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Correlations between the free-volume properties and the miscibility of chitosan/polar polymers blend membranes

机译：壳聚糖/极性聚合物共混膜的自由体积性质与混溶性之间的相关性

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摘要

The miscibility of chitosan(CS)/polar polymer blend membranes has been studied by positron annihilation and other methods.The miscibility of these two blend systems(CS/polyvinyl pyrrolidone(PVP)and CS/polyethylene glycol(PEG))is good in the solution state due to the hydrogen interaction between the functional groups of the studied polymers.However,the miscibility of these two blend systems in the solid state is better in the CS/PVP system than in the CS/PEG system.The differences in miscibility of such two blend systems in the solid state were powerfully demonstrated with positron annihilation lifetime spectroscopy(PALS)methods.The CS/PEG blend system had much larger free-volume size and lower free-volume concentration.For their poorer interaction and phase separation fact,the molecules in the interfacial zone of the CS/PEG blend are less compact than the CS matrix.Therefore,the free-volume size in the interfacial zone was much larger than it in the CS matrix.
机译：已通过正电子an灭和其他方法研究了壳聚糖（CS）/极性聚合物共混膜的可混溶性。由于所研究的聚合物的官能团之间存在氢相互作用，因此溶液处于固溶状态。然而，这两种共混体系在固态下的混溶性比CS / PVP体系中的混溶性更好。用正电子blend没寿命光谱（PALS）方法对这两种固态共混体系进行了有力的论证.CS / PEG共混体系具有更大的自由体积尺寸和更低的自由体积浓度。 CS / PEG共混物的界面区域中的分子不如CS基质致密。因此，界面区域中的自由体积尺寸比CS基质中的自由体积大得多。

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