Dependence of spectral and luminescent properties of polymethylmethacrylate on its molecular weight

The influence of molecular weight on the optical characteristics (luminescence and luminescence attenuation kinetics) of polymethylmethacrylate obtained by radiation-chemical methods is studied. The luminescence spectra and luminescence kinetics of polymethylmethacrylate do not depend on the method of polymerization, but are determined only by its molecular weight. It was found that the main contribution to radiation is provided by a luminescence band with a maximum at a wavelength of∼0.5 microns and that with the growth of molecular weight, an increase in the luminescence band width is observed, and the luminescence attenuation time decreases according to the logarithmic law. The relationship between the molecular weight of polymethylmethacrylate, the luminescence band width of polymethylmethacrylate and the luminescence attenuation time of polymethylmethacrylate was established for the first time.