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  • Wiley-Blackwell  (3)
  • 1990-1994  (2)
  • 1975-1979  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of poly[2,3,9,10,16,17,23,24-octakis(dodecyloxycarbonyl)phthalocyaninatogermoxane] (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 493-500 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: In this article we describe the preparation of poly[2,3,9,10,16,17,23,24-octakis(dodecyloxycarbonyl)phthalocyaninatogermoxane] by thermal polycondensation of 2,3,9,10,16,17,23,24-octakis(dodecyloxycarbonyl)phthalocyaninatogermanium dihydroxide, and its characterization. The average molar mass of the resulting polymer was determined. High molar masses are assessible, e.g., M̄w = 360000 g/mol, M̄n = 140000 g/mol, at moderate temperature for the polycondensation (200°C). The polymer shows a liquid-crystalline phase in an extremely large temperature range. Furthermore, Langmuir-Blodgett films (LB films) of the polymer and of the monomer were prepared and characterized. In LB films the phthalocyanine rings are preferentially oriented normal to the dipping direction.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940212
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of high-molecular-weight poly(dimethylsiloxane) of uniform size by anionic polymerization, 1. Initiation by a monofunctional lithium siloxanolate (1992)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 193 (1992), S. 2453-2466 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: An improved procedure for the anionic polymerization of hexamethylcyclotrisiloxane (D3) initiated by a monofunctional lithium derivative is reported. The initiator seeding solution is preferably prepared in benzene, and tetrahydrofuran is used as a cosolvent which makes the presence of additional promoters useless. The main advantage of this procedure is that it delays the appearance of bimodality which is believed to result from a sudden change in aggregate molecularity during the course of the reaction. Applying this method, poly(dimethylsiloxane) samples having a single functional endgroup and possessing high molecular weights and narrow molecular weight distributions (1,03 ≤ M̄w/M̄n ≤ 1,06) were prepared on the 100 g scale.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1992.021930928
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  • 3
    Electronic Resource
    Electronic Resource
    Probing DNA quaternary ordering with circular dichroism spectroscopy: Studies of equine sperm chromosomal fibers (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 573-582 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies are described which strongly support a cholesteric liquid crystal-like quaternary structure for the DNA molecules of a biologically native chromosomal preparation from equine sperm cells. Discrete chromosomal fibers released from the head pieces of equine spermatozoon cells were prepared intact and probed for liquid crystalline ordering using reflectance and linear dichroism spectroscopy. Assuming cholesteric liquid crystalline order for the DNA molecules within the chromatin fibers, parameters measured experimentally were used to calculate the circular dichroism (CD) of the fibers. The calculated results compare remarkably well with the experimentally measured CD of the sperm chromosomal fibers and suggest a specific cholesteric liquid crystal-like quanternary structural ordering of DNA molecules in equine sperm chromatin fibers. The potential of CD spectroscopy as a tool for the study of long-range ordering of macromolecules is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160308
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