Quantitative DTA of epoxy adhesives of technological interest |
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Authors: | A Schiraldi V Wagner G Samanni P Rossi |
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Institution: | (1) Centro di Studio per la Termodinamica ed Elettrochimica dei sistemi salini fusi e solidi del CNR, c/o Istituto di Chimica Fisica e di Elettrochimica dell' Università di Pavia, Costruzioni Aeronautiche Giovanni Agusta, Gallarate, Italy |
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Abstract: | The glass transition temperatures,T
g, and thermal effects of polymerization, H, have been determined for five epoxy adhesives of unknown composition. From the trends H 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.
Zusammenfassung Die Glas-Übergangstemperaturen (T
g) und die H thermische Effekte der Polymerisation wurden für fünf Epoxy-Klebstoffe unbekannter Zusammensetzung bestimmt.Aus den Trends H 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.
Résumé On a déterminé, pour cinq adhésifs époxy de composition inconnue, les températures de transition vitreuseT
g et les effets thermiques de polymérisation H.A partir de la variation de H 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.
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g ![rcy](/content/v6t600605p216211/xxlarge1088.gif) ![icy](/content/v6t600605p216211/xxlarge1080.gif) ![vcy](/content/v6t600605p216211/xxlarge1074.gif) ![iecy](/content/v6t600605p216211/xxlarge1077.gif) ![lcy](/content/v6t600605p216211/xxlarge1083.gif) ![vcy](/content/v6t600605p216211/xxlarge1074.gif) ![ycy](/content/v6t600605p216211/xxlarge1099.gif) ![vcy](/content/v6t600605p216211/xxlarge1074.gif) ![ocy](/content/v6t600605p216211/xxlarge1086.gif) ![dcy](/content/v6t600605p216211/xxlarge1076.gif) , ![chcy](/content/v6t600605p216211/xxlarge1095.gif) ![tcy](/content/v6t600605p216211/xxlarge1090.gif) ![ecy](/content/v6t600605p216211/xxlarge1101.gif) ![kcy](/content/v6t600605p216211/xxlarge1082.gif) ![lcy](/content/v6t600605p216211/xxlarge1083.gif) ![iecy](/content/v6t600605p216211/xxlarge1077.gif) ![dcy](/content/v6t600605p216211/xxlarge1076.gif) ![ocy](/content/v6t600605p216211/xxlarge1086.gif) ![lcy](/content/v6t600605p216211/xxlarge1083.gif) ![zhcy](/content/v6t600605p216211/xxlarge1078.gif) ![ncy](/content/v6t600605p216211/xxlarge1085.gif) ![bcy](/content/v6t600605p216211/xxlarge1073.gif) ![ycy](/content/v6t600605p216211/xxlarge1099.gif) ![tcy](/content/v6t600605p216211/xxlarge1090.gif) ![gcy](/content/v6t600605p216211/xxlarge1075.gif) ![rcy](/content/v6t600605p216211/xxlarge1088.gif) ![acy](/content/v6t600605p216211/xxlarge1072.gif) ![fcy](/content/v6t600605p216211/xxlarge1092.gif) -![kcy](/content/v6t600605p216211/xxlarge1082.gif) ![ocy](/content/v6t600605p216211/xxlarge1086.gif) ![ocy](/content/v6t600605p216211/xxlarge1086.gif) ![lcy](/content/v6t600605p216211/xxlarge1083.gif) ![icy](/content/v6t600605p216211/xxlarge1080.gif) ![mcy](/content/v6t600605p216211/xxlarge1084.gif) ![iecy](/content/v6t600605p216211/xxlarge1077.gif) ![rcy](/content/v6t600605p216211/xxlarge1088.gif) ![acy](/content/v6t600605p216211/xxlarge1072.gif) ![mcy](/content/v6t600605p216211/xxlarge1084.gif) .
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