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  • 1
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of crystallization and structure formation of polycaproamide (PCA) during anionic adiabatic polymerization of ε-caprolactam was studied. The adiabatic crystallization was shown to comprise three successive stages. In the first stage PCA forms dendritelike structures, the space between which is filled with the monomer. In the second stage rather rapid crystallization proceeds to give large loose spherulites. The dendritic structures serve as nuclei for development of spherulites. In the third stage slow secondary crystallization occurs. It is accomplished by crystallization of the residual amorphous substance located both in the dendritic nucleus and throughout the volume of the spherulites. This process is followed by the partial disappearance of the dendritic nuclei and by thickening of lamellae, which results in a substantial densification of initial structures and appearance of fine spherulites. As a result, a fine spherulitic structure with 50% crystallinity is formed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    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: Some regularities of anionic polymerization of ε-caprolactam in presence of new activators involving unsaturated groups (N-methacryloyl-ε-caprolactam and N.N.-diphenylacrylamide) have been studied. The mechanism of formation of polyfunctional activators during polymerization was proposed. The formation of polymers with irregular branched structure was established.Some physico-mechanical properties of polycaproamides obtained in the presence of these activators were investigated. It was established that the above mentioned polymers possessed better strength characteristics than the polymers obtained in the presence of monofunctional activators.
    Notes: Es wurden einige Gesetzmäßigkeiten der anionischen Polymerisation des ε-Caprolactams in Gegenwart von Aktivatoren neuen Typs (N-Methacryloyl-ε-caprolactam und N.N-Diphenylacrylamid) untersucht, die ungesättigte Gruppen enthalten. Ein Mechanismus der Bildung von polyfunktionellen Aktivatoren bei dieser Polymerisation wird vorgeschlagen. Es zeigte sich, daß dabei Polymere mit einer unregelmäßig verzweigten Struktur gebildet werden.Es wurden einige physikalisch-mechanische Eigenschaften der in Gegenwart der angegebenen Aktivatoren dargestellten Polycapronamide untersucht und gezeigt, daß die oben beschriebenen Polymeren bessere Festigkeits-Charakteristika aufweisen als die mit monofunktionellen Aktivatoren erhaltenen Polymeren.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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