Abstract
In the previous paper, the heat-treatment process and viscoelastic properties of the drawn poly-propylene filaments were studied in relation to the heat-treating temperature. It was shown that the change of stress was the unique function of temperature when the samples were kept at a constant drawn length at temperatures below the heat-treating temperature. The change of stress of the drawn and heat-treated nylon-6 filaments was not neccessarily represented as a function of temperature only, but also depended on the abrupt incaease of decrease of the temperature. When the temperature was incereased suddenly from the the room temperature to a given temperature, the stress change of the samples kept at the drawn length was measured as a function of time to obtain the following results:
1) The reduced stress as a function of time is represented by the following equation for the drawn and heat-treated samples. ΔH(=11.24kcal/mal), Tq(=-29°C) and exp Bq(=1.315) are constants. AT0, and Bc, (which depend on draw ratios and heat-treating temperatures) are also constants.
2) As the coefficient of time in eq. (1) follows the Arrhenius' equation, the apparent activation energy ΔH is obtained, which depends on neither draw ratios nor heat-treating temperature.
