湿熱および乾熱処理によるナイロン6タイヤコードの広角および小角X線回折等による研究

概要

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Nylon 6 tire cords or filaments were steam-heat treated under tension at 158°C for 1 12 hours. Tensile strength, wide and small angle X-ray diffraction, melting point, intrinsic viscosity and specific gravity were measured. Following results were obtained. 1. Tensile strength of nylon 6 tire cords decreased with increasing steam-heat treatment time. 2. The size of crystallites obtained by X-ray wide angle diffraction markedly increased during 1 5 hours of the treatment, but indicated no further increases after 5 hours. 3. a : Long period obtained by X-ray small angle diffraction increased markedly during 1 5 hours of the treatment, then did gradually after 5 hours. In the dry-heat treatment, the increase of long period was smaller than that in steam-heat treatment. b : The melting point increased with increasing long period. c : Electron density differences of nylon 6 filaments increased with increasing treating time. 4. Intrinsic viscosity decreased markedly during 1 3 hours of the treatment, then did gradually after 3 hours. 5. Specific gravity was markedly increased for 1 5 hours and decreased after 5 hours. It was concluded from these results that the degradation of degree of polymerization and distinct change of fine structure of nylon 6 cause the decrease in tensile strength of nylon 6 tire cord.
日本ゴム協会の論文