  Electrospinning is a modern alternative to the expanded method for producing
porous polytetrafluoroethylene membranes. High strength and relative
elongation, as well as the ability to maintain these properties for a long time
when exposed to aggressive media at high temperatures, determine the
application scope of the electrospun polytetrafluoroethylene membranes. Herein,
we report the effect of polytetrafluoroethylene suspension content in the
spinning solution, heat treatment mode (quenching and annealing) and aggressive
media at high temperatures on the tensile strength and relative elongation of
electrospun polytetrafluoroethylene membranes. Membranes fabricated from
spinning solutions with 50 to 60 wt % polytetrafluoroethylene suspension
content that underwent quenching were characterized by the highest tensile
strength and relative elongation. Electrospun polytetrafluoroethylene membranes
also demonstrated high chemical resistance to concentrated mineral acids and
alkalis, a bipolar aprotic solvent, engine oil and deionized water at 100 deg
for 48 hours.
