Online SAXS investigations of polymeric hollow fibre membranes

Pranzas, P. Klaus; Knöchel, Arndt; Kneifel, Klemens; Kamusewitz, Helmut; Weigel, Thomas; Gehrke, Rainer; Funari, Sérgio S.; Willumeit, Regine
July 2003
Analytical & Bioanalytical Chemistry;Jul2003, Vol. 376 Issue 5, p602
Academic Journal
Polymeric membranes are used in industrial and analytical separation techniques. In this study small-angle X-ray scattering (SAXS) with synchrotron radiation has been applied for in-situ characterisation during formation of polymeric membranes. The spinning of a polyetherimide (PEI) hollow fibre membrane was chosen for investigation of dynamic aggregation processes during membrane formation, because it allows the measurement of the dynamic equilibrium at different distances from the spinning nozzle. With this system it is possible to resolve structural changes in the nm-size range which occur during membrane formation on the time-scale of milliseconds. Integral structural parameters, like radius of gyration and pair-distance distribution, were determined. Depending on the chosen spinning parameters, e.g. the flow ratio between polymer solution and coagulant water, significant changes in the scattering curves have been observed. The data are correlated with the distance from the spinning nozzle in order to get information about the kinetics of membrane formation which has fundamental influence on structure and properties of the membrane.


Related Articles

  • Exploring the melting of a semirigid-chain polymer with temperature-resolved small-angle X-ray scattering. Ivanov, D. A.; Hocquet, S.; Dosière, M.; Koch, M. H. J. // European Physical Journal E -- Soft Matter;Apr2004, Vol. 13 Issue 4, p363 

    The thermal behavior of semirigid semicrystalline polymers differs significantly from that of flexible-chain polymers. The origin of the differences is believed to lie in the higher energy expenditure associated with the formation of adjacent re-entry folds at the crystalline surface in the case...

  • Ions in hyaluronic acid solutions. Horkay, Ferenc; Basser, Peter J.; Londono, David J.; Hecht, Anne-Marie; Geissler, Erik // Journal of Chemical Physics;11/14/2009, Vol. 131 Issue 18, p184902 

    Hyaluronic acid (HA) is an anionic biopolymer that is almost ubiquitous in biological tissues. An attempt is made to determine the dominant features that account for both its abundance and its multifunctional role, and which set it apart from other types of biopolymers. A combination of osmotic...

  • Nonisothermal Flow of Polymer Solutions and Melts in Channels of Constant Cross Section. Yankov, V. I.; Trufanova, N. M.; Shcherbinin, A. G. // Theoretical Foundations of Chemical Engineering;Mar/Apr2004, Vol. 38 Issue 2, p179 

    Under the assumption that the temperature of a polymer solution or melt is constant over a channel cross section, the nonisothermal flow in various channels of constant longitudinal geometry was investigated in the cases where the polymeric liquid viscosity varies with temperature exponentially...

  • Order and strain in main-chain smectic liquid-crystalline polymers and elastomers. De Jeu, W. H.; Obraztsov, E. P.; Ostrovskii, B. I.; Ren, W.; McMullan, P. J.; Griffin, A. C.; S�nchez-Ferrer, A.; Finkelmann, H. // European Physical Journal E -- Soft Matter;Dec2007, Vol. 24 Issue 4, p399 

    The layer correlations in main-chain smectic liquid-crystal polymer and elastomer systems have been studied using high-resolution X-ray scattering. In contrast to side-chain smectic polymers, in main-chain systems the polymer chains are oriented parallel to the layer normal. As a result they...

  • Effects of grafted polymer chains on lamellar membranes. Masui, Tomomi; Imai, Masayuki; Nakaya, Kaori; Taniguchi, Takashi // Journal of Chemical Physics;2/21/2006, Vol. 124 Issue 7, p074904 

    We have investigated the effects of grafted polymer chains [poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)] on the bending modulus and the intermembrane interactions of lamellar membranes (C12E5 water) by means of a neutron spin-echo and a small-angle x-ray scattering technique....

  • Elasticity and Inelasticity of Hard-Phase Reinforced Polyurethane Elastomers: From Sensitivity to Chemical and Physical Structure to Time Dependent Phenomena. Prisacariu, C.; Scortanu, E.; Buckley, C. P. // AIP Conference Proceedings;6/2/2010, Vol. 1255 Issue 1, p4 

    A study was made of how aspects of the constitutive responses of polyurethane elastomers vary with composition: the hard segment, soft segment and chain extender were varied systematically in a family of 18 segmented copolyurethane elastomers. Results were related to microstructural changes, on...

  • UkÅ‚ady nanohybrydowe poliuretan (PUR)/funkcjonalizowany silseskwioksan (PHIPOSS). Cz. II. Rentgenowskie badania strukturalne metodami WAXD i SAXS. Janowski, Bartłomiej; Pielichowski, Krzysztof; Kwiatkowski, Ryszard // Polimery;2014, Vol. 59 Issue 2, p147 

    The structure of the nanohybrid PUR/POSS systems containing 2, 4, 6, 8 and 10 wt. % PHIPOSS has been characterized by WAXD and SAXS methods. WAXD diffraction patterns of the hybrid elastomers were analyzed by deconvolution into diffuse scattering maxima of the hard phase or soft phase and the...

  • Collective dynamics of polymer solutions. Fredrickson, Glenn H.; Helfand, Eugene // Journal of Chemical Physics;8/1/1990, Vol. 93 Issue 3, p2048 

    We present a field-theoretic treatment of polymer solution dynamics. The method involves the construction of a Martin–Siggia–Rose generating functional for flexible polymer chains dissolved in a low molecular weight solvent. This formalism is shown to be particularly convenient for...

  • Monofilament drawing device for in situ x-ray scattering studies of orientation development... Nolan, S.J.; Broomall, C.F.; Bubeck, R.A.; Radler, M.J. // Review of Scientific Instruments;Mar95, Vol. 66 Issue 3, p2652 

    Describes a monofilament drawing device for in situ x-ray scattering studies of orientation development on polymeric devices. Direct relation of the physical properties of polymer fibers to the development of orientation in the draw zone under extensional conditions; Conditions which may make...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics