湿熱および乾熱処理によるナイロン6タイヤコードの赤外線吸収スペクトルによる研究

概要

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Nylon 6 films were steam-heat (148°C, 158 °C, 2 hours) or dry-heat (180 °C, 200 °C, 210 °C, 2 hours) treated. Infrared absorption spectra of each film were investigated. Following results were obtained. 1. In the dry-heated films, absorption bands were recognized at 1753 and 1735 cm-1, which were based on the carbonyl group C=O that had been formed by air oxidation, while such absorption bands did not appear in the steam-heat treated films. 2. The absorption band at 1660 cm-1 which appeared conspicuously in the parallel polarized beam, was recognized in both steam-and dry-heat treated films. The absorption band was considered to be derived from the C = C which was formed by main chain scission. 3. The 990 cm-1 absorption band (recognized by us at 970 cm-1) which had been named "Intermediate Structure" by Sandeman, remained even in a film dry-heated at 200 °C, but it completely disappearedin the films steam-heat treated at148°C or 158°C. 4. The intensities of the crystalline bands at 955 and 928 cm-1 increased by steam-or dry-heat treatment. These tendencies were in good agreement with the increase of specific gravity.
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