“…From these experiments it was found that the increment in reptation frequency of PMMA chains is chloroform-contentdependent and is at the level of 10 4 s −1 [13,14]. The results obtained from the fast transient fluorescence technique (FTRF) are in agreement with those from the photon transmission technique [15]. In another work using a nonradiative energy-transfer method, effects of different solvents on the film formation were studied and the reptation frequencies of PMMA chains were correlated with the solubility parameters of the solvents [16].…”