Within 50 times of bending test, with the increase of bending cycle, the sheet resistance of the film increases; After 100 and 150 bending cycles, the sheet resistance of the film decreased, but it was still higher than the initial sheet resistance of the film. Continue to increase the bending cycle test to 200, and the sheet resistance of the film will increase again. After that, with the increase of the bending test cycle, the sheet resistance of the film will not change much.
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