Knowledge of Barrier Films：the Introduction and Application of Asymmetric Films

Asymmetric membranes are functional barrier membranes with non-uniformly distributed membrane structure and properties. Their core characteristic is that different regions of the membrane (surface and bottom layers, or different sides) exhibit significant differences in material, pore size, density, or functional groups, thus achieving a balance between "high barrier properties" and "other functionalities (such as flexibility and heat-sealing properties)." Unlike traditional symmetrical membranes (where each layer has a consistent structure and properties), they are key materials in high-end packaging, industrial protection, and other fields.

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