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  • 64.70  (1)
  • UV absorption  (1)
  • Springer  (2)
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  • Springer  (2)
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    Electronic Resource
    Electronic Resource
    Solid-state thermochromism and piezochromism in the polysilylenes (1992)
    Springer
    Journal of inorganic and organometallic polymers and materials 2 (1992), S. 47-57 
    Details
    ISSN: 1572-8870
    Keywords: Sigma-conjugated polymers ; polymer conformation ; UV absorption ; thermochromism ; piezochromism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The polysilylenes exhibit complex solid-state structures and electronic properties. In this report the solid-state conformational structures of symmetrically substituted poly(di-n-alkylsilylenes) are described. Comparisons between the different structures and their respective UV absorption characteristics demonstrate that the relationship is complex and aspects of molecular geometry beyond chain conformation must be considered. The thermochromic and piezochromic behavior of several of these polysilylenes is discussed. The all-trans conformation of the silicon backbone is associated with both phenomena. The properties of several polysilylene copolymers have also been investigated. We find that some of the copolymers form a well-ordered structure and exhibit absorption characteristics similar to the crystalline phases of the corresponding homopolymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696535
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  • 2
    Electronic Resource
    Electronic Resource
    Optical recording using hydrogen phthalocyanine thin films (1985)
    Springer
    Applied physics 36 (1985), S. 71-79 
    Details
    ISSN: 1432-0630
    Keywords: 42.30 ; 64.70 ; 78.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Vacuum sublimed thin films of the blue dye hydrogen phthalocyanine (H2Pc) were incorporated into various optical recording structures. The dye was shown to be thermally, hydrolytically, and oxidatively stable. In all cases, the writing mechanisms are dependent on the sublimation of H2Pc. Several recording structures which take advantage of the sublimation property of H2Pc are demonstrated, including pit forming and bubble forming media. These H2Pc-based optical recording structures show very high optical contrast and low writing threshold energies. In addition, very thin films (50–75Å) of H2Pc were incorporated into a tellurium-based medium, which significantly enhanced the writing contrast observed in that medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620612
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