Abstract
While viscose rayon is stretched at various temperatures and extensions in water, the dynamic tensile Young's modulus and viscosity are measured by the free vibrtaional method (the period and the maximum amplitude are about 4_??_6 seconds and 1.5 per cent, respectively).
The effects of the temperature and stretching on such properties are obtained as follows:
1. The viscoelasticities of the sample, immersed in water at various temperatures, are linear at low extension, but non-linear at high extension. The non-linear viscoelasticity can be analysed by the differencial equation, which was applied in the previous paper. This phenomenon results from the breakage and reforming of hydrogen bond by the vibration.
2. At low extension, the dynamic viscocity decreases with the increasing temperature (25°C_??_40°C or 50°C) but does not change at the range of higher temperature (40 or 50°C_??_100°C). No change of the dynamic modulus is obtained for the above temperature ranges examined.
3. The dynamic modulus increases with stretching but has no dependence on temperature.
4. The dynamic viscosity increases with stretching and has remarkable dependences on temperature. From the above results it may be concluded, that the viscose rayon has a characteristic range of temperature (40°C_??_50°C) at low stretching in water, but this range of temperature disappears at high stretching.
