高分子の化学構造と気体輸送の関係

概要

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Our study on gas transport properties of polyphosphazenes and poly (vinyl exters) was reviewed. The purpose of this study is to accumulate our knowledge on the relationships between structure and gas transport of both rubbery and glassy polymers. Gas permeability of polyphosphazenes largely depends on the structures of side chain. When the side chain is small and nonpolar, the permeability reaches to the order of 10-8 cm3 (STP) ·cm/ (cm2 · sec ·cmHg). The permeability decreased about two orders for some gases as the increase of size and/or polarity of the side chain and it was mainly due to the decrease of diffusivity. For poly [bis (trifluoroethoxy) phosphazene]. it was shown that gas dissolves and diffuses into the mesophase above T (1). In addition, specific interactions between fluorine containing group and polar gases was shown. Form the study of poly (vinyl esters), gas permeability in glassy state was increased by introduction of rigid and bulky groups. This result is in contrast to that of rubbery polymers, polyphosphazenes. Gas diffusivity at Tg was tried to quantitatively correlate with free volume for all poly (vinyl esters) studied. From CO2 sorption study, plasticization effect of sorbed gas was revealed. Modifications of dual-mode sorption model and a new model considering this effect were briefly reviewed together with a totally different transport model, “pore” model.
日本膜学会の論文