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  • 1
    Electronic Resource
    Electronic Resource
    On the nature of the luminescence emitted by a polypropylene film after interaction with a cold plasma at low temperature (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 937-943 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The light emitted by an insulating material once its surface has been submitted to a cold plasma, plasma-induced luminescence is investigated on polypropylene films at low temperature. An analysis of the integral and wavelength resolved light is carried out. The kinetical evolution of the spectrum after plasma interaction are reported and analyzed. Investigation of the photo- and chemiluminescence spectra of the material shows that plasma-induced luminescence has three spectral components, each having different excitation mechanisms and thus different kinetics. The fastest is due to the ultraviolet irradiation during plasma contact, the second is dominated by radical chemistry producing carbonyl groups, and the third, with the slowest kinetics, is due to carrier recombination on the most conjugated chromophores which are preferentially charged by the plasma. To confirm the interpretation of plasma induced luminescence spectrum, the first results concerning short and long plasma interaction are considered. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364186
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison Between Air Filamentary and Helium Glow Dielectric Barrier Discharges for the Polypropylene Surface Treatment (1998)
    Springer
    Plasmas and polymers 3 (1998), S. 43-59 
    Details
    ISSN: 1572-8978
    Keywords: Atmospheric pressure glow discharge ; dielectric controlled barrier discharge ; silent discharge ; corona treatment ; polymer surface activation ; surface energy
    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 Recently, a glow like dielectric controlled barrier discharge (GDBD) working at atmospheric pressure has been observed. Such a discharge could replace a filamentary dielectric controlled barrier discharge (FDBD) used in corona treatment systems to improve the wettability or the adhesion of polymers. So it is of interest to compare these two types of discharges and their respective effect on a polymer surface. This is the aim of an extensive study we have undertaken. The first step presented here is the comparison of a filamentary discharge in air with a glow discharge in helium. Helium is the most appropriate gas to realize a glow discharge at atmospheric pressure. Air is the usual atmosphere for a corona treatment. The plasma was characterized by emission spectroscopy and current measurements. The surface transformations were indicated by the water contact angle, the leakage current measurement and the X-ray photoelectron spectroscopy. Results show that the helium GDBD is better than air FDBD to increase polypropylene wettability without decreasing the bulk electrical properties below a certain level. Contact angle scattering as well as leakage current measurements confirm that the GDBD clearly results in more reproducible and homogeneous treatment than the FDBD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022582017499
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrasonic measurement of relaxation behavior in polystyrene (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 34 (1996), S. 341-348 
    Details
    ISSN: 0887-6266
    Keywords: ultrasonic measurement ; polystyrene ; glass transition ; relaxation ; Havriliak-Negami model ; Kauzmann temperature ; fragile glass ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We report measurements of the temperature and pressure dependence of ultrasonic modulus and specific volume in polystyrene between 50 and 280°C and applied pressures up to 775 bar. The volumetric glass transition temperature is found to vary linearly with pressure. Furthermore, it coincides with the temperature at which the velocity of sound and the attenuation in the material show pronounced change from solid-like to liquid-like behavior. The storage and loss moduli are analyzed within the Havriliak-Negami model and very good agreement is found over the entire temperature and pressure ranges. Using the Vogel-Tammann-Fulcher equation for the relaxation time, the Kauzmann temperature Tk and the fragility parameter D of polystyrene were determined from fits to the data. Tk is also a linear function of pressure, but D is constant over the whole pressure range. The value of D allows us to classify polystyrene among the fragile-glass formers. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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