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  • 1
    Electronic Resource
    Electronic Resource
    Correlations between gas permeation and free-volume hole properties probed by positron annihilation spectroscopy (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 2365-2371 
    Details
    ISSN: 0887-6266
    Keywords: positron annihilation ; positronium ; free volume ; hole ; gas permeation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Free-volume hole sizes, fractions, and distributions in a series of polycarbonate-based polymers are measured by using positron annihilation lifetime (PAL) spectroscopy. Correlations between the obtained free-volume hole properties and gas diffusion coefficients are observed. © 1995 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090331708
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  • 2
    Electronic Resource
    Electronic Resource
    Direct measurement of free-volume hole distributions in polymers by using a positronium probe (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 1359-1364 
    Details
    ISSN: 0887-6266
    Keywords: free-volume distributions measured with positronium probe ; polypropylene, free-volume hole distributions in ; positron lifetime spectra and free-volume hole distribution in polypropylene ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We have directly measured the free-volume hole distributions in semicrystalline polypropylene by positron lifetime annihilation spectroscopy. A Laplace inversion technique was engaged to analyze the positron lifetime spectra measured under quasi-isotropic external pressures of 0, 4.2, and 14.7 kbar into continuous lifetime distributions. The hole radii distributions as determined from the ortho-positronium lifetime distributions are found to be between 4.0 and 0.5 Å and to have maxima at 3.0, 1.9, and 1.1 Å under the external pressures of 0, 4.2, and 14.7 kbar, respectively. © 1992 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090301206
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  • 3
    Electronic Resource
    Electronic Resource
    Small-angle X-ray scattering studies of Nafion®/[silicon oxide] and Nafion®/ORMOSIL nanocomposites (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 1917-1923 
    Details
    ISSN: 0887-6266
    Keywords: SAXS ; Nafion® ; ORMOSIL ; sol-gel reaction ; nanocomposite ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The small angle X-ray scattering technique was used to probe structural heterogeneity on the scale of nanometers within Nafion®/[silicon oxide], Nafion®/[ORMOSIL], and Nafion®/[dimethylsiloxane] hybrid membranes. The results of this study reinforced the working hypothesis of morphological template action for the in situ growth of silicon oxide, or organically modified silicon oxide phases in perfluorosulfonate ionomers via sol-gel reactions for silicon alkoxide or/and silicon alkylalkoxide precursors. Nanophase separation persists when incorporated silicon oxide particles are postreacted with ethoxytrimethylsilane but postreaction with diethoxydimethylsilane generates co-continuous phases that do not generate ionomer SAXS peaks, presumably due to a more homogeneous Si atom distribution within the ionomer. These hybrids are true nanocomposites, as structural heterogeneity exists on the scale of ∼ 5 nm. The variation of the small angle upturn for these hybrids is explained in terms of long-range inhomogeneities in ionomers. © 1996 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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