Membrane gas absorption (MGA) has been widely used to separate CO₂ from gas mixture attributed to its high interfacial area. In order to secure high absorption flux, the pores of the membrane need to be non-wetted. Currently, hydrophobic membrane suffers from severe pore wetting over prolonged periods of operation. This has called for the enhancement of membrane hydrophobicity to suppress the tendency of pore wetting. In this work, highly hydrophobic PVDF-HFP membrane was synthesized using solvent additive i.e. polydimethylsiloxane-grafted-silica (PGS) via non-solvent induced phase separation. Results showed that mixed matrix membranes (MMMs) exhibited hierarchical structure composed of polymer spherulites due to delayed phase inversion. The embedment of nanoparticles in membrane matrix also contributed to the reduction of membrane’s surface energy. As a result, MMMs achieved an improvement in wetting resistance with a water contact angle up to 149.87° at 3wt% of PGS nanoparticles. The CO₂ absorption test using MEA as liquid absorbent showed that MMMs exhibited an enhancement in gas absorption flux owing to higher hydrophobicity. The CO₂ absorption flux of pristine and MMMs was declined about 37% and 22%, respectively during 150 h of operation.

膜气体吸收（MGA）已被广泛用于分离CO ₂气体混合物归因于其高界面面积。为了确保高吸收通量，需要使膜的孔不润湿。当前，疏水膜在长时间的操作中遭受严重的孔润湿。这就要求增强膜疏水性以抑制孔润湿的趋势。在这项工作中，通过非溶剂诱导的相分离，使用溶剂添加剂即聚二甲基硅氧烷接枝二氧化硅（PGS）合成了高度疏水的PVDF-HFP膜。结果表明，由于延迟的相转化，混合基质膜（MMMs）表现出由聚合物球晶组成的分层结构。纳米颗粒在膜基质中的包埋也有助于减少膜的表面能。结果是，MMM在3wt％的PGS纳米颗粒上的水接触角高达149.87°，从而提高了耐湿性。一氧化碳使用MEA作为液体吸收剂的₂吸收测试表明，由于较高的疏水性，MMM显示出了气体吸收通量的增强。原始150和MMM的CO ₂吸收通量在手术150小时内分别下降了约37％和22％。