Evidence for size-sieving driven vapor sorption and diffusion in a glassy polybenzoxazole exhibiting configurational free volume
This paper reports, for the first time, the effect of configurational free volume (ie, triptycene
units) on condensable vapor transport in polymers. Alcohol and water vapor solubility and
diffusivity isotherms at 25° C in a triptycene-containing polybenzoxazole (TPBO) exhibiting
configurational free volume are presented as a function of vapor activity, discussed, and
used to develop fundamental structure–property correlations. This study provides evidence
that while in conventional glassy polymers alcohol diffusion is size-controlled and sorption is …
units) on condensable vapor transport in polymers. Alcohol and water vapor solubility and
diffusivity isotherms at 25° C in a triptycene-containing polybenzoxazole (TPBO) exhibiting
configurational free volume are presented as a function of vapor activity, discussed, and
used to develop fundamental structure–property correlations. This study provides evidence
that while in conventional glassy polymers alcohol diffusion is size-controlled and sorption is …
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