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  • Polymer and Materials Science  (1)
  • Pyrazole  (1)
  • 1995-1999  (2)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 56 (1995), S. 311-316 
    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: Results of phenomenological study into the forms of surface failure of poly(methylmethacrylate) (PMMA) are presented. Surface failure of the polymer resulted from rolling contact fatigue produced in a model configuration consisting of a PMMA disc with nominally flat surface loaded against three steel balls able to roll free over the surface of the disc. It was found that the performance of the polymer under the test conditions used is influenced by lubricating medium and the main form of failure is of surface fatigue type. © 1995 John Wiley & Sons, Inc.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1981-1985 
    ISSN: 1434-1948
    Keywords: Pyrazole ; Silver ; Metallacycles ; Macrocycles ; Self-assembly ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 2,6-bis(pyrazolyl)pyrazine ligand 1 forms a 2,2-metallamacrocycle 3, composed of two ligands and two cations, in the presence of the Ag+ cation. In the crystalline phase, the 1,3,5-tris(pyrazolyl)benzene ligand 2 leads to an infinite metallatubular network in the presence of the Ag+ cation, composed of the 2,2-metallamacrocycle 4, which is formed from two molecules of 2 and two cations. This infinite network is formed by double interconnection of consecutive metallamacrocycles through binding of Ag+ centers by the free pyrazolyl moieties.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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