Abstract
Hydrodynamic properties of polyacrylonitrile (PAN) in N,N-dimethylformamide (DMF) medium were studied in the presence and absence of amphoteric surfactant “2-[(3-Dodecanamidopropyl)dimethylaminio] acetate” known as betaine, through changes in a viscosity and specific electrical conductivity. The critical micelle concentration of betaine is determined by specific electrical conductivity. Thermodynamic functions of micelle formation of betaine are studied. Reduced viscosity of PAN copolymer in DMF is studied at different temperatures; it is found that temperature change does not affect the mechanism of a crystalline structure formation of PAN solutions. The reduced viscosity of PAN solution in the presence of betaine decreases 40 % on average at high concentrations. Hydrodynamic volume of PAN macromolecules decreases in the presence of betaine. The hydrogen bonding formation between the carbonyl groups of acrylamide in PAN copolymer and the amide groups in betaine is identified by FT/IR spectra. Crystalline structure of PAN in the presence of betaine and its absence is studied by X-ray diffraction and scanning electron microscopy.
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Abdul Nour, S. The Effect of Surfactant “2-[(3-Dodecanamidopropyl)dimethylaminio] Acetate” on Structural Properties of Polyacrylonitrile Copolymer. Arab J Sci Eng 40, 2937–2943 (2015). https://doi.org/10.1007/s13369-015-1595-z
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DOI: https://doi.org/10.1007/s13369-015-1595-z