In this paper, flat membrane distillation membranes have been successf
ully manufactured from PVDF/DMAc and PVDF/DMF blends by using phase in
version induced by an immersion precipitation technique. The structure
of the membranes is asymmetric with a porous top layer and macrovoids
, as assessed by SEM. The existence of MD fluxes in these membranes is
established by performing various pure water flux experiments. A maxi
mum in the MD fluxes for a particular value of the polymer content in
the casting solution from which the membrane is manufactured has been
observed. The dependence of the magnitude of the fluxes on the membran
e thickness is also discussed and the influence of temperature polariz
ation evaluated.