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  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 126 (1969), S. 73-86 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The synthesis of 4-vinylbiphenyl and 11-vinyl-p-terphenyl was performed by a simple synthetic route. By reaction of the corresponding alcohols with methanesulfonyl chloride in pyridine the vinyl compounds could be prepared by a one step reaction.Investigation of the radical copolymerisation of the monomers with styrene showed a favoured incorporation of 4-vinylbiphenyl and 12-vinyl-p-terphenyl into the polymer chain in contrast to the behaviour of 11-vinyl-p-terphenyl.
    Notes: Für die Darstellung von 4-Vinyldiphenyl und 11-Vinyl-p-terphenyl wurden einfache, verallgemeinerungsfähige Synthesen ausgearbeitet. Durch Umsetzung entsprechender Carbinole mit Methansulfonsäurechlorid in Pyridin gelang die Darstellung der Vinylverbindungen in einer einstufigen Reaktion.Die Untersuchung der radikalischen Copolymerization der Monomeren mit Styrol ergab bei 4-Vinyldiphenyl und 12-Vinyl-p-terphenyl einen bevorzugten Einbau in die Polymerketten, während 11-Vinyl-p-terphenyl nur in untergeordnetem Maße in Polystyrolketten eingebaut wurde.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-07-17
    Description: We report preliminary results of a massive investigation of the striation patterns observed in the dust tail of comet Hale-Bopp in March and April 1997. Our findings are based on 16 wide-field photographs taken with Schmidt cameras on March 2-20, with six more, from March 31-April 8, still waiting for analysis. Altogether approximately 700 individual striae were examined on the 16 images, which were scanned and computer processed to enhance the morphology. About 5300 stria points, or some 7-8 points per stria per image on the average, were measured and their astrometric positions determined and subsequently converted to a Cartesian coordinate system, aligned with the comet's projected radius vector and centered on the nucleus. The evolution of the striated tail has been studied using the Sekanina-Farrell fragmentation hypothesis (AJ 85, 1538, 1980), previously applied to other comets. This two-step model is characterized by the time of release from the nucleus of a parent object (or objects) whose motion is assumed to have been subjected to a constant repulsive acceleration beta(sub p) (presumably due to solar radiation pressure) until the time of fragmentation.
    Keywords: Astrophysics
    Format: text
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