ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Ethyl cellulose (EC) and hydroxypropyl cellulose (HPC) films were cast under different conditions and were observed optically. The creep behaviour of those films was determinedin vacuo as a function of applied stress or temperature and was analysed on the basis of the Eyring thermally activated process. EC and HPC films cast from liquid crystal-forming systems remained cholesteric liquid crystalline order (the cholesteric sense was different in each case), whereas EC film cast from non-liquid crystal system (benzene) had no liquid crystalline order and was amorphous. The Eyring activated process could be applied to the creep behaviour of our films and activated parameters could be evaluated. The activated volumeV was of the order of 1 nm3 and greatly depended on the casting conditions and testing temperature. The value ofV tended to decrease as the liquid crystalline order increased. The value ofV was smaller than the size of liquid crystalline domain.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01124845
