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  • 1980-1984  (2)
  • 1981  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 21 (1981), S. 299-307 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a déterminé, pour cinq adhésifs époxy de composition inconnue, les températures de transition vitreuseT g et les effets thermiques de polymérisationΔH. A partir de la variation deΔH en fonction du temps de recuit et par une méthode de calcul itératif, un ordre cinétique phénoménologique de la vitesse de polymérisation à 100° a pu être obtenu. Pour la plupart des adhésifs étudiés l'existence d'un pic double de polymérisation et d'une double transition vitreuseT g permet de supposer qu'il s'agit de copolymères greffés.
    Abstract: Zusammenfassung Die Glas-Übergangstemperaturen (T g) und dieΔH thermische Effekte der Polymerisation wurden für fünf Epoxy-Klebstoffe unbekannter Zusammensetzung bestimmt. Aus den TrendsΔH gegenübert cure war es möglich eine phenomenologische kinetische Ordnung der Polymerisationsgeschwindigkeit bei 100° durch ein iteratives Berechnungsverfahren zu ermitteln. Für die meisten untersuchten Klebstoffe besteht der Grund — Doppelpeak der Polymerisation und doppeltesT g-Signal — sie als Pfropfcopolymere zu betrachten.
    Notes: Abstract The glass transition temperatures,T g, and thermal effects of polymerization,ΔH, have been determined for five epoxy adhesives of unknown composition. From the trendsΔH vs./t cure it has been possible to attain a phenomenological kinetic order of the polymerization rate at 100° through an iterative calculation procedure. For most of the investigated adhesives there are reasons (double peak of polymerization and doubleT g signal) to assume that they are graft copolymers.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-2592
    Keywords: Severe combined immunodeficiency ; T-cell subpopulations ; T helper-cell subpopulations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The case of an infant female aged 1 month with severe infections, failure to thrive, and skin erythroderma is reported. Immunological studies demonstrated a severe combined immunodeficiency (SCID) with B cells and normal serum IgM levels. Studies of T-cell subpopulations showed a defect of a subset of T helper cells. Possible pathogenetic mechanisms are discussed.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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