Polyaniline doped ultrafiltration membranes: Mechanism of membrane formation and pH response characteristics. (26th September 2018)

• Record Type: Journal Article
• Authors: Kurada, Krishnasri V.; De, Sirshendu
• Is Part Of: Polymer. Volume 153(2018)
• Page Start: 201
• Page End: 213
• Publication Date: 2018-09-26
• Subjects: Polyaniline -- Thermodynamic modeling -- Kinetic enhancement -- pH response; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2018.08.032
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Interplay of thermodynamic instability and kinetic effects during formation of polymeric membrane using polyaniline (PANI) as additive are studied along with the pH responsive characterization of the membranes. PANI membranes exhibit pH responsive permeability hysteresis having >30% variation between the two end points. Effect of pH on mechanical strength, contact angle, surface pore size and roughness, etc was studied in detail. It was observed that PANI molecules shrunk in acidic pH whereas, in alkaline pH, swelling occurred leading to increase in size of PANI molecule from 40 μm at pH 2–88 μm at pH 12. Mechanism of membrane pore constriction was proposed based on swelling of PANI in response to pH change and hydrogen bonding. Change in porosity with pH gets reflected by highest rejection of dextran at pH 12 (71%) followed by pH 7 (57%) and pH 2 (50%). Graphical abstract: Image 1 Highlights: Phase inversion of polyaniline doped membrane was studied. Membrane morphology was predicted based on thermodynamic and kinetic parameters. PANI doped membranes were characterized for pH responsive behavior. Mechanism was proposed to explain pH responsive behavior using properties of PANI.