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  • 1
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 278 (2000), S. 629-636 
    ISSN: 1435-1536
    Keywords: Key words Nanocomposites ; Polyamide ; Clay ; Rheology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Nanocomposites based on polyamide-12 (PA-12) and layered silicates are synthesized and analyzed with respect to their morphological and rheological properties. Transmission electron microscopy shows the fine dispersion of silicate layers in a PA-12 matrix. Different swelling agents for the clay (protonated aminododecanoic acid or water) are used. This allows the molar mass of PA-12 to be controlled during the preparation of the nanocomposites. When aminododecanoic acid is used as a swelling agent, the exfoliated silicate layers are chemically bonded to the matrix, whereas the use of water as a swelling agent leads to exfoliated silicate layers well dispersed in the polymer matrix without tethered polymer chains. The rheological behavior of the nanocomposites differs extremely from that of the pure PA-12 matrices. A qualitative description of the rheology of these nanocomposites is provided.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract NiCrAlY bond coat and ZrO2–8 wt% Y2O3 top coat with various thicknesses were deposited on Hastelloy X by plasma spraying. Residual stress was calculated by the finite element method (FEM) to explain the variations in the bond strength and thermal fatigue characteristics with the thickness of the bond coat and top coat. The bond strength of thermal barrier coatings (TBCs) increased with decreasing maximum residual stress in the y-direction of the top coat. The thermal fatigue characteristics increased with decrease of the maximum principal residual stress of the top coat and the thickness of oxidation layer of the bond coat.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 1391-1403 
    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: Deformation and fracture processes of two types of modified polypropylenes (PPs) were investigated in situ by high voltage electron microscopy (HVEM, 1 MV) and scanning electron microscopy (SEM). One type of PP modified with ethylene-propylene block co-polymer rubber (EPR) showed a variation in particle size and interparticle distance with content of ethylene. In the other series of modified PP, Al2O3 filler particles with concentrations of 10 and 60 wt % were used. The micromechanical toughening mechanism was comparable in both types. Deformation structures in both systems are closely connected with cavitation and void formation: the systems modified with EPR show void formation inside the modifier particles; in the systems modified with Al2O3, debonding occurs at the interface between the particles and the matrix. Additionally, the effect of the morphology of the modifier particles on micromechanical deformation processes was studied. The experiments showed that besides particle size and center-to-center distance between particles, the ratio of center-to-center distance to particle diameter plays an important role. Models (three-stage mechanism) for the micromechanical deformation process are proposed. © 1996 John Wiley & Sons, Inc.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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