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  • 1
    Electronic Resource
    Electronic Resource
    Studies on the nature of order in a rigid random copolymer (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 651-663 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The transition from the nematic melt to the solid state in a rigid rod-like copolymer was found to be characterized by unusual thermodynamic and kinetic properties. The transition occurred with negligible volume changes. The enthalpy and the entropy of the transition were found to be lower by at least one order of magnitude in comparison to the values usually observed for a crystal to nematic transition. The ordered solid state displays a glass transition and its structure is characterized by high symmetry, i.e., an orthorhombic one. Dielectric relaxation studies, investigations on the plastic flow properties of the solid state and studies on the dynamical mechanical properties revealed a high degree of rotational freedom already at room temperature in the solid state. These experimental findings led us to the conclusion that the solid state displays a three-dimensional positional long range order but is rotationally disordered with respect to rotations about the long axes of the rod-like molecules. The structure is similar to those of plastic crystals known for spherical molecules such as cyclopentane, or to smectic E modifications known for rod-like molecules. Also the properties reported above for the rod-like copolymers resemble those reported in the literature for plastic crystals.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880317
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermotropic liquid crystalline polymersPaper presented at the meeting of the GDCh-Fachgruppe “Makromolekulare Chemie” on “New Polymers-special properties-modern technologies” in Bad Nauheim (W-Germany) on April 14/15 1986. (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 145 (1986), S. 231-257 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Rigid chain molecules have the tendency to display fluid liquid crystalline phases within a limited temperature range. This range depends on the particular chemical structure of the chain molecules. The chain rigidity as well as the intrinsic dynamical and elastic properties of the liquid crystalline melt can successfully be used to obtain high strength, high stiffness polymers, which can be melt processed. The rigid chain polymers display unusual thermodynamical, dynamical, structural, rheological and mechanical properties.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1986.051450113
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structure formation in a rigid chain polymer (1985)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 6 (1985), S. 821-827 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1985.030061206
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    Paper (German National Licenses)
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