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  • Polymer and Materials Science  (3)
  • Glutathione  (1)
  • PC  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Extracellular glutathione and γ-glutamyl transpeptidase prevent H"2O"2-induced injury by 2,3-dimethoxy-1,4-naphthoquinone
    Amsterdam : Elsevier
    Free Radical Biology and Medicine 15 (1993), S. 57-67 
    Details
    ISSN: 0891-5849
    Keywords: Free radicals ; Glutathione ; Oxidative stress ; Quinone ; γ-Glutamyl transpeptidase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0891-5849(93)90125-E
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Polymer treatment in the flowing afterglow of an oxygen microwave discharge: Active species profile concentrations and kinetics of the functionalization (1995)
    Springer
    Plasma chemistry and plasma processing 15 (1995), S. 173-198 
    Details
    ISSN: 1572-8986
    Keywords: Singlet molecular oxygen ; atomic oxygen ; flowing afterglow ; downstream reactor ; microwave discharge ; PP ; PF ; PC ; hexatriacontane ; octadecyloctadecanoate ; functionalization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract The surface treatment of different polymers and their corresponding model surfaces in the flowing afterglow of an oxygen microwave plasma is investigated. The concentration profiles of tire long-lived species issued from the plasma are measured and calculated in the downstream area The influence of atomic and singlet molecular oxygen in the behavior of different polymers is investigated. It appears that the evolution of the surface energy can be explained by an initiation of the functionalization by the oxygen atoms impinging upon the surface followed by reaction of the radicals formed with molecular oxygen. The concentration of functions at the sureface is limited due to their destruction by reaction with oxygen atoms. Furthermore, the functionalization level is higher in the /lowing afterglow than in the plasma, without any significant degradation of the polymer surface. Therefore, the treatment in the flowing afterglow is more efficient to increase suface energy in particular, for polymers which undergo high backbone chain scission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01459695
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Interactions of polymer model surfaces with cold plasmas: Hexatriacontane as a model molecule of high-density polyethylene and octadecyl octadecanoate as a model of polyester. I. Degradation rate versus time and power (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 1955-1966 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: To gain a better understanding of the evolution of polymer surfaces under cold plasmas, model polymer surfaces were studied. The degradation products and the gas phase were investigated by mass and optical emission spectrometry. Their evolution versus time and power enable us to propose a mechanism that involves atomic oxygen, OH* and H* radicals. © 1992 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070461108
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  • 4
    Electronic Resource
    Electronic Resource
    Study of the interactions of model polymer surface with cold plasmas. II. Degradation rate versus pressure and gas flow rate (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 2063-2074 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This work deals with the influence of pressure, gas flow rate, and gas mixture on the etching rates of polymer model molecules such as hexatriacontane (C36H74) and octadecyl octadecanoate (OOD) treated in an oxygen or argon plasma. Mass spectrometry and optical emission spectroscopy have been used to monitor the formation and evolution of the fragments coming from chain breaking in terms of their concentration and emission intensity, respectively. It was demonstrated that pressure and gas flow rate are two important parameters in the interaction of cold plasmas and of polymer surfaces. The results obtained can be explained by combined effects such as electron energy and its density, residence time, “quenching effect,” as well as chemical reactions. © 1992 John Wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070461201
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  • 5
    Electronic Resource
    Electronic Resource
    Angle-resolved XPS study of plasma-treated teflon PFA surfaces (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 23 (1995), S. 99-104 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Teflon PFA (polytetrafluoroethylene-co-perfluoroalkoxy vinyl ether) was treated by a low-pressure microwave (2.45 GHz) plasma in O2, N2, H2, He and their mixtures. X-ray photoelectron spectroscopy measurements showed ablation of fluorine and incorporation of new O- and N-containing groups into the surface. Among the different gases, H2 is the most efficient for defluorination, N2 + H2 for surface functionalization, while O2 showed the least performance for both effects. Plasma treatments using N2 + H2 and O2 + H2 resulted in intermediate defluorination, i.e. between those in the pure gases, and sequential treatment by He/(N2 + H2) showed an additive effect of He and N2 + H2 alone. Angle-resolved XPS measurements revealed a pronounced gradient in the near-surface composition following H2, N2 + H2 and He/(N2 + H2) plasma treatments, in contrast to a more uniform depth distribution upon O2, N2 and He exposures. The surface modification of Teflon PFA leads to an enhanced adhesion of metals such as Cu, Ag and Au.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740230209
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