Why is the temperature raised in order to achieve crystallization in PET? Is that temperature higher or lower when the PET has been oriented?
What will be an ideal response?
In any material, especially one in which the polymer repeating unit is large, energy must be added to the system to allow sufficient molecular motion to align the molecules for crystallization. This is known as the thermodynamic limit of crystallization. If the polymer is oriented, some induced bonding has been created that gives the structure stability. Therefore, to rearrange into crystals, more energy must be added than if the polymer were amorphous. Therefore, the oriented polymers require higher temperatures to crystallize than the nonoriented polymers.
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