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In situ real-time study of crosslinking kinetics in thermal and microwave fields

✍ Scribed by Jovan Mijović; William V. Corso; Luigi Nicolais; Guglielmo d'Ambrosio

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
547 KB
Volume
9
Category
Article
ISSN
1042-7147

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✦ Synopsis

A comparative investigation has been conducted of the mechanisms and rate of chemical reactions in thermal and microwave fields. A number of nonpolymer-forming and polymer-forming mixtures of different functionality and molecular architecture were prepared and investigated. The advancement of reactions in thermal and microwave fields was monitored in real time by in situ remote near-infrared spectroscopy. The principal finding was that the use of microwaves in lieu of thermal heating had no effect on the mechanism or kinetics during the isothermal cure of various epoxies, polyimides and bismaleimides. No ªmicrowave effectº was observed and it was concluded that the claims of ªaccelerated kineticsº in the microwave field are unfounded. However, a comparison between thermal and microwave cure assumes a whole new dimension when the temperature distribution inside the sample is considered, and that constitutes a scientifically challenging area that warrants further research.

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