DENSE ARTICLES FORMED FROM TETRAFLUOROETHYLENE CORE SHELL COPOLYMERS AND METHODS OF MAKING THE SAME

摘要

Core / shell tetrafluoroethylene (TFE) having a first endotherm temperature of about 50 ° C. to about 300 ° C., a second endotherm temperature of about 320 ° C. to about 350 ° C., and a third endotherm temperature of about 350 ° C. to about 400 ° C. ) There is provided a high density article comprising a copolymer film. In exemplary embodiments, the third endothermic temperature is approximately 380 ° C. In some embodiments, the second endotherm is about 320 ° C. to about 330 ° C. or about 330 ° C. to about 350 ° C. TFE copolymer films have a methane transmission of less than about 20 μg * micron / cm 2 / min. In addition, the high density article has a pore volume of less than about 20%. High density articles are made by densifying the TFE copolymer film and optionally further stretching. High density articles exhibit improved physical and mechanical properties such as adhesion and barrier properties.