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

• Published in: Polymer science. Series A, Chemistry, physics Chemistry, physics, 2024-02, Vol.66 (1), p.136-147
• Main Authors: Liu, Linze, Yang, Yang, Dong, Tungalag, Song, Lijun, Yun, Xueyan
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Polymer Membranes; Polymer Sciences
• ISSN: 0965-545X; 1555-6107
• DOI: 10.1134/S0965545X23600424

To maintain CO 2 /O 2 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 O 2 and CO 2 dioxide permeability of the PLLA microporous film, PTFPMS maintained the CO 2 /O 2 selective permeability of the film. In comparison to PLLA films, the CO 2 permeability of mixed solvents-treated PLTL-20% film increased from 1.99 × 10 –8 to 10.08 × 10 –8 cm 3 m/m 2 h Pa, O 2 permeability increased from 0.70 × 10 –8 to 2.02 × 10 –8 cm 3 m/m 2 h Pa, and CO 2 /O 2 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.