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.
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Micromechanism Study of Molecular Compatibility of PVDF/PEI Blend Membrane.
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