Positron annihilation lifetime spectroscopy study of polyvinylpyrrolidone‐added polyvinylidene fluoride membranes: Investigation of free volume and permeation relationships

Eren, Bilge; Eren, Erdal; Guney, Murat; Jean, Yan‐Ching; Van Horn, J. David

doi:10.1002/pol.20190031

Title: Positron annihilation lifetime spectroscopy study of polyvinylpyrrolidone‐added polyvinylidene fluoride membranes: Investigation of free volume and permeation relationships

Journal Article · 20 January 2020 · Journal of Polymer Science

DOI: https://doi.org/10.1002/pol.20190031 · OSTI ID:1592521

^[1]; Eren, Erdal ^[1]; Guney, Murat ^[1]; Jean, Yan‐Ching ^[2];

^[2]

Faculty of Science and Arts, Department of Chemistry Bilecik Seyh Edebali University 11210 Bilecik Turkey
Department of Chemistry University of Missouri‐Kansas City Kansas City Missouri 64110

ABSTRACT Polyvinylidene fluoride (PVDF) membranes were prepared via the phase inversion method from casting solutions containing PVDF, dimethylformamide (DMF), and polyvinylpyrrolidone (PVP) as pore former. PVP was used in the casting solution in a range of 0–5 wt % and extracted. The effect on membranes of using PVP in the casting process was analyzed by X‐ray diffraction, differential scanning calorimetry, scanning electron microscopy, viscosity, and water permeability techniques. With an increase of PVP from 0 to 5 wt %, the PVDF casting solution viscosities increased from 858 to 1148 cP; the resulting PVDF membrane thickness increased; and the crystallinity of PVDF membranes decreased from 40.0 to 33.3%, which indicates that the addition of PVP inhibits the degree of crystallization in the PVDF membranes. SEM results revealed the shape and size of macropores in the membranes; these macropores changed after PVP addition to the casting solutions. The impact of structural changes on free‐volume properties was evaluated using positron annihilation lifetime spectroscopy (PALS) studies. PALS analysis indicated no effect on the average radius (~3.4 Å) of membrane free‐volume holes from the addition of PVP to the casting solution. However, the percentage of o ‐Ps pick‐off annihilation intensity, I ₃ , increased from 1.7 to 5.1% with increased PVP content. Further, increasing the PVP content from 0.5 to 5% resulted in an increased final pure water permeability flux. For instance, the 210 min flux for a 14% PVDF + 0.5% PVP membrane was found to be 3.3 times greater than a control membrane having the same PVDF concentration. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58 , 589–598

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Sponsoring Organization:: USDOE

OSTI ID:: 1592521

Journal Information:: Journal of Polymer Science, Journal Name: Journal of Polymer Science Vol. 58 Journal Issue: 4; ISSN 2642-4150

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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