What are the effects of stretch ratio and temperature on ptfe biaxially stretched film?

Stretching ratio and stretching temperature have obvious effects on the tensile strength and elongation at break of ptfe biaxially stretched film. Compared with unstretched polytetrafluoroethylene tape, the strength of the film is doubled.

The tensile strength of polytetrafluoroethylene microporous membrane increases as the stretching temperature increases, while the elongation at break of the microporous membrane decreases as the stretching temperature increases.

This is because as the stretching temperature increases, the molecular chain mobility becomes higher, the wafer becomes easier to unwind, and the orientation of the microfibers in the film becomes higher.

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