytetrafluoroethylene/Polyurethane Membranes with Rebound Elasticity

在聚四氟乙烯树脂（PTFE）中加入热塑性弹性体聚氨酯（TPU），制备出了有弹性的微孔复合薄膜，有效地改进了唧双向拉伸薄膜受力后的回复性。在复合薄膜中，加入经偶联剂处理的纳米二氧化硅，有利于TPU在PTFE中的均匀分散，从而提高复合薄膜的弹性。随着TPU含量的增加薄膜回复性也提高，双向拉伸倍率的增大可以导致薄膜回复性能有所下降，SEM分析证明了在PTFE中加入TPU可以增大复合薄膜的微孔尺寸。

Membranes of multi-microporous structure with rebound elasticity are prepared by introducing thermoplastic polyurethane （TPU） into polytetrafluoroethylene（PTFE）, which improves the rebound elasticity of PTFE biaxial stretching membrane after stressed. Addition of nano-SiO2 treated by coupling agent is propitious that TPU disperses into PTFE equably, consequently the rebound elasticity of the membrane is enhanced. The composition of the blend membrane and the biaxial stretching ratio have some effect on the rebound elasticity. The results of scanning electron microscopy （SEM） show the factor above-mentioned that affects the microstructure is the reason of the different rebound elasticity. SEM also shows addition of TPU into PTFE increases the pore size of the blend film.