Effect of Rheological Behaviour of Cellulose Acetate Spinning Solutions on Performance of Reverse Osmosis Hollow Fiber Membranes

Abstract

Kajian ini bertujuan untuk menyelidik kesan reologi semperitan terhadap membran gentian geronggang osmosis balikan. Ini dilakukan dengan penilaian reologi larutan semperitan selulosa asetat menggunakan sebuah reometer putaran dan sel optik ricih. Sifat hukum kuasa, daya normal dan profil aliran yang terjana memberi penjelasan mengenai fasa balikan dan orientasi molekul. Keputusan reologi ini kemudiannya dihubungkaitkan dengan prestasi membran gentian geronggang osmosis balikan dari segi kadar buangan dan kadar fluks. Keputusan kajian menunjukkan bahawa kadar buangan dan kadar fluks meningkat apabila kadar semperitan larutan meningkat dan ini mungkin disebabkan oleh orientasi molekul. Kata kunci: reologi semperitan; osmosis balikan; gentian geronggang; orientasi molekul Rheological assessment of cellulose acetate spinning solution using a rotational rheometer and an optical shear cell in carried out so as to study the cause and effect relationship between membrane preparation, polymer morphology and membrane performance. The power law behaviour, normal force and flow profiles generated provided clues regarding phase inversion and molecular orientation. These rheological results are then related to the separation performance of cellulose acetate reverse osmosis (RO) hollow fibers membranes; both the rejection rate and the flux rate increased with increasing dope extrusion arate, possibly due to the molecular orientation. Key words: spinning rheology; reverse osmosis; hollow fiber; molecular orientation