ナイロン6繊維の熱固定過程におけるX線的変化

抄録

The wide angle diffraction diagrams of X-ray of nylon 6 were observed at high temperature. The X-ray diffraction apparatus was constructed, in which the samples could be kept at any temperature between room temperature and 300°C. A pre-heat-set sample was prepared by heatsetting at fixed length in the electric oven.
In the case of the non-heat-set sample, two diffraction peaks on the equator approached gradually by heating and overlapped each other at 120°C, and its spacing was essentially identical with the spacing of the cylindrical hexagonal structure, 4.3A. The sample heated up above 140°C gives hexagonal pattern, but when the sample was cooled down, the two peaks of diagram separated at 120°C and gave the typical pattern of nylon 6 after cooling down to room temperature.
In the case of the pre-heat set samples, two peaks overlapped with each other at higher temperature than in the non-heat-set sample. But when the samples were heated up above 180°C, regadless of the pre and non-heat-set temperature, two peaks of diagram separated from one peak.
The effect of heat-setting on the fine structure of nylon 6 fibers is discussed in the relation to the physical behaviors.