Effect of solvent and coagulation bath temperature on the structure and morphology of poly (vinylidene fluoride) (PVDF) membranes

Asymmetric poly (vinylidene fluoride) (PVDF) membranes were prepared from with commercial-grade Kynar K760polymer pellets and two different solvent systems: N,N-dimethylacetamide (DMAc) and 1-methyl-2-pyrrolidone (NMP). The effects of the mentioned solvent and coagulation bath temperature onthe membrane morphology were studied. The membrane morphology was examined with scanning electron microscopy. The results showed that increasing the coagulation bath temperature from5 to55°C converts the membrane morphology to the spongelike structure. In fact, for both solvents used in this work with increasing coagulation bath temperature, the morphology of both structures from finger like goes to the sponge like structure

Keywords:

poly vinylidene fluoride (PVDF) , temperature , morphology