Figure 1.

(a) Transmittance of untreated and PIII-treated PES. PIII treatment time was 40, 80, 400 and 800 s. (b) The difference between the absorbance of untreated and PIII-treated PES at 310, 375, 477 and 608 nm as a function of PIII treatment time. Data were fitted to A(t) = a(1 − exp(−t/k)). (c) ESR spectra of untreated and 800 s PIII-treated PES. The peak of 800 s PIII-treated PES was fitted with a sum of two Lorenz functions with positions of peak maximums at g-factors of 2.0032 and 2.0072. The ESR spectrum of 800 s PIII-treated PES was measured a month after the treatment.