By Thomas E. Munns, James C. Seferis (auth.), Julian F. Johnson, Philip S. Gill (eds.)
This quantity five in a continuous sequence represents the compilation of papers offered on the overseas Symposium on Analytical Calorimetry as a part of the 185th nationwide assembly of the yank Chemical Society, Seattle, Washington, March 20-25th. 1983. a wider number of issues are coated than in pre vious volumes, because of the progress within the box of Thermal research. particular subject matters protecting such recommendations as differential scanning calorimetry, mixed thermogravimetric techniques, dynamic mechan ical research and a number of novel kinetic analyses are coated. quite a lot of fabric forms are incorporated during this quantity corresponding to polymers (alloys, blends and composites), fossil fuels, organic items, liquid crystals and inorganic fabrics. The co-editors of this quantity wish to thank all of the members for his or her efforts in conforming to the manuscript necessities, and for being advised within the training. we might additionally wish to thank those that presided over periods throughout the process the symposium; Professor Anselm C. Griffin, Professor Roger S. Porter and Dr. Edith A. Turi.
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Extra info for Analytical Calorimetry: Volume 5
Cook* General Technology Division IBM Corporation Endicott, NY 13760 *Present address: Baker Laboratory Department of Chemical Engineering Cornell University Ithaca, NY 14850 ABSTRACT The curing reaction of a DICY-based epoxy resin was characterized by DSC. The epoxy resin was composed of a mixture of brominated bisphenol-A diglycidyl ether and of epoxidized cresol novolak with dicyandiamide (DICY) as hardener and tetramethyl butane diamine (TMBDA) as catalyst. The optimum ratio of epoxy/ DICY in terms of the glass transitic:l temperature (Tg) was determined to be about 8:1.
As a sample is cooled from slightly above the Curie temperature, there is a quite clear discontinuity between the first very slow movement--presumably due to paramagnetism--and the substantially more rapid movement as the sample is pulled to the stop. The extrapolation of these segments (Figure 4) 39 CURIE TEMPERATURES STRAIN GAUGE OUTPUT TI ME (AND TEMPERAT URE) Figure 4. The sample position as a function of time as the sample is heated and cooled through the Curie point. is clear and reproducible.
Ill i li l ll :;:- . , iii' 'lIll i ll l: 1 1--- - ! ~':_ - (b) The sample position as a function of time as the sample is heated slowly toward the Curie point. by conduction from the winding and from the magnet. At some temperature below the Curie temperature, the attraction is less than the force exerted by the spring and the sample pulls away--not slowly, because the magnetic force drops off with the second power of the distance. As soon as the gap is increased, two effects begin--adiabatic demagnetization and convective cooling.
Analytical Calorimetry: Volume 5 by Thomas E. Munns, James C. Seferis (auth.), Julian F. Johnson, Philip S. Gill (eds.)