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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for a liquid-liquid transition in a liquid crystalline side group polymer obtained by Brillouin spectroscopy and dsc
    Amsterdam : Elsevier
    Physics Letters A 114 (1986), S. 51-53 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(86)90342-7
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: Oriented polymers ; elastic anisotropy ; aggregate model ; orientation parameters
    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 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410318
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  • 3
    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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  • 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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  • 5
    Electronic Resource
    Electronic Resource
    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
    Keywords: Polycarbonate ; oriented polymers ; elastic and optical anisotropy ; Brillouin spectroscopy ; aggregate model ; orientation parameters
    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 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01418451
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  • 6
    Electronic Resource
    Electronic Resource
    Brillouin spectroscopy at the melt transition of poly-4-methyl-pentene-1: Discontinuous melting of superstructures? (1981)
    Springer
    Polymer bulletin 4 (1981), S. 591-596 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The elastic properties of Poly-4-methylpentene-1 around the melt transition have been studied by Brillouin spectroscopy. A discontinuous change of the sound velocity is observed in the melting region of 10 K indicating a rather discontinuous melting and formation of spherulites with sharp boundaries. Another result is that practically the final elastic properties of the spherulites appear already during their formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256286
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  • 7
    Electronic Resource
    Electronic Resource
    The orientational state of uniaxially stretched PMMA (1988)
    Springer
    Colloid & polymer science 266 (1988), S. 692-700 
    Details
    ISSN: 1435-1536
    Keywords: PMMA ; orientation ; fourth moment ; sound velocity ; Brillouin scattering
    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 Uniaxially stretched samples of PMMA were investigated by Brillouin Spectroscopy (BS). From the velocity of hypersound we could determine most of the elastic constants. Using a recently developed analysis [1] it is demonstrated that the properties of this polymer can be well described by the aggregate model. This result offers the possibility of mapping the mechanical properties by birefringence measurements. The dependence of the fourth momentP 4 on the second momentP 2 is identical with that determined for PC [2] and follows, in the measured range, that of an affine orientational state. Nevertheless, the dependence on the stretching ratio differs for different molecular weights. Thus the partition of the deformation into an orientational and an elongational contribution, as has been proposed [3], seems to be well founded. The partition depends on the stretching conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410278
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    Paper (German National Licenses)
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