A new dip-coating approach for plasticization-resistant polyimide hollow fiber membranes: In situ thermal imidization and cross-linking of polyamic acid

•A chemically and thermally resistant porous polymeric hollow fiber support was fabricated.•Polyamic acid precursors were coated on a hollow fiber substrate via dip-coating.•A polyimide selective layer was formed via in situ thermal imidization and cross-linking.•The resulting membrane enhanced gas separation performance due to the formation of imine linkages.•The resulting membrane showed good plasticization resistance due to cross-linking.