Abstract
Changes in the structure of doubly oriented nylon 6 film, which was prepared by cold drawing of a film with low moisture content, was studied by X-ray and birefringence measurements. Theoretical values of birefringence were calculated for α- and γ-forms of the crystal and were used to analyse the experimental results.Birefringence data indicated that the transition from paracrystalline to α-form crystals with improved orientation of the planes of CH2 zigzag chains should be regarded as important, in addition to the increase in crystallinity by heat treatment. The orientation of hydrogen bonds was not appreciably affected by annealing. X-Ray data showed that the unstable, pseudo-hexagonal structures in the as drawn film continuously approached the stable α-form. It has been concluded that the unstable structure should be related to the α-form crystal.
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