Preparation and Characterization of PVDF Microporous Membrane via Thermally Induced Phase Separation Method
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Abstract:
Polyvinylidene fluoride (PVDF) microporous membrane was prepared using PVDF as raw material and dimethyl phthalate as diluents through thermally induced phase separation (TIPS) method. The properties and thermodynamic features of PVDF microporous membrane were characterized by scanning electron microscope (SEM), differential scanning calorimetry (DSC) and tensile strength test. The results indicated that DMP had an excellent compatibility with PVDF. When the DMP contents increased from 50% to 80%, the pure water flux and the porosity of PVDF microporous membrane improved from 65 L/(m2?h) and 34% to 230 L/(m2?h) and 77%. While the breaking tensile strength and breaking elongation of the microporous membrane decreased gradually along with the increase of DMP content. Moreover, the pure water flux of PVDF membrane improved by 3~4 times in dealing with organic solvents. Meanwhile, thermodynamic study showed that with the DMP contents increased, PVDF crystal grain became more and more fuzzy and the cavity between spherocrystal became bigger, and the spherocrystal size presented a descendant tendency.
