Influence of solvent composition and non-solvent activity on the crystalline morphology of PVDF membranes prepared by VIPS process and on their arising mechanical properties

•PVDF membrane formation by VIPS using NMP and acetone as solvent and co-solvent, respectively.•Control of crystalline domain sizes by tuning solvent composition and nonsolvent activity.•Insights on the competition between crystallization and liquid–liquid demixing.•Correlation between mechanical properties and crystalline morphologies.