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“showed a trend”

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In the literature

The PANI occupancy on the fiber surface showed a trend of increasing and then decreasing, indicating that increasing the amount of PANI added helped to increase the number of PANI molecules on the fiber surface, but when the addition of PANI caused a significant increase in solution viscosity, the decrease in molecular migration ability was more critical.
Along with the increase in the content of PEI in the elongation at break and the most strong overall showed a trend of decrease after the first increase, this is because the PVDF is a kind of vinyl semicrystalline material, so as the polar materials are added to a certain amount, the main chain rigidity reaches a certain degree, the interaction between the chain began to decrease, and the maximum force and elongation at break will decreased.