129Xe NMR spectra of 129Xe in polyphenyleneoxide, PPO were measured at various temperatures below Tg. From the analysis of 129Xe NMR chemical shifts, the mean volume of individual microvoids in PPO, v could be determined. The temperature when value of v becomes same as a Xe atom, was very close to Tg of PPO. Temperature dependence of individual microvoid’s volume was very similar with that of CH′, which is obtained by dual-mode sorption model from Xe sorption isotherms and is corresponding to the unrelaxed volume of PPO in the glassy state.
- Hiroaki Yoshimizu
- Satoshi Ohta
- Yoshiharu Tsujita
