Journal ArticleDOI
Isothermal transitions of a thermosetting system
TLDR
In this paper, a study of the curing reactions of a cycloaliphatic epoxy resin/anhydride system by torsional braid analysis showed the existence of two critical isothermal temperatures - namely, the maximum glass transition temperature of the thermoset system and the glass transition ratio of the material at its gel point.Abstract:
A study of the curing reactions of a cycloaliphatic epoxy resin/anhydride system by torsional braid analysis showed the existence of two critical isothermal temperatures - namely, the maximum glass transition temperature of the thermoset system and the glass transition temperature of the material at its gel point. Two rheologically active kinetic transitions occur during isothermal cure which correspond to gelation and vitrification. Three types of isothermal behavior occur. Methods for determining the time to gel and the time to vitrify, and also the two above-mentioned critical isothermal temperatures, have been developed. The time to gel obeyed the Arrhenius relationship, whereas the time to vitrify passed through a minimum. Application of these results to thermosetting systems in general is discussed in terms of the influence of molecular structure on the values of the critical isothermal temperatures.read more
Citations
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Journal ArticleDOI
Formation and properties of thermosetting and high Tg polymeric materials
TL;DR: In this article, the relationship between reaction conditions and material properties of high Tg polymers is discussed from the point of view of a generalized time-temperature transformation (TTT) diagram.
Journal ArticleDOI
Cellulose nanofiber network for moisture stable, strong and ductile biocomposites and increased epoxy curing rate
TL;DR: In this paper, a nanocomposites with high volume fractions (15-50 vol%) of nanofibrillated cellulose (NFC) were prepared by impregnation of a wet porous NFC network with acetone/epoxy/amine solution.
Journal ArticleDOI
Thermal scanning rheometer analysis of curing kinetic of an epoxy resin: 2. An amine as curing agent
TL;DR: In this article, the effect of amine concentration on the kinetic, the rheologic characteristics during the crosslinking process, and the dynamic-mechanical properties of the system was studied by means of thermal scanning rheometer (TSR) and dynamic mechanical thermal analyser (DMTA).
Journal ArticleDOI
The Durability of Epoxies.
Roger J. Morgan,James E. O'neal +1 more
TL;DR: In this paper, the state of knowledge of the basic factors that control the durability of epoxies in service environments is reviewed, and the effect of fabrication and environmental factors and their complex interactions on the formation of permanent damage regions are discussed.
Journal ArticleDOI
Preparation, curing kinetics, and properties of a novel low-volatile starlike aliphatic-polyamine curing agent for epoxy resins
TL;DR: In this paper, a low-volatile starlike aliphatic polyamine with extraordinarily high NH 2 functionalities, N,N,N′, N′,N-N′-penta(3-aminopropyl)-diethylenetriamine (PADT), is synthesized and its molecular structure is confirmed by the FTIR, 1 H NMR and ESI-MS analysis.
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