Vahid Jabbari - Influence of PVDF concentration on the morphology, surface roughness, crystalline structure, and filtration separation properties of semicrystalline phase inversion polymeric membranes

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      Publication Details (including relevant citation   information):

      Desalination and Water Treatment 46 (1-3), 96-106


      This study was focused on the fabrication of nanoporous   poly(vinylidene fluoride) (PVDF) membranes at different polymer   concentration (14, 17, and 20 wt%) via phase inversion method.   The morphology and surface roughness of the resulting membranes   were investigated by scanning electron microscopy (SEM) and   atomic force microscope, respectively. SEM results showed that   with the increase of polymer concentration, the pore size of   membranes and the overall porosity decrease. Also, the results   showed that varying concentration results in significant changes   on the surface roughness. Analysis of the crystalline structures   of PVDF membranes by X-ray diffraction showed that the membranes,   which precipitated in the higher concentration of polymer   (20 wt%) had a typical “β” form of the crystalline phase, whereas   those membranes that formed at lower concentration (14 wt%)   showed crystallites of the “α + β” form of the crystalline phase.   Furthermore, the filtration separation experiments of Acid Yellow   23 (AY23) were conducted to examine the effects of concentration   parameter on the performance of nanoporous PVDF membranes.   Results showed that the retention of AY23 increases as the   polymer concentration increases and an efficiency of 89.72% was   achieved in polymer concentration of 20 wt%.

      Address (URL): DOI:   10.1080/19443994.2012.677524