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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 257-260 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This work is focused on laser modification of polymers with different angles ofincidence. Periodic surface structures generated by linearly polarized F2 laser light (157 nm) onpolyethyleneterephthalate (PET) were studied. Atomic force microscopy was used to study thetopological changes induced by the laser irradiation. The laser irradiation induces the formation ofperiodic ripple structures, the width of and the height being angle dependent. The periodic structureswere formed with the laser fluence 4.70 mJ/cm2. The laser modified PET foils were coated with a50 nm thick gold layer by sputtering. After Au deposition on the laser PET foils with ripplestructure, the roughness of surface decreases in comparison to PET with ripples without Au coating
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 567-568 (Dec. 2007), p. 261-264 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ablation, water etching and gold coating were studied on poly(ethyleneterephtalate)(PET) exposed to DC Ar plasma for 240 s at 8.3 W power. Au layers were sputtered on pristine andmodified PET and their adhesion and topography were investigated. The roughness and changes oftopography after plasma treatment, subsequent water etching and gold coating were followed usingAFM microscopy. The thicknesses of ablated layer and water dissolved layer were determined usinggravimetry. A nanoindentor was used to perform microstratch tests of sputtered layers. Waterdissolving of thin layer after plasma treatment was confirmed by FTIR spectroscopy. We havefound that under the present experimental conditions ca 30 nm thick layer of PET is plasma ablated.The surface topography changes dramatically and surface roughness increases. Another ca 16 nmthick layer was removed under present laboratory conditions after 24hour water etching. Subsequentcoating with 50 nm thick gold layer increases surface roughness in all cases of surface modification
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 482 (Apr. 2005), p. 391-394 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Permittivity of about 1 µm thin films prepared from polymethylmetactrylate (PMMA)solution doped with 20 % of diphenyl sulfoxide was studied. Permittivity of the films was measured as a function of the temperature. The measurement of the dependence of polarization on electrical field was performed using a standard Sawyer-Tower circuit. The presence of the dopant increases the composite permittivity namely above the PMMA glass transition temperature. Hysteresis loopsobserved on the measured polarization vs. electrical field dependence indicate easier and more pronounced polarizability of the composite comparing to pristine PMMA
    Type of Medium: Electronic Resource
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