ION-EXCHANGE MICROPOROUS MEMBRANES BASED ON FLUOROPLASTIC COMPOSITES WITH NATURAL AND MODIFIED CLINOPTILOLITE

Ion-exchange microporous fluoroplastic membranes with enhanced charact eristics, including high permeability, were obtained by introducing na tural and modified clinoptilolites in polytetrafluoroethylene (PTFE). Membranes with diameter 60 mm and thickness 0.3-0.6 mm were formed usi ng natural and modified clinoptilolite forms (ammonium, cuprous-ammoni um and palladious-ammonium) in concentrations of 40 and 60 mass%. The mineral filler builds the porous structure of the fluoroplastic compos ites, and the ammonium and metal-ammonium forms, as well as water phys ically bonded in clinoptilolite, take part as additional pore-formers during decomposition under PTFE sintering conditions. Some of the basi c characteristics, such as pore size distribution, permeability, elect rotransport and mechanical properties, thermal and chemical resistance were determined by differential thermal analysis, thermogravimetric a nalysis, scanning electron microscopy, transmittance electron microsco py, emission spectral analysis, etc.