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首页> 外文期刊>Journal of Applied Polymer Science >Modification via Preparation for Poly(3-hydroxybutyrate) Films: Water-Transport Phenomena and Sorption
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Modification via Preparation for Poly(3-hydroxybutyrate) Films: Water-Transport Phenomena and Sorption

机译：通过制备聚（3-羟基丁酸酯）薄膜的改性：水传输现象和吸附

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摘要

The effect of the preparation technique on the sorption-diffusion parame ters of poly(3-hydroxybutyrate) (PHB) films was studied. The films formed by a singlestage technique have an axial texture of the crystalline phase, with the polymer chain oriented predominantly perpendicularly to hte film plane. Moreover, the crystallites in PHB are preferably ordered in stacks in the ocurse of diffusion; the alignment of the crystallites noticeably decreases the“sites”of PHB (polar groups) which are accessible to water molecules. As a result, the sortion capacity decreases but the rate fo diffusion increases. On the contrary, PHB fims prepared by a two-stage technique are characterized byj a poor ordering of crystallites without texture organization. Here, the sorption/immobilization on the polar groups of PHB is increased, but diffusivities are decreased. Concentration dependencies of the water-diffusion coefficient are discussed. Additional information on the existence of protein impurities in the PHB samples obtained by the above two preparation techniques was obtained by FTIR spectroscopy and H-D exchange methods.
机译：研究了制备工艺对聚（3-羟基丁酸）（PHB）膜吸附-扩散参数的影响。通过单级技术形成的膜具有结晶相的轴向织构，其中聚合物链主要垂直于膜平面取向。此外，PHB中的微晶优选在扩散的过程中以堆叠的形式排列。微晶的排列显着降低了水分子可接近的PHB（极性基团）的“位点”。结果，分拣能力降低，但是扩散速率增加。相反，通过两阶段技术制备的PHB膜的特征在于微晶的无序排列而没有组织结构。在此，在PHB的极性基团上的吸附/固定增加，但是扩散性降低。讨论了水扩散系数的浓度依赖性。通过FTIR光谱法和H-D交换法获得了通过以上两种制备技术获得的PHB样品中蛋白质杂质的存在的其他信息。

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