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  • 1
    Electronic Resource
    Electronic Resource
    Effect of substrate on shearing properties of ultrathin polymer films (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 328-333 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00037a060
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of monomer architecture on the shear properties of molecularly thin polymer melts (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2346-2351 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effective viscosity and shear behavior of ultrathin films of two structurally different perfluoropolyether fluids have been investigated. The materials used were Fomblin Z, a linear random copolymer of fluoroethylene oxide and fluoromethylene oxide, and Fomblin Y, a branched random copolymer with fluoropropylene oxide and fluoromethylene oxide monomer units. The shearing experiments were conducted with the fluids confined between molecularly smooth surfaces at shear rates ranging from 200 to 4×103 s−1. It was found that when the thickness of the fluid films decreases from 10 to 2 nm, both perfluoropolyethers exhibited a sharp increase in viscosity, from bulk values to "surface viscosity'' values that are many orders of magnitude larger. With increasing shear rates, the Z-type fluid showed a gradual decrease in the shear stress indicating an apparent ordering of the molecules due to the applied shear forces. On the other hand, with the Y-type copolymer, the shear stresses were significantly lower and were proportional to the shear rate resembling Newtonian fluids. The results are explained in terms of the differences in the molecular architecture of the fluids and suggest a close relation between the molecular structure of the polymer melt near a solid wall and its frictional and lubricating properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459906
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrathin particulate magnetic recording media (abstract) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3898-3898 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper presents a novel method of producing an ultrathin and highly oriented particulate magnetic recording medium. The process involves the laying down of a monolayer of magnetically aligned particles where the thickness of the layer is limited only by the diameter of the magnetic particles. Thus, using commercially available magnetic particles, a 50–100-nm-thick magnetic layer can be produced. The particle deposition process depends on electrostatic interactions of charged particles with an oppositely charged disk surface in an aqueous medium. In order to reduce the tendency of the magnetic particles to aggregate, the particles are stabilized by adsorbed colloidal silica. Particle volume concentration (PVC) is higher than usually realized with conventional particulate media and it was measured in excess of 50%. A typical particulate monolayer has an Ms of 1.6×10−3 emu/cm2 and the orientation ratio (Mr/Ms) of 4–4.5. Resolution, at 150-nm flying height, was measured at 1200 fc/mm with a high signal-to-noise ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338603
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Experiments with soap-free polymerization of styrene in the presence of alcohols (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 3077-3086 
    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: Polystyrene latexes have been synthesized by a method based on that Kotera et al.4 The polymerization rates and yields have been improved by the addition of an alcohol (methanol) to the reactants. The effects of varying the methanol content and other process variables on the polymerization and on the properties of the latex are reported.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070191112
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