Changes of Dimension and Molecular Orientation with Annealing and Boiling of Strip-biaxially Stretched Poly(ethylene terephthalate) Film.
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概要
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Poly (ethylene terephthalate) sheets were prepared by T die extrusion. PET sheets were then stretched at a draw ratio 4.0×1.0 using a biaxial stretcher. The stretched films were annealed at various temperatures for 5min. These annealed films were then boiled at 100°C for 1h. The dimensional changes of non-annealed and annealed films were explored after boiling at 100°C. Crystallinity measurements were undertaken to relate the dimensional changes for strip-biaxially stretched non-annealed, annealed and boiled PET films. Wide angle X-ray pole figures of strip-biaxially stretched non-annealed, annealed and boiled films were taken to study the preferential orientation of diffracted planes.
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