Polyelectrolyte complex membranes based on two anionic polysaccharides composed of sodium alginate and carrageenan: The effect of annealing on the separation of methanol/water mixtures

• Published in: Journal of applied polymer science Vol. 102; no. 6; pp. 5781 - 5788
• Main Authors: Kim, Sang-Gyun, Lee, Ki-Sub, Lee, Kew-Ho
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 15.12.2006; Wiley
• Subjects: Applied sciences; Exact sciences and technology; Exchange resins and membranes; Forms of application and semi-finished materials; membranes; metal-polymer complexes; polyelectrolytes; Polymer industry, paints, wood; polysaccharides; Technology of polymers; Water; polysaccharides; Annealing; metal-polymer complexes; Transport properties; Calcium Compounds; Uronide polymer; Alginates; Crystallinity; Experimental study; Property processing relationship; polyelectrolytes; Polyelectrolyte; Structure processing relationship; membranes; Selective permeability; Membrane; Oside polymer; Interpolymer; Carrageenan; Methanol; Pervaporation
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.23903

Through the complexation of two anionic polysaccharide blends composed of sodium alginate and carrageenan with divalent calcium ions, polyelectrolyte complex membranes were prepared. The effects of annealing on the structure of the polyelectrolyte complex membranes and on their performance at removing water from a methanol mixture were investigated and discussed. The annealed membranes exhibited a change in their crystallinity. The change was due to a rearrangement of polymer chains, which was induced by a deformation of the chelate structure and intramolecular or intermolecular interactions between the polysaccharides. Because of the effects of annealing on the resulting membranes, water components almost penetrated the membranes to the permeate side in the vapor permeation process. Moreover, the membrane performances were gradually enhanced as the operating temperature increased. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 5781–5788, 2006