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  • 1
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 6 (1984), S. 93-106 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A structon model of supercrystals for describing the dynamic properties and multiple phese transitions of superlattices, formed in systems of block copolymers with segregated domains, is applied and experimentally substantiated.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Entstehung und Schmelzen einer Übergitterstruktur in homodispersen Styren-Butadien-Blockopolymeren wurde mit der Kleinwinkelneutronenstreuung untersucht. Das Übergitter dieser Copolymere wird durch hexagonal angeordnete Polystyrenzylinder gebildet. In Übereinstimmung mit früheren Voraussagen tritt in dem Übergitter keine thermische Ausdehnung senkrecht zu den Zylinderachsen auf. Die Überstruktur schmilzt nur bei gleichzeitiger Quellung und Erwärmung der Probe. Die Ergebnisse werden mittels des von Frenkel vorgeschlagenen Struktonmodells diskutiert.
    Notes: Formation and melting of superlattices in homodisperse styrene - butadiene block copolymers are investigated by small angle neutron scattering. The superlattice of the investigated copolymers is formed by hexagonally packed polystyrene cylinders. In accord with earlier predictions the superlattice does not expand thermally in the direction transverse to that of the cylinder axes. Melting of the superstructure can be observed only on combination of swelling with thermal treatment. The results are readily interpreted in terms of the struction model advanced by Frenkel. Some general features of the structon model are discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 455-459 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The temperature dependence of the photoelastic coefficient ∊ of ternary copolymers of styrene and butadiene at different ratios of the components has been investigated. A strong influence of the optical form effect on the ∊(T) relationship was found. The disturbance of regularity of the supercrystalline lattice is shown to occur at temperatures considerably above the highest glass temperature of the components. This is interpreted as mechanical melting of the superlattice.
    Notes: Die Temperaturabhängigkeit des photoelastischen Koeffizienten ∊ von ternären Blockcopolymeren aus Styren und Butadien mit verschiedenen Komponentenverhältnissen wird untersucht. Hierbei wird ein starker Einfluß des optischen Formeffektes auf die Abhängigkeit ∊(T) nachgewiesen. Es wird gezeigt, daß die Störung der Regularität des Superkristallgitters des Blockcopolymers bei Temperaturen erfolgt, die erheblich oberhalb der höchsten Glastemperatur der Komponenten liegen. Dieser Prozeß wird als mechanisches „Schmelzen“ des Supergitters betrachtet.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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