The Role of Polyvinylpyrrolidone as a Pore Former on Microstructure and Performance of Polysulfone Membranes

Year 2019, , 168 - 176, 30.09.2019

Bilge Eren , Murat Güney

https://doi.org/10.35193/bseufbd.589808

Cited By: 1

Abstract

In this study, the effect of
polyvinylpyrrolidone (PVP) as a pore former on the performance of polysulfone
(PSF) membrane was studied. XRD spectra revealed that a
crystalline-to-amorphous phase transition occurred with the increasing PVP
amount. SEM results indicated the shape and size of macrovoids in the membranes
were altered with the increasing PVP amount in the polymer solution. The Tg
values for the pure PSF and of 5 wt% PVP added PSF membrane were measured as
189 and 182 °C, respectively. The performances of the membranes were determined
by using the pure water flux (PWF) measurements. The PWF of the membranes
increased from 36.76 to 86.80 L m^-2 h^-1 with the increase
of PVP amount (0 to 10 wt %) in PSF polymer solution. The relationship between
PWF and PVP content was explained with the increased thermodynamic instability
and kinetic hindrance.

Keywords

Membrane, Pore Former, Polysulfone, Polyvinylpyrrolidone, SEM

Polisülfon Membranlarının Mikroyapı ve Performansı Üzerine Bir Gözenek Oluşturucu Olarak Polivinilpirolidonun Rolü

Abstract

Bu çalışmada, gözenek oluşturucu olarak
polivinilpirrolidonun (PVP), polisülfon (PSF) membran performansı üzerindeki
etkisi incelenmiştir. XRD spektrumları, artan PVP miktarı ile kristalin fazdan amorf
faza geçişinin gerçekleştiğini ortaya koydu. SEM sonuçları, membranlardaki makro
boşlukların şekli ve boyutunun, polimer çözeltisindeki artan PVP miktarı ile
değiştiğini gösterdi. Saf PSF ve ağırlıkça % 5 PVP ilave edilmiş PSF membranı
için Tg değerleri sırasıyla 189 °C ve 182 °C olarak ölçülmüştür. Membranların
performansı, Saf Su Akışı (SSA) ölçümleri kullanılarak belirlendi. Membranların
SSA'sı PSF polimer çözeltisinde PVP miktarının (ağırlıkça %0’dan %10’a)
artmasıyla 36.76 L m^-2 s^-1 'dan 86.80 L m^-2 s^-1
'e yükselmiştir. SSA ve PVP içeriği arasındaki ilişki artan termodinamik kararsızlık
ve kinetik engel ile açıklanmıştır.

Keywords

Membran, Gözenek Oluşturucu, Polisülfon, Polivinilpirolidon, SEM, SEM

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