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  • 1
    Electronic Resource
    Electronic Resource
    The elastic properties of hexatriacontane single crystals at their various phase transitions (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 409-411 
    Details
    ISSN: 1435-1536
    Keywords: n-alkane ; single crystal ; elastic tensor ; phase transition
    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 For the first time directly measured elastic tensor components of C36H74 single crystals are presented as a function of temperature. The data are compared to theoretical results obtained for polyethylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418214
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Structure transformation behaviour of polymer melts investigated by Brillouin spectroscopy (1981)
    Springer
    Colloid & polymer science 259 (1981), S. 215-219 
    Details
    ISSN: 1435-1536
    Keywords: Phasetransition ; Polymer-melt ; Brillouin spectroscopy ; Viscosity-measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01381763
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The ferroelastic transition of betaine fumarate (1995)
    Springer
    The European physical journal 97 (1995), S. 133-138 
    Details
    ISSN: 1434-6036
    Keywords: 62.20.D ; 78.30 ; 64.70.K
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Investigations of polarized Raman spectra of orthorhombic betaine fumarate crystals revealed the existence of two low-frequency optic modes which soften slightly on approaching the ferroelastic transition temperatureT c ≈194 K. The eigenvectors of these modes withB 1g -andB 2g -symmetry, respectively, are coupled bilinearly to strains of corresponding symmetries leading to renormalized elastic moduli. It is shown that these couplings account quantitatively for the temperature dependences of the modulic 55andc 66and eventually lead to a ferroelastic transition and a spontaneous shear straine 5s .By optical and dielectric measurements it is confirmed that the transition is of second order and follows a classical Landau behaviour with a critical exponent of the order parameter of 0.5 within experimental error.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01317597
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Simultaneous determination of elastic and optical properties of polymers by high performance Brillouin spectroscopy using different scattering geometries (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 403-414 
    Details
    ISSN: 1435-1536
    Keywords: High performance Brillouin spectroscopy ; elastic tensor ; birefringence ; scattering geometries ; D-function
    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 General aspects of high performance Brillouin spectroscopy in polymers using special scattering geometries such as 90A-scattenng geometry are discussed. Technical improvements are reported resulting in absolute accuracies up to 0.05 % for sound velocity determination. A method of data analysis is presented delivering simultaneously the complete set of elastic stiffness constants. The influence of birefringence on the Brillouin line shifts in anisotropic polymeric systems is estimated and techniques to reduce this influence are proposed. The determination of the principal refractive indices by Brillouin spectroscopy is discussed. Furthermore, a quantityD X , which is sensitive to hypersonic relaxation processes, is introduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01419544
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    Paper (German National Licenses)
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