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In this research, short fiber/polymer composite membranes is introduced for gas separation. Our attempt is to increase the membranes performance by using wide interface between fiber and polymer. Short glass wool fiber (SGWF) was used as a polar micro size reinforcement and was mechanically dispersed in polyurethane matrix. Scanning electron microscope (SEM) images showed that fibers have a good dispersion and adhesion to polymer matrix. In order to survey the phase separation and crystallization behavior of polyurethane segments, differential scanning calorimetery (DSC) and dynamic mechanical thermal analysis (DMTA) were used. The results indicated that polar surface of glass wool is a suitable site for attraction of hard segments. Thermal transition of soft segments were assisted using DMTA. Obtained results were showed that the presence of glass wool fiber remarkably reduced the soft segments glass transition temperature (T g ). Gas permeation properties of membranes were assisted using pure CO 2 , CH 4 and N 2 gases. Presence of SGWF caused a simultaneous increase in permeability and ideal selectivity (permselectivity) in a way that composite membranes showed high performance. Thus, using of fiber instead of nanoparticles in polymeric membranes can be more beneficial in view of economic and performance for industrial applications. [ABSTRACT FROM AUTHOR]

Highlights: [•] MMMs based on polyetherurethane and polyesterurethane, comprising silica prepared. [•] The gas transport properties of CH4 and CO2 in the membranes were investigated. [•] The selectivity of CO2 over CH4 through membranes increased with silica content. [•] ESPU/silica membranes showed higher gas permeability compared to ETPU/silica ones. [•] ESPU/silica had a greater CO2/CH4 selectivity than ETPU/silica membranes. [Copyright &y& Elsevier]