Dynamic Mechanical Analysis of Polymers
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چکیده
1 TA236 (Figure 2) is based on a patent pending design that optimizes the combination of these critical components. Specifically, the analyzer incorporates a noncontact direct drive motor to deliver reproducible forces (stresses) over a wide dynamic range of 0.001–18 N; an air bearing shaft support and guidance system to provide frictionless continuous travel over 25 mm for evaluating large samples (e.g., fibers as long as 30 mm) or for evaluating polymers at large oscillation amplitudes (±0.5–10,000 μm); an optical encoder displacement sensor to provide high resolution (one part in 25 million) of oscillation amplitude, which results in excellent modulus precision (±1%) and tan δ sensitivity (0.0001); and a bifilar-wound furnace complemented by a gas cooling accessory to allow a broad temperature range (–150 to 600°C) to be covered. The DMA 2980 also features a variety of clamping configurations to accommodate rigid bars, fibers, thin films, and viscous liquids (e.g., thermosets) in bending, compression, shear, and tension modes of deformation.
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