It should be pointed out that in the SEM images of the composite films with graphene content of 3,4 and 5, aggregates and granular surfaces are obviously observed in the areas without scratches, especially in the composite films with graphene content of 5%, there are a large number of micropores, and then at the scratches, it is obvious that the resin is filled in the scratches, and the repaired scratches are smooth and compact.
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