By Kevin P. Menard
Dynamic mechanical research (DMA) has left the area of the rheologist and has develop into a normal device within the analytical laboratory. in spite of the fact that, info at the use of this significant software remains to be scattered between various books and articles. newcomers within the box need to dig via thermal research, rheology, and fabrics texts simply to locate the fundamentals.
Updated with new fabric, accelerated sensible motives, and new purposes, Dynamic Mechanical research, moment variation maintains to offer chemists, engineers, and fabrics scientists a kick off point for utilising DMA to their person fields. It imparts a transparent realizing of the way DMA works, its benefits, and attainable boundaries. extra issues contain stress/strain, information dealing with, experimental expertise, try tools, and information research.
One of the one references devoted to DMA, this available and easy-to-read consultant gathers the main pertinent info on hand in this very important technique.
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Additional info for Dynamic mechanical analysis : a practical introduction
The curvature can be viewed as a function of the dashpot, where the material slips irrecoverably. As the amount of curvature increases, the increased curvature indicates the amount of liquid-like character in the material has increased. 17, is currently used to model a stress–strain curve. Better approaches exist. However, the introduction of curvature to the stress–strain curve comes from the viscoelastic nature of real polymers. 24 Molecular weight and molecular weight distribution have, as expected, significant effects on the stress–strain curve.
3 summarizes the main ways of applying a static stress. 3 Applications of a static stress to a sample. The three most common cases are shown plotted against time or temperature. (a) Shows a stress-strain curve where stress is plotted against strain; (b) shows a creep recovery curve with the stepwise application of a stress; and (c) shows a TMA run where a constant stress is applied while temperature is varied. 3a, we can track the change in strain as a function of stress. This is done at constant temperature and generates the stress–strain curve.
A) A PerkinElmer DMA 8000 with its integrated humidity generator, used with permission of PerkinElmer LAS, Shelton, Connecticut. (b) The effect on a sample of nylon of changing the humidity level while holding the temperature constant. Used with the permission of Triton Technologies, Keyworth, UK. Notes 1. C. Macosko, Rheology Principles, Measurements, and Applications, VCH, New York, 1994. 2. J. H. Poyntang, Proc. Royal Society, Series A, 82, 546, 1909. 3. A. Kimball and D. Lovell, Trans. Amer.