Composite fluoropolymer films with different surface energies

Some embodiments of the present disclosure relate to a composite film. In some embodiments, the composite membrane includes a first fluoropolymer membrane and a second fluoropolymer membrane. In some embodiments, the difference between the second surface energy of the second fluoropolymer film and the first surface energy of the first fluoropolymer film is at least 10 mN/m at 20 DEG C. In some embodiments, the composite film has a Z strength of at least 5 psi. 本公开的一些实施方式涉及到一种复合膜。在一些实施方式中，该复合膜包括第一含氟聚合物膜和第二含氟聚合物膜。在一些实施方式中，第二含氟聚合物膜的第二表面能与第一含氟聚合物膜的第一表面能之间的差异在20℃下为至少10mN/m。在一些实施方式中，该复合膜具有至少5psi的Z强度。