Strength, 23 electromagnetically heated

Polymers based on trimellitic anhydride are widely used in premium electromagnetic wire enamels requiring high temperature performance. Several types of trimellitic anhydride-derived polymers are used as wire enamels poly(amide—imide)s (133), poly(ester—imide)s (134), and poly(amide—imide— ester)s (135). Excellent performance characteristics are imparted by trimellitic anhydride-based polymers for wire enamel requirements of flexibiUty, snap, burnout, scrap resistance, heat shock, and dielectric strength. 

The field strength and the frequency are dependent on the equipment, while the dielectric constant, dissipation factor, and loss factor are material-dependent. The electric field strength is also dependent on the location of the material within the microwave/radio-frequency cavity (Turner and Ferguson, 1995), which is one reason why domestic microwave ovens have rotating turntables (so that the food is exposed to a range of microwave intensities). This mechanism is the major one for the generation of heat within materials by these electromagnetic fields. 

The way that the metals are bonded and what metals are present can cause the materials to have a wide variety of properties. Metals are known for their strength, which is why they re used in heavy machinery. But they can also be malleable and thus can be made in to certain shapes without damaging the crystal or making the structure weaker. They re also ductile in the way they can be stretched, especially when they are heated. They are usually opaque and have some kind of color that we can see, but they can also reflect back and absorb other types of radiation and not just the electromagnetic radiation that we see in the visible spectrum. Some of the light that s not absorbed can be reflected, and this is what gives them a nice luster. 

The power P absorbed in a unit volume of a dielectric material and dissipated as heat depends on dielectric properties of the material (mainly the loss factor e") and the electromagnetic field parameters, i.e., the frequency / and the electric field strength E within the drying material... 

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