Preparation of new membranes by complex formation of itaconic acid–acrylamide copolymer with polyvinylpyrrolidone: studies on gelation mechanism by light scattering

摘要: Abstract Mechanism of membrane formation by dipping a 10 wt% aqueous homogeneous polymer solution poly(itaconic acid– co -acrylamide) (75:25 molar ratio)/polyvinylpyrrolidone (50/50) into acid was investigated time-resolved light scattering and the pH effect to gelation mechanism during discussed. In range 1.58–1.25, governed phase separation via spinodal decomposition then with regular pore size obtained. The caused polymer–polymer complex between polymers. From an analysis based on Cahn's linearized theory decomposition, apparent diffusion coefficient D app smaller for lower pH. Because, at low there exists lot which dramatically reduces chain mobility. average also depends When than 1.25, liquid–liquid did not occur but gelled homogeneously wrinkle-like morphology without observed. FTIR dried membranes showed that had occurred hydrogen bonding component polymers its extent increased linearly decreasing