Low-Temperature Relaxation of Polymers Probed by Photochemical Hole Burning

摘要

Photochemical hole burning spectroscopy is applied to estimate the low-temperature relaxation properties of polymers. Methacrylate polymers, polyethylene derivatives, and polymers with aromatic groups were studied. Both slight and large changes of microenvironments around doped dye molecules are detected by temeprature cycling experiment. Relaxation behavior of the polymers is discussed in relation to their chemical structures. The low-energy excitation mode of each polymer is also estimated and discussed.