TA Instruments’ Q800 DMA, based on a combined motor and transducer design, uses advanced, non-contact, linear motors to control stress and measure strain with a highly sensitive optical encoder. Dynamic Mechanical Analysis (DMA) is a technique used to measure the mechanical properties of a wide range of materials. DMA works primarily in the viscoelastic range of a material and is therefore more sensitive to structure than a typical tensile test. With its unique design, the Q800 is also ideal for high-stiffness applications including composites. DMA measures the viscoelastic properties using either transient tests (creep or stress relaxation) or dynamic oscillatory tests, where a sinusoidal stress (or strain) is applied to the material and a resultant sinusoidal strain (or stress) is measured. Also measured is the phase difference of these two sinusoidal waves. The stress/strain and phase difference allow for the calculation of storage modulus, loss modulus, and Tan δ. All of these parameters can be calculated as a function of time, temperature, frequency, or amplitude (stress or strain) depending on the application. (TA Instruments Q800 product brochure) Property Determination § Crosslink density § Glass transition temperature (Tg) § Stress relaxation § Toughness Features § Wide temperature range, gas cooling accessory, -140ºC to 600ºC § Available clamps: dual-cantilever, 50 mm 3-point bend, and film/fiber tension § Testing modes: multi-frequency from 0.01–200 Hz, multi stress/strain, creep/stress relaxation, controlled force/strain rate, and isostrain § Material performance prediction with Time/Temperature Superpositioning, TTS

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Acquisition Date: 
November 1, 2004