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  • Bücher
  • Artikel  (3)
  • aggregate model  (2)
  • elastic tensor  (1)
  • Maschinenbau  (3)
  • 1
    Digitale Medien
    Digitale Medien
    New aspects of the single phase aggregate model for oriented polymers (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 1010-1016 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Oriented polymers ; elastic anisotropy ; aggregate model ; orientation parameters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract A reinvestigation of the single phase aggregate model (SPAM) of Ward applied to the elastic properties of uniaxially oriented polymers is presented. It is shown that the Voigt and the Reuss orientation average of elastic constants can be represented as a linear transformation in a 5-dimensional vector space. The corresponding transformation matrix can be diagonalized, showing that the eigenvalues of this transformation are the orientation parametersP 0 =1,P 2 andP 4 . Taking advantage of this representation an easy test of applicability of the SPAM is proposed. Possibilities to evaluate the SPAM parameters are reviewed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01410318
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): High performance Brillouin spectroscopy ; elastic tensor ; birefringence ; scattering geometries ; D-function
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01419544
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Structure and anisotropy in polycarbonate III. Study of elastic and optical properties of oriented samples with the method of high resolution Brillouin spectroscopy (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 761-773 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Polycarbonate ; oriented polymers ; elastic and optical anisotropy ; Brillouin spectroscopy ; aggregate model ; orientation parameters
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract High resolution Brillouin spectroscopy (BS) has been used to investigate elastic and optical properties of uniaxially drawn samples of polycarbonate (PC). The results are discussed in the framework of the single phase aggregate model (SPAM) of Ward. According to a recently developed evaluation technique, the SPAM parameters of PC are determined, resulting in the following elastic constants of the structural units:c 33 0 =33 GPa,c 11 0 =7 GPa,c 13 0 =9.7 GPa,c 44 0 =1.4 GPa, andc 66 0 =1 GPa. A nearly quadratic dependence of the orientation parameterP 4 onP 3 results, which can be explained by a modified pseudoaffine deformation scheme.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01418451
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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