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• W4211239428 startingPage "1" @default.
• W4211239428 abstract "Abstract Dynamic mechanical analysis (DMA) is the technique of applying a stress or strain to a sample at controlled frequencies and analyzing the response to obtain phase angle and deformation data. This data allows the calculation of the damping or tan delta (δ) as well as complex modulus and viscosity data. Two approaches are used: (i) forced frequency, where the signal is applied at a set frequency and (ii) free resonance, where the material is perturbed and allowed to exhibit free resonance decay. Most DMAs are of the former type, while the torsional braid analyzer (TBA) is of the latter type. In both the approaches, the technical is very sensitive to the motions of the polymer chains, and it is a powerful tool for measuring transitions in polymers. More specialized techniques such as the use of ultrasonics and laser pulses do exist in specialized markets. It is estimated to be 100 times more sensitive to the glass transition than differential scanning calorimetry (DSC), and it resolves other more localized transitions such as side chain movements that are not detected in the DSC. In addition, the technique allows the rapid scanning of a material's modulus and viscosity as a function of temperature, strain, or frequency. DMA may also be referred to as dynamic mechanical thermal analysis (DMTA), dynamic mechanical spectroscopy (DMS), or dynamic thermomechanical analysis (DTMA)." @default.
• W4211239428 created "2022-02-13" @default.
• W4211239428 creator A5001637106 @default.
• W4211239428 creator A5015070983 @default.
• W4211239428 date "2017-09-15" @default.
• W4211239428 modified "2023-10-16" @default.
• W4211239428 title "Dynamic Mechanical Analysis" @default.
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