Abstract
The steady state fluorescence anisotropy of the chromophore dialkylbenzene, which constitutes the crosslinks of polyethylacrylate and polymethylmethacrylate networks, has been investigated over a range of temperatures, from 20 to 80°C. In polymethylmethacrylate networks the limit anisotropy of dialkylbenzene (r o =0.198) and vinylphenyl side groups of the elastic chains (r o =0.304) have been determined by applying a correction method (previously reported) to discount artifacts typical of front face excitation. In polyethylacrylate networks it was found that the mobility of knots does not change appreciably with temperature even 100°C above the glass transition of the system (about 10°C). It was concluded that polymer dynamics that affect the mobility of knots is different of that determining the motions of the elastic chains.
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