用 scCO2 加工的热塑性淀粉/糖醇混合物制成的完全可再生氧气阻隔膜

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

Journal of Polymer Engineering Pub Date : 2024-08-02 DOI:10.1515/polyeng-2024-0080

Qian-li Luo, Zi-yu Wang, Ning Ma, Hong-juan Xu, Ya-qiong Huang, Jen-taut Yeh

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引用次数: 0

摘要

通过在热塑性淀粉（TPS）中掺入极少量（<1 wt%）的二羟基丙酮（DHA）、赤藓糖醇（ET）或木糖醇（XT），和/或用超临界二氧化碳（scCO2）辅助处理，制备出了优异的氧气阻隔薄膜。经 scCO2 处理的 TPS/糖醇薄膜系列的最小氧气透过率（OTR）和所有自由体积-孔特性（FVH）值都略小于未经 scCO2 辅助处理的相应 TPS/糖醇薄膜系列，并且随着糖醇分子量的降低而降低。经 scCO2 处理的 TPS/DHA 和 TPS/ET 吹膜的最小 OTR 值分别仅为 3.6 和 4.3 cm3/m2-day-atm，满足 OTR ≦5 cm3/m2-day-atm 的高阻氧薄膜的要求。经 scCO2 处理的 TPS/糖醇系列薄膜的纵向或横向拉伸强度比 TPS 吹塑薄膜高出 30% 至 40%。各 TPS/糖醇或 scCO2 处理的 TPS/糖醇薄膜系列的动态机械松弛显示，糖醇与 TPS 是相容的，因为它们的糖醇含量≤相应的相容性值。TPS/糖醇或经过 scCO2 处理的 TPS/糖醇薄膜的 OTR 值和 FVH 值降低，很可能是由于它们经过 scCO2 处理或加入了分子量较小的糖醇。

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Fully renewable oxygen barrier films of scCO2-processed thermoplastic starch/sugar alcohol blends

Excellent oxygen barrier films were prepared by blending very small loadings (<1 wt%) of dihydroxyacetone (DHA), erythritol (ET) or xylitol (XT) in thermoplastic starch (TPS), and/or processing with supercritical carbon dioxide (scCO2) assistance. The minimum oxygen transmission rates (OTR) and all free-volume-hole characteristic (FVH) values of each scCO2-processed TPS/sugar alcohol film series are somewhat smaller than those of corresponding TPS/sugar alcohol film series without scCO2-assistance, and decrease with the decrease in sugar alcohol’s molecular weight. The minimum OTR values acquired for scCO2-processed TPS/DHA and TPS/ET blown films are only 3.6 and 4.3 cm3/m2·day·atm, respectively, which meet the demand of high oxygen barrier films having OTR ≦5 cm3/m2·day·atm. The longitudinal or transversal tensile strengths acquired for each scCO2-processed TPS/sugar alcohol series films are ∼30 % to ∼40 % higher than those of the TPS blown films. Dynamic mechanical relaxations of each TPS/sugar alcohol or scCO2-processed TPS/sugar alcohol film series reveal that the sugar alcohols are compatible with TPS, as their sugar alcohol contents are ≤ the corresponding compatibility values. The decreased OTR and FVH values acquired for TPS/sugar alcohol or scCO2-processed TPS/sugar alcohol films are most likely due to them being scCO2-processed or incorporated with smaller molecular weight of sugar alcohols.

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来源期刊

Journal of Polymer Engineering 工程技术-高分子科学

CiteScore

3.20

自引率

5.00%

发文量

审稿时长

2.5 months

期刊介绍： Journal of Polymer Engineering publishes reviews, original basic and applied research contributions as well as recent technological developments in polymer engineering. Polymer engineering is a strongly interdisciplinary field and papers published by the journal may span areas such as polymer physics, polymer processing and engineering of polymer-based materials and their applications. The editors and the publisher are committed to high quality standards and rapid handling of the peer review and publication processes.