Preparation and Characterization of PLLA-Based Microporous Membranes with High CO2/O2 Selective Permeability for Food Packaging

IF 1 4区化学 Q4 POLYMER SCIENCE

Polymer Science, Series A Pub Date : 2024-07-10 DOI:10.1134/S0965545X23600424

Linze Liu, Yang Yang, Tungalag Dong, Lijun Song, Xueyan Yun

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Abstract

To maintain CO₂/O₂ permselectivity of poly(lactic acid) (PLLA) microporous films for better preservation of fresh produce, Polytrifluoropropylmethylsiloxane (PTFPMS) was introduced into PLLA to prepare PLLA-PTFPMS-PLLA (PLTL) block copolymer. And PLTL-n% microporous films were prepared using varying ratios of chloroform/acetone blended solvents as the film-casting solution in this study. PTFPMS filled a portion of the micropores of the PLTL-n% film. While the micropores enhanced the O₂ and CO₂ dioxide permeability of the PLLA microporous film, PTFPMS maintained the CO₂/O₂ selective permeability of the film. In comparison to PLLA films, the CO₂ permeability of mixed solvents-treated PLTL-20% film increased from 1.99 × 10^–8 to 10.08 × 10^–8 cm³ m/m² h Pa, O₂ permeability increased from 0.70 × 10^–8 to 2.02 × 10^–8 cm³ m/m² h Pa, and CO₂/O₂ permselectivity increased from 2.9 to 5.0 at 5°C. In addition, PLTL-n% microporous films also have good flexibility and UV shielding properties.

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用于食品包装的具有高二氧化碳/氧气选择透过性的聚乳酸基微孔膜的制备与表征

摘要为了保持聚乳酸（PLLA）微孔薄膜的 CO2/O2 许可选择性以更好地保鲜农产品，在聚乳酸中引入了聚三氟丙基甲基硅氧烷（PTFPMS）以制备 PLLA-PTFPMS-PLLA （PLTL）嵌段共聚物。本研究使用不同比例的氯仿/丙酮混合溶剂作为铸膜溶液，制备了 PLTL-n% 微孔薄膜。PTFPMS 填满了 PLTL-n% 薄膜的部分微孔。微孔增强了 PLLA 微孔薄膜的氧气和二氧化碳渗透性，而 PTFPMS 则保持了薄膜的二氧化碳/氧气选择性渗透性。与 PLLA 薄膜相比，经混合溶剂处理的 PLTL-20% 薄膜的二氧化碳渗透性从 1.99 × 10-8 增加到 10.08 × 10-8 cm3 m/m2 h Pa，氧气渗透性从 0.70 × 10-8 增加到 2.02 × 10-8 cm3 m/m2 h Pa，在 5°C 时二氧化碳/氧气选择性从 2.9 增加到 5.0。此外，PLTL-n% 微孔薄膜还具有良好的柔韧性和紫外线屏蔽性能。

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来源期刊

Polymer Science, Series A 化学-高分子科学

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： Polymer Science, Series A is a journal published in collaboration with the Russian Academy of Sciences. Series A includes experimental and theoretical papers and reviews devoted to physicochemical studies of the structure and properties of polymers (6 issues a year). All journal series present original papers and reviews covering all fundamental aspects of macromolecular science. Contributions should be of marked novelty and interest for a broad readership. Articles may be written in English or Russian regardless of country and nationality of authors. All manuscripts are peer reviewed. Online submission via Internet to the Series A, B, and C is available at http://polymsci.ru.