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  • Chemical Engineering  (1)
  • PTMSP aging  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Positron annihilation lifetime (PAL) in poly[1-(trimethyl-silyl)propine] (PTMSP): Free volume determination and time dependence of permeability (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 357-367 
    Details
    ISSN: 0887-6266
    Schlagwort(e): PAL spectroscopy ; poly[1-(trimethyl-silyl)propine] (PTMSP) ; polymer free volume ; PTMSP aging ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: PTMSP membranes were prepared and characterized. The mean molecular weight of the polymer was found to be 450,000 Da. Time dependence of the density, mechanical properties, IR spectra, DSC, PAL, and permeability data of the polymer and membranes are presented. A detailed analysis of PAL results for PTMSP samples under vacuum, in air, oxygen, and nitrogen atmosphere is presented with the aim to investigate the influence of the external atmosphere on the experimental PAL measurements and to determine correctly the size and the number of the free volume holes. From all the experimental data a model of a channel network is proposed for PTMSP with large holes (mean radium r = 0.75 nm) connected by channel-like holes (mean radium 0.45 nm). The number of large holes decreases by ageing, but not their size, whereas the number of small holes does not change but their size decreases. According to our model the decrease in the permeability of PTMSP with time could be caused by the decrease of the size of the channel-like holes. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Elastic moduli and failure mechanism of composites made of spherical glass beads, of polyethylene using poly (4-vinylpyridine graft butylacrylate) as an interface agent (1988)
    Brookfield, Conn. : Wiley-Blackwell
    Polymer Composites 9 (1988), S. 252-262 
    Details
    ISSN: 0272-8397
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: Graft polymers were prepared by copolymerization of double bond terminated long chain poly(vinylpyridine), endowed with polar units interacting with glass, and butylacrylate (BA) having short groups interactive with polyethylene. These polymers were used to coat A glass beads which were mixed with polyethylene (PE) to obtain glass-PE-composites. Good adhesion due to the presence of the adhesive polymer, and to a glass hydrolyzing pretreatment, permits higher elastic moduli and higher tensile strengths than in their absence. The adhesive composition has some influence especially on the yield stress which is higher when using the g-polymer endowed with longer BA branches. Theoretical predictions of the moduli are discussed and do not give satisfactory results when compared with the experimental values, except at low concentrations. Failure is observed to begin in the polar zone and its mechanism appears to be dependent on the presence or absence of adhesive.The experimental stress and strain at the beginning of failure are lower for untreated fillers. The specific volume variation \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{{\Delta V}}{{V_O }} $\end{document} during the tensile test appears to be an important index of adhesion. Both the critical strain at which detachment begins and the slope of the \documentclass{article}\pagestyle{empty}\begin{document}$ \frac{{\Delta V}}{{V_O }} $\end{document} curve can be assumed as effective adhesion indexes.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pc.750090403
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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