Component mobility analysis in the membrane-forming system water/n-methyl-2-pyrrolidone/polyethersulfone
作者： Gabriel Tkacik , Leos Zeman
DOI: 10.1016/S0376-7388(00)82233-4
关键词:
摘要: Abstract Component mobilities (diffusion coefficients) were evaluated in the membrane-forming system water-N-methyl-2-pyrrolidone-polyethersulfone (H2O(1)-NMP(2)-PES(3)). Two types of solvent-nonsolvent binary diffusion coefficients obtained. In 1-2 mixture D12=5-7X10−6 cm2/sec. agreement with observations other authors, macromolecular measured by quasi-elastic light scattering (QELS) found to exhibit anisotropy semidilute and concentrated solutions. 2-3 binary, fast mode were: DC23=3-7X10−7 cm2/sec slow DCM23=3X10−9-8X10−12 Fast QELS modes identified cooperative (C) center-of-mass (CM) motions polymer chains, respectively. Friction factors calculated for both modes. Concentration dependence friction was be strikingly different two ternary mixtures, fast-mode mobility decrease nonsolvent concentration, while (where detectable) unaffected addition nonsolvent. Mobility PES solvent systems also investigated.
elsevier.com
sci-hub.se 参考文章(10)
J M Vaughan, Quasi-Elastic Light Scattering from Polymer Systems Springer Netherlands. pp. 305- 347 ,(1982) , 10.1007/978-94-009-7915-4_13
Leos Zeman, Gabriel Tkacik, Thermodynamic analysis of a membrane-forming system water/N-methyl-2-pyrrolidone/polyethersulfone Journal of Membrane Science. ,vol. 36, pp. 119- 140 ,(1988) , 10.1016/0376-7388(88)80011-5
Dou Huong Hwang, Claude Cohen, Diffusion and relaxation in polymer-solvent systems. 2. Poly(methyl methacrylate)/methyl ethyl ketone Macromolecules. ,vol. 17, pp. 1679- 1685 ,(1984) , 10.1021/MA00142A076
Wyn Brown, Robert M. Johnsen, Diffusion coefficients in semidilute solutions evaluated from dynamic light scattering and concentration gradient measurements as a function of solvent quality. 1. Intermediate molecular weights Macromolecules. ,vol. 18, pp. 379- 387 ,(1985) , 10.1021/MA00145A014
Wyn Brown, Slow-mode diffusion in semidulute solutions examined by dynamic light scattering Macromolecules. ,vol. 17, pp. 66- 72 ,(1984) , 10.1021/MA00131A013
P. Mathiez, C. Mouttet, G. Weisbuch, On the nature of the slow modes appearing in quasi-elastic light scattering by semi-dilute polymer solutions Journal de Physique. ,vol. 41, pp. 519- 523 ,(1980) , 10.1051/JPHYS:01980004106051900
Gennaro Guarino, Ornella Ortona, Roberto Sartorio, Vincenzo Vitagliano, Diffusion, viscosity, and refractivity data on the systems dimethylformamide-water and N-methylpyrrolidone-water at 5.degree.C Journal of Chemical & Engineering Data. ,vol. 30, pp. 366- 368 ,(1985) , 10.1021/JE00041A039
Dennis E. Koppel, Analysis of Macromolecular Polydispersity in Intensity Correlation Spectroscopy: The Method of Cumulants Journal of Chemical Physics. ,vol. 57, pp. 4814- 4820 ,(1972) , 10.1063/1.1678153
F.W. Altena, J. Smid, J.W.A. Van den Berg, J.G. Wijmans, C.A. Smolders, Diffusion of solvent from a cast cellulose acetate solution during the formation of skinned membranes Polymer. ,vol. 26, pp. 1531- 1538 ,(1985) , 10.1016/0032-3861(85)90089-8
Static and Dynamic Properties of the Polymeric Solid State Springer Netherlands. ,(1982) , 10.1007/978-94-009-7915-4