Abstract

AbstractA study of molecular orientation in drawn and shrunk poly(ethylene terephthalate) was undertaken at 80°C and 120°C for samples drawn at (i) 80°C (homogeneous deformation) and (ii) two‐stage drawing: a homogeneous pre‐orientation at 80°C, followed by cold drawing at 20°C. The results (birefringence, residual shrinkage ratio, crystallinity) are discussed in terms of molecular disorientation in the noncrystalline region which occurs upon the shrinkage process.

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