针对CO2分离膜涂覆过程中界面相容性差、易分层和表面缺陷等问题，采用CO2等离子体改性聚二甲基硅氧烷/聚砜（PDMS/PSf）膜表面，之后浸涂聚醚嵌段聚酰胺（Pebax-1657）溶液制备薄层复合（TFC）膜。优化了CO2等离子体处理功率、处理时间、Pebax溶液浓度及浸涂时间等条件，通过扫描电子显微镜（SEM）、接触角、原子力纳米红外（AFM-Nano-IR）、X射线光电子能谱（XPS）等表征手段，系统研究了制膜条件对膜结构与分离性能的影响。结果表明，CO2等离子体改性后，PDMS膜表面粗糙度增加，接触角降低（115.3°降至55.6°）。 AFM-Nano-IR和XPS表征证实，PDMS与Pebax分离层间界面处化学键合增强，显著提升了界面相容性。优化条件下制得的TFC膜CO2渗透率为598~624 GPU，CO2/N2理想选择性达44~56。CO2等离子体改性结合浸涂法制备Pebax/PDMS/PSf高性能薄层复合膜的工艺简便且易于放大，在CO2/N2气体分离中展现出良好的应用潜力。

新材料重大专项项目资助（2026ZD0621900）； 企业项目“二氧化碳分离膜研发”（322003）

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