Structure and Properties of Polyurethane/Polyvinylidene Difluoride Blending Hollow Fiber

IntroductionMembrane with the property of pressure-responsibili-ty ,PR,is one kind of membranes , and the pores of thismembrane can be changed reversibly with pressure in a se-paration system. This thus provides the membrane with agreat deal of advantages . For example ,the first is that thePR membranes can separate different masses by varyingpressures relating to its varying pore sizes ,and the secondis the regeneration of a fouled PR membrane easily becausethe pores could be enlargedin cle…

Structure and Properties of Polyurethane/Polyvinylidene Difluoride Blending Hollow Fiber

Utilization of polyvinylidene difluoride, PVDF, as the disperse phase and thermal plastic polyurethane, PU, as the continuous phase, the PU/PVDF blend hollow fiber membranes with the property of pressure-responsibility, PR, was prepared by melt.spinning. For these hollow fibers, the formation of the interracial micro-voids, IFM, and the spinablllty of the blend were analyzed. The pressm-e-responslblllty was studied by measuring the changing of pure water flux, PWF, with the pressure, and the influence of drawing and heat-setting on the structure and pressure-responsibility of the membranes were also discussed.