Photosensitive cholesteric copolymers with spiropyran-containing side groups - II. Kinetic features of the photo- and thermo-chromic processes

Kinetic features of the photo- and thermo-chromic behaviour of new choleste ric triple copolymers with photosensitive spiropyran-containing side groups are considered. The kinetics of the back thermal process at different temp eratures have been studied; activation energies for this process for the co polymers with different contents of the dye units have been obtained. The p hotochromic homopolymer and copolymers with a low content of dye units are shown to possess maximum values of the activation energy.