Proceedings of the Polymer Society of Korea Conference (한국고분자학회:학술대회논문집)

The Polymer Society of Korea (한국고분자학회)
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The Relationship between $^{129}Xe$ NMR Chemical Shifts and Nanostructure of Polymers

  • Yoshimizu, Hiroaki (Graduate School of Engineering, Nagoya Institute of Technology) ;
  • Suzuki, Tomoyuki (Graduate School of Engineering, Nagoya Institute of Technology) ;
  • Asano, Tomoko (Graduate School of Engineering, Nagoya Institute of Technology) ;
  • Tsujita, Yoshiharu (Graduate School of Engineering, Nagoya Institute of Technology)
  • Published : 2006.10.13
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Abstract

In this study, the microvoids in glassy polymers were investigated by Xe sorption and $^{129}Xe$ NMR measurements. Xe sorption isotherms of glassy polymers have been successfully interpreted by the dual-mode sorption model. $^{129}Xe$ NMR chemical shift of the $^{129}Xe$ in the samples show nonlinear low-field shift with increasing sorption amount of Xe because of a fast exchange of Xe atoms between Henry and Langmuir sites, whereas it has showed linear shift against sorption amount of Xe into the Langmuir site. From this Xe-density dependence of the $^{129}Xe$ NMR chemical shift, it has been able to estimate mean size of the microvoids in glassy polymer. It is confirmed that there is correlation between ${C_H}'$ and volume or number of microvoids. From these findings, it is demonstrated that $^{129}Xe$ NMR spectroscopy is a powerful technique to determine the mean size and number of microvoids in glassy polymers.

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