湿熱および乾熱処理によるナイロン6タイヤコードの強力および微細構造変化の研究
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Nylon 6 tire cords and filaments were steam-and dry-heat treated under tension or tensionless state at temperatures ranging from 20°C to 230°C for 2 hours.<BR>Tensile strength, intrinsic viscosity, specific gravity and X-ray wide angle diffraction were measured. The following results were obtained.<BR>Steam-heat treatment under tension.<BR>1. The tensile strength decreased markedly by treatments above about150°C.<BR>2. Intrinsic viscosity decreased with increasing temperature.<BR>3. The degree of crystallinity increased with the increase of treating temperature from20°C to 155°C, then decreased at higher temperatures than this.<BR>The degree of crystallinity of the specimen melted at 162 °C showed the smallest value.<BR>4. X-ray patterns of nylon 6 filaments were changed by the treatment. The degree of orientation indicated no changes with increasing temperature under tension, but markedly decreased under tensionless state.<BR>Dry-heat treatment under tension.<BR>1. The tensile strength decreased by treatments above about200°C.<BR>2. The intrinsic viscosity decreased gradually with increasing temperature.<BR>3. The degree of crystallinity increased with increasing temperature.<BR>4. In the dry-heat treatment under tension or tensionless state, changes of X-ray patterns and degree of orientation were smaller than those in steam-heat treatment.<BR>It was concluded from these results that the effects of steam-heat treatment on fine structure and tensile strength of nylon 6 tire cords were stronger than those of dry-heat treatment.
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