Polymer Characterization
Size exclusion chromatographic (SEC) analysis was carried
out by using a Tosoh GPC-8020 apparatus equipped with
refractive index (RI) detector under the following conditions:
TSKgel a-3000 and a-M columns and DMF containing 0.10 M
LiCl eluent at a flow rate of 0.50 units mL1 at 60 8C. The
calibration curves were obtained using polystyrene as standard.
FT-IR was recorded on a Perkin-Elmer Spectrum
One spectrometer equipped with universal ATR sampling
accessory. UV spectra were recorded on a Hitachi U-2001
spectrometer. NMR and ESR spectra were recorded on Bruker
DPX400 and JEOL JES-TE100 spectrometers, respectively.