ScCO2-processed thermoplastic starch/chitosan oligosaccharide blown films and their oxygen barrier or antibacterial applications

IF 1.7 4区工程技术 Q4 POLYMER SCIENCE

Journal of Polymer Engineering Pub Date : 2024-08-20 DOI:10.1515/polyeng-2024-0130

Zi-yu Wang, Qian-li Luo, Han-fang Mei, Ning Ma, Ya-qiong Huang, Jen-taut Yeh

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引用次数: 0

Abstract

Antibacterial and oxygen barrier films were inventively prepared by blending very small loadings (<2 wt%) of chitosan oligosaccharide (COS) or chitosan (CS) in thermoplastic starch (TPS) and/or processing with supercritical carbon dioxide (scCO2). Oxygen transmission rates (OTR) and free-volume-hole (FVH) characteristics of scCO2-processed TPS/COS and TPS/CS blown films diminish to a minimum, as their COS or CS approach a specific compatibility limit content. The minimum OTR and FVH characteristics of scCO2-processed TPS/COS films are somewhat smaller than those of corresponding TPS/COS films without scCO2-assistance, and decrease further with decreasing COS molecular weights. The minimum OTR values of scCO2-processed TPS/COS blown films with COS’s molecular weight of 200 and 500 are only 4.1 and 4.5 cm3/m2 × day × atm, respectively, and their antibacterial rates of Staphylococcus aureus are ≥97 %, which make them as promising antibacterial and oxygen barrier films having OTR ≦ 5 cm3/m2 × day × atm. Among other things, longitudinal or transversal tensile strengths acquired for the properly scCO2-processed TPS/COS or TPS/CS films are ∼30 to ∼50 % higher than those of the TPS films. Dynamic mechanical relaxation results of these scCO2-processed reveal that chitosan oligosaccharide or chitosan are compatible with TPS, as COS or CS contents are ≤ the compatibility limit value.

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经 ScCO2 处理的热塑性淀粉/壳聚糖寡糖吹塑薄膜及其氧气阻隔或抗菌应用

通过在热塑性淀粉（TPS）中掺入极少量（<2 wt%）的壳聚糖低聚糖（COS）或壳聚糖（CS）和/或用超临界二氧化碳（scCO2）处理，创造性地制备了抗菌隔氧薄膜。经 scCO2 处理的 TPS/COS 和 TPS/CS 吹膜的氧气透过率（OTR）和自由体积孔（FVH）特性会随着 COS 或 CS 接近特定的相容性极限含量而降低到最低水平。经 scCO2 处理的 TPS/COS 薄膜的最小 OTR 和 FVH 特性略小于无 scCO2 辅助的相应 TPS/COS 薄膜，并且随着 COS 分子量的降低而进一步降低。COS 分子量为 200 和 500 的经 scCO2 处理的 TPS/COS 吹膜的最小 OTR 值分别仅为 4.1 和 4.5 cm3/m2 × 天 × 个大气压，对金黄色葡萄球菌的抗菌率≥97%，使其成为有前途的抗菌隔氧膜，其 OTR ≦ 5 cm3/m2 × 天 × 个大气压。此外，经适当 scCO2 处理的 TPS/COS 或 TPS/CS 薄膜的纵向或横向拉伸强度比 TPS 薄膜高出 30% 至 50%。这些经 scCO2 处理的薄膜的动态机械松弛结果表明，壳聚糖低聚糖或壳聚糖与 TPS 具有相容性，因为 COS 或 CS 的含量低于相容性极限值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.