An atmosphere within a package affects the metabolic process of food and the microbial growth of fresh products and has a vital role in preserving food. It depends on the membrane's specific gas permeability and selectivity to generate a desirable atmosphere for storage. In this study, triblock poly(l-lactic acid‑d-ɛ-caprolactone) (PLDC) copolymers and three-arm poly(l-lactic acid-g-ɛ-caprolactone) (PLGC) star copolymers were synthesized, in which a microphase-separated morphology of sea-island structure was established in PLGC membrane as a gas “fast permeation channel” for regulating CO₂ and O₂ permeability and CO₂/O₂ selectivity. AFM observation revealed different well-defined micro phase-separated structures of PLGC with size ranges of 200– 300 nm. Comparing PLGC membrane with PLLA, CO₂ and O₂ transmission rates increased by 416.9 % and 132.7 %, while H₂O transport rates increased by 245.6 %. Mechanical testing shows that the PLGC membrane exhibits 40.8-fold elongation at break compared to PLLA, showing excellent flexibility. Moreover, okra's equilibrium-modified atmosphere packaging was designed based on a theoretically derived model. Preservation results suggested that the PLGC packaging membrane could generate an ideal high 8.7– 9.2 % CO₂ and low 2.3– 2.7 % O₂ atmosphere for okra preservation, delaying the discoloring and rotting of okra.

包装内的气氛影响食物的代谢过程和新鲜产品的微生物生长，对保存食物起着至关重要的作用。它取决于膜的特定透气性和选择性，以产生理想的储存气氛。在这项研究中，合成了三嵌段聚（l-乳酸-d -ε-己内酯）（PLDC）共聚物和三臂聚（L-乳酸-g -ε-己内酯）（PLGC）星型共聚物，其中在PLGC膜中建立微相分离的海岛结构形态，作为调节CO ₂和O ₂渗透率和CO ₂ /O _{2的气体“快速渗透通道”}选择性。AFM 观察揭示了不同的明确定义的 PLGC 微相分离结构，尺寸范围为 200-300 nm。PLGC膜与PLLA相比，CO ₂和O ₂的传输率分别提高了416.9 %和132.7 %，而H ₂ O的传输率提高了245.6 %。机械测试表明，PLGC 膜的断裂伸长率是 PLLA 的 40.8 倍，表现出优异的柔韧性。此外，秋葵的平衡气调包装是基于理论推导的模型设计的。保存结果表明，PLGC 包装膜可以产生理想的高 8.7-9.2 % CO ₂和低 2.3- 2.7 % O ₂保护秋葵的气氛，延缓秋葵的变色和腐烂。