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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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Segmented block copolymers of uniform chain length and defined structure, 2Part 1: cf.7.. Investigation of some physical propertiesDedicated to Professor H.-J. Cantow on his 60th birthday (1984)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 185 (1984), S. 1469-1491 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Some physical investigations of segmented block copolymers of uniform chain length and defined structure and their constituents are described. Special attention was payed to the thermal behaviour of these new substances with respect 1. to the phase transformations in the solid and liquid state and 2. to the thermal stability of the materials. Several of these oligomers show phase transitions in the solid state. In some instances, the morphology of the solid material depends strongly on the sample history. The influence of the crystallization conditions is discussed. For the special case of esters of 4,4′-isopropylidenediphenol (bisphenol A) with isophthalic acid detailed investigations by dielectric and Brillouin spectroscopy of the glass-forming process are presented.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1984.021850719
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  • 4
    Electronic Resource
    Electronic Resource
    Elastic properties of thin ultraoriented poly(ε-caprolactone) films grown on ptfe substrates as revealed by Brillouin spectroscopy (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 1173-1176 
    Details
    ISSN: 0887-6266
    Keywords: poly(ε-caprolactone) films on highly oriented PTFE substrate ; Brillouin spectroscopy of ultraoriented poly(ε-caprolactone) films ; crystallization of ultra-oriented poly(ε-caprolactone) on PTFE sustrate ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090301012
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  • 5
    Electronic Resource
    Electronic Resource
    About the microstructure of PCVD prepared crystal mats of statistical oligo-vinylidene-fluoride-trifluoroethylene in relation to other fluorinated polymers (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 33 (1995), S. 237-246 
    Details
    ISSN: 0887-6266
    Keywords: oriented fluoro-oligomers ; chemical vapor deposition ; ferroelectricity ; glass transition ; Brillouin spectroscopy ; x-ray diffraction ; vinylidene fluoride ; trifluoroethylene ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The room temperature phase of the physical/chemical vapor-deposited statistical co-oligomer VDF/TrFE(70/30) has been characterized by different experimental methods such as small-angle x-ray scattering, wide-angle x-ray diffraction, size-exclusion chromatography, infrared absorption and optical refractometry. The characterization of the elastic properties was carried out using high-performance Brillouin spectroscopy in connection with special scattering geometries. The co-oligomer VDF/TrFE(70/30) was obtained by cracking the parent statistical copolymer and subsequently vapor depositing the shortened chains on highly oriented PTFE substrates (PIA-technique). The room temperature phase of the resulting oriented waxy crystal mats of VDF/TrFE(70/30) is predominantly ferroelectric. The physical properties are very different to those of similarly PIA-prepared n-alkanes, perfluoroalkanes, and blockfluoroalkanes. The microstructure of VDF/TrFE(70/30) is interpreted in terms of partially crystalline nano-sized structures giving rise to a marked freezing process below room temperature. © 1995 John wiley & Sons, Inc.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1995.090330208
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  • 6
    Electronic Resource
    Electronic Resource
    Poisson ratios and upper bounds of intrinsic birefringence from brillouin scattering of oriented polymers (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 1477-1485 
    Details
    ISSN: 0887-6266
    Keywords: oriented polymers ; Poisson's ratio ; intrinsic birefringence ; sound velocity ; elastic constants ; Brillouin scattering ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: To overcome the difficulties in measuring high-frequency shear constants of polymeric materials by ultrasonic or Brillouin scattering technques, we extrapolate results from oriented materials to zero birefringence. Shear constants C44 in the high-frequency limit (GHz) are determined for polyethylene, poly(ethylene terephthalate), poly(vinyl chloride), poly(methyl methacrylate), and polycarbonate using Brillouin scattering. Accurate values of Poisson's ratio are derived. The extrapolation to full orientation using an amended Moseley relation gives upper bounds for the “intrinsic birefringence.” Changes in the character of the orientation process are easily detected by monitoring the mode numbers, which are defined by analogy to Poisson's ratio. Extrapolation of these ratios to their upper bound 0.5 gives an independent check of the maximum intrinsic birefringence. © 1993 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090311105
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and properties of semicrystalline polymers via high-frequency acoustic and x-ray measurements. I. Ferroelectric P(VDF/TrFE) copolymer (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 31 (1993), S. 505-512 
    Details
    ISSN: 0887-6266
    Keywords: ferroelectric copolymers ; Brillouinspectroscopy ; irradiation ; acoustic properties ; molecular orientation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Acoustic, opto-acoustic, and x-ray investigations have been performed in order to study the influence of irradiation, electrical poling, and mechanical orientation on the morphology of ferroelectric random copolymers of vinylidene fluoride and trifluorethylene {P[VDF/TrFE] (70/30)}. The influences of these different treatments on the molecular orientation distribution of the amorphous and crystalline phases are discussed, as well as their influences on the crystallinity of the material. The elastic stiffness and the related viscosity tensors of P[VDF/TrFE] (70/30), the elastic stiffness modulus of the amorphous matrix, and the hierarchy of stiffness constants of the crystalline state have been determined. © 1993 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1993.090310501
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  • 8
    Electronic Resource
    Electronic Resource
    Theoretical birefringence of ultraoriented polyethylene from model structure calculations (1982)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 20 (1982), S. 1193-1205 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The birefringence of model structures of ultraoriented polyethylene has been calculated by using the point-dipole concept and the polarizability tensor of the methylene group derived recently by Pietralla. For well-oriented chains the birefringence is determined by the combination of a negative anisotropy of the polarizability tensor of the methylene group and a positive anisotropy of the Lorentz tensor, both with respect to the chain direction. As a consequence it decreases with increasing density. The results are in agreement with experimental values of Mead, Desper, and Porter. In the model the amorphous regions are regarded as a mixture of planar and helical segments arranged in nematiclike bundles which additionally may have a certain distribution of orientation. The birefringence is not much affected by defects which, on the other hand, strongly influence the ultimate mechanical properties.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1982.180200707
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