Shrinkage forces and birefringences of an amorphous stretched copolyterephthalate

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Abstract
Measurements of shrinkage stress and birefringence have been undertaken on drawn samples of a copolyterephthalate based on ethylene glycol and 1,4 cyclohexane‐dimethanol. The temperature location and the peak value of the maximum shrinkage stress have been related to the drawing conditions (temperature, strain rate and draw ratio), comparing the results with those reported for poly (ethylene terephthalate). Moreover, a value of the stress optical coefficient of the copolymer equal to 14.5 × 10−9 m2 N−l has been obtained.

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