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What are the effects of crystallinity on the properties of Polymers?

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the higher the crystallinity, the better the tensile property, chemical solvent resistance and heat resistance. But the impact resistance will be worse.

due to the regular and close arrangement of molecular chains in the crystallization area
large intermolecular force
difficult chain movement
therefore, the melting point
density
strength
stiffness
heat resistance
solvent resistance
barrier property of the polymer increases with the increase of crystallinity
while some performance indexes depending on chain activity
such as elasticity
elongation at break
impact resistance decreases with the increase of crystallinity

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