Stress relaxation in regenerated cellulose

Publisher Website
Google Scholar
Abstract
Stress relaxation measurements on single fibres of regenerated cellulose (viscose), which had a low degree of anisotropy, are described. These were made in the temperature range +20 to −185°C for the time interval 003 to 1000 s using tensile strains of the order of 03%. The results are discussed in relation to existing reaction rate theories, and it is concluded that they cannot be explained in terms of such theories if only a single relaxation process is considered. A distribution of activation energies can be derived from the data if the system is regarded as approximately linear. A modified Ferry transform is used for this purpose, the theory of which is discussed. The distribution so derived is bimodal and corresponds approximately to fully bonded glucose rings moving singly and in pairs. Measurements on other hydrogen-bonded systems may help to establish the validity of this result.

This publication has 13 references indexed in Scilit: