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  • 1
    Digitale Medien
    Digitale Medien
    Radiation chemistry of octamethyltrisiloxane (1971)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 75 (1971), S. 2430-2435 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100685a003
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  • 2
    Digitale Medien
    Digitale Medien
    The state of water in swollen ionomers containing sulfonic acid salts (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 2625-2637 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The proton magnetic resonance relaxation times and heat capacity of water in perfluoroethylene sulfonic acid (Nafion), chlorosulfonated polyethylene (SPE), and sulfonated polysulfone (SPS) were measured as a function of temperature. Only the relaxation data for water present in Nafion conformed to the BPP model. The data indicate that the presence of fine pores, ∼12 Å in diameter, causes water-surface interactions to play a significant role. For materials with the same pore size, a difference in spin-lattice relaxation time T1 may be correlated to the Flory-Huggins parameter χ calculated for the interaction of water with the neutral portion of the polymer backbone. Only a part of the water present in Nafion and SPE undergoes freezing, while no transition was observed for water in SPS for temperatures down to -60°C. For Nafion and SPE, the heat of fusion ΔHf calculated from combined FID data and the DSC study was ⋍20 cal/g.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1981.070260812
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  • 3
    Digitale Medien
    Digitale Medien
    Ionic heterogeneities in sulfonated polysulfone films (1983)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 28 (1983), S. 3235-3245 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Measurements of glass transition temperature, small-angle x-ray scattering (SAXS), and transmission electron microscopy (TEM) have been applied to the study of ionic heterogeneities in sulfonated polysulfone (SPS) films. The SAXS study confirms the existence of heterogeneities in the electron density distribution, whose appearence for the Cs+1, Ca+2, and Fe+3 forms of SPS but not for H+ suggests that the scattering centers are ion-containing regions. However, a TEM study could not detect the existence of microseparated regions down to a level of 50 Å and the Tg behavior as a function of IEC was more typical of that for random copolymers. A Mössbauer study, performed earlier by Heitner-Wirguin et al. on samples of our material, indicated the existence of clusters ∼35-40 Å in diameter.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1983.070281018
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  • 4
    Digitale Medien
    Digitale Medien
    The surface tension of polymer solutions and asymmetric membrane formation (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 18 (1974), S. 2149-2163 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The surface concentration of polymer molecules in solution has been combined with the three-component bulk-phase diagram of Strathmann et al. to describe the complete equilibrium thermodynamic precasting situation. The polymer surface concentration is estimated according to the theory of Prigogine and Marechal as used by Siow and Patterson, and is governed by the relative values of the polymer and solvent surface tension, γp and γs respectively. In general, when γp 〉 γs, the cast membrane will tend to form with the asymmetric layer on the support side; for γp 〈 γs it will tend to form on the gelation bath side. This was found to be the case for several cellulose acetate casting solutions, including the acetone/formamide mixture of Manjikian. The surface tension of cellulose acetate in the latter mixture appeared to be much lower than in single solvents such as DMSO. The effects of surface tension were used to prepare asymmetric gels of poly(phenylene oxide) and nylon 11 by cooling high-temperature solutions in which γs 〉 γp at the gel transition point.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1974.070180721
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  • 5
    Digitale Medien
    Digitale Medien
    The structure of hydrous Zr(IV) oxide-polyacrylate membranes: Poly(acrylic acid) deposition (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 22 (1978), S. 289-297 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The formation of hydrous Zr(IV) oxide-polyacrylate dynamic membranes was studied by the dependence of water flux decline and steady-state water flux on the concentration of poly(acrylic acid) in the feed. Analysis of the results indicates that the poly(acrylic acid) enters the pores of the hydrous Zr(IV) oxide layer, rather than forming a second layer. This configuration was consistent with scanning electron micrographs of the surface.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1978.070220121
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  • 6
    Digitale Medien
    Digitale Medien
    Production of cyclic molecules during the γ-irradiation of linear polydimethylsiloxane (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 9 (1971), S. 863-868 
    Details
    ISSN: 0449-2986
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1971.110091111
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  • 7
    Digitale Medien
    Digitale Medien
    Diffusion-controlled formation of porous structures in ternary polymer systems (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 17 (1979), S. 477-489 
    Details
    ISSN: 0098-1273
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: We propose a theory for the appearance of two-phase structures during the formation of polymer membranes from a casting solution immersed in a coagulant bath. Our model is based on diffusion induced phase separation at the spinodal in the ternary nonsolvent-solvent-polymer system. A simplified treatment of the interdiffusion process by the diffusion layer method permits the formulation of criteria for the formation of two-phase structures in the course of the solvent-coagulant exchange. Our criteria are expressed in terms of the composition dependence of the chemical potentials in the stable and metastable region of the ternary phase diagram. Comparison with experimental results shows qualitative similarities with theoretical predictions.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1979.180170312
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  • 8
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    Radiation chemistry of octamethyltrisiloxane (1971)
    American Chemical Society
    Details
    Publikationsdatum: 1971-08-01
    Print ISSN: 0022-3654
    Digitale ISSN: 1541-5740
    Thema: Chemie und Pharmazie , Physik
    Publiziert von American Chemical Society
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