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  • 1
    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: Die Polymerisation von Methylmethacrylat wurde in Gegenwart von Cupra-rayon, Wasser und Tetrachlorkohlenstoff durchgeführt; sie verläuft radikalisch. Der Einfluß der zugesetzten Mengen an Monomerem, Cupra-rayon, Wasser oder Tetrachlorkohlenstoff auf die Polymerisationsgeschwindigkeit wurde untersucht, und aus den ermittelten Werten der Geschwindigkeiten wurde die Bruttoaktivierungsenergie im Temperaturbereich zwischen 70 und 90°C zu 9,7 kcal/Mol geschätzt. Weiter wurde gefunden, daß n-Butylacrylat sowie-methacrylat auch von dem oben erwähnten System polymerisiert werden, während Styrol und Acrylnitril sich nicht polymerisieren lassen.
    Notes: Polymerization of methyl methacrylate was carried out in the presence of cupra-rayon, water and carbon tetrachloride. It was concluded that the process was of radical mechanism. The effects of the amount of methyl methacrylate, cupra-rayon, water or carbon tetrachloride on the rate of polymerization were investigated. From the rates of polymerization at 70-90°C, overall activation energy was estimated as 9.7 kcal/mole. n-Butyl acrylate and methacrylate were also polymerized by the above system. However, styrene and acrylonitrile did not polymerize.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2018-03-23
    Description: Author(s): Touru Yamauchi, Hiroaki Ueda, Kenji Ohwada, Hironori Nakao, and Yutaka Ueda A novel phase transition with a stepwise evolution of odd-number charge modulation is discovered in β -vanadium bronzes under pressures of about 1 GPa. All the charge modulation vectors of the many kinds of charge-ordered phases can be represented as a primitive lattice translation vector along the b axis multiplied by several odd numbers. This discovery demonstrates interplay between the charge degree of freedom and the crystallographic symmetry. This phenomenon is rationally explained by self-charge transfer (carrier redistribution) between two kinds of subsystems in the structure and sequential symmetry reduction as outlined in Landau theory of phase transitions. [Phys. Rev. B 97, 125138] Published Thu Mar 22, 2018
    Keywords: Electronic structure and strongly correlated systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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