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

Öz

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.

Anahtar Kelimeler

• Membrane,Pore Former,Polysulfone,Polyvinylpyrrolidone,SEM

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

Öz

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.

Anahtar Kelimeler

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

Kaynakça

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