Cellulosic solid films exhibiting cholesteric liquid crystalline order: Part I tensile creep in vacuo for ethyl cellulose and hydroxypropyl cellulose

Ethyl cellulose (EC) and hydroxypropyl cellulose (HPC) films were cast under different conditions and were observed optically. The creep behaviour of those films was determined in vacuo as a function of applied stress or temperature and was analysed on the basis of the Eyring thermally activated process