By J.P. Critchley, G.J. Knight, W.W. Wright
Definitions of what's intended by means of a heat-resistant polymer range significantly. now we have taken the time period to intend a polymer which might be used, at the least for brief time sessions, at temperatures from 150°C. the best challenge which arises in writing a monograph on such fabrics is the large quantity of information that's to be had. greater than 2000 references were released on one heat-resistant polymer approach on my own over a interval of little greater than years. the result's very excessive measure of selectivity needs to be exercised with recognize to the knowledge reproduced. now we have selected to limit our assurance to polymers that experience acquired no less than a point of industrial exploitation and to information in their equipment of coaching, their thermal and thermo-oxidative stabilities and modes of deterioration, and their houses at increased temperatures. It has to be emphasised that different homes no longer stated, e. g. , hydrolytic and chemical balance, and resistance to ultraviolet radiation, might be both vital particularly makes use of of those fabrics. The "older" heat-resistant polymers, e. g. , the thermosets and a few of the fluorine-containing fabrics, should not handled in such intensity as are the "newer" polymers with fragrant and/or heterocyclic jewelry within the chain. the reason is, books were on hand for your time at the well-established advertisement polymers and advancements in them haven't been as marked re cently as within the fragrant and heterocyclic macromolecules.
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Weight loss Effect of activation energy on thermogravimetry curves. Reference 18. different heating rates, or experiments in which the temperature is ''cycled'' or "jumped" during a run, should be used. 18 This, of course, immediately removes some of the advantages that thermogravimetry has over isothermal masschange measurements. It is our belief that the latter is much more appropriate for the detailed study of the kinetics of degradation of polymers. 11). A rate of weight loss is deliberately emphasized, as the rate more often than not varies during the course of an experiment, and the question then arises as to precisely which rate to use in the plot.
Heating rate 5°Cimin) Reference 33. "' 40 3; 60 Maleic anhydflde Boron trifluorid~ comple-x -- --- 80 Figure 2. 15. Thermogravimetry in air of an epoxy resin based upon the tetraglycidyl ether of tetraphenylethane cured with different agents. min) Reference 34. Thermal Stability As stated earlier, the properties of epoxy resins are very much governed by the curing agent used. 14, which shows weight loss curves for a bisphenol-A epoxy resin cured with three different compounds. 33 There is a difference of over 100°C in the initial temperatures for breakdown.
At higher temperatures, breakdown of methylene bridges and the triazine rings themselves commences. Elevated Temperature Properties The only data available relate to the behavior of glass fiber/melamine resin laminates and are fairly old (30 years). 27 •28 There is no reason to expect, however, that properties have greatly improved during this time interval. 2 gives flexural and compressive strength values of laminates at various elevated temperatures after different times of aging at temperature, and Figure 2.