| 概 要 |
The diffusion kinetics of water and acetone into dried PVOH polymer films have been measured simultaneously using the FTIR-ATR technique.
The data have been fitted to a pseudo-Fickian model, along with allowance for an ‘induction’ time which lengthens considerably when the water mole fraction is low.
It has been found that a Case II model is viable at short times when the polymer is ‘glassy’ (<Tg).
However, as water enters the polymer (unzipping the chain-chain hydrogen bonding), conversion to a ‘gel’ is rapid and the crystallinity drops concurrently.
A Fickian-like model then becomes viable at intermediate times.
FTIR-ATR is an excellent technique with which to study sorption from solvent mixtures.
In this case, for example, we have demonstrated that acetone does not enter a dry polymer film and that the micro-crystallinity of the PVOH returns at longer times.
Neither of these two potentially important results could have been obtained using gravimetric methods.
世話人 平田文男（理論分子科学研究系）
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