Dual layer hollow fiber sorbents: Concept, fabrication and characterization

► PVDC selected as the low permeability sheath for dual-layer fiber sorbents. ► Critical polymer concentration (c.p.c.) of PVDC dope found to be 45 wt.% in NMP. ► Macrovoid and delamination free dual-layer fiber sorbents successfully fabricated. ► Effect of dope compositions and spinning process parameters examined in detail by SEM, EDX and permeation analysis. ► Negligible infiltration of PVDC material observed in the CA/NaY core layer.