Dynamic mechanical analysis (abbreviated DMA) is a technique used to study and characterize materials. It is most useful for studying the viscoelastic behavior of polymers. A sinusoidal stress is applied and the strain in the material is measured, allowing …

For testing the mechanical properties of a polymer nano-composite, dynamic mechanical thermal analysis (DMTA) can be used. DMTA can be performed in torsion with a rotational rheometer. The material is exposed to oscillatory shear while the temperature is changing continuously.

2015年9月15日 · Dynamic mechanical analysis (DMA) is the technique of applying a stress or strain to a sample and analyzing the response to obtain phase angle and deformation data. These data allow the calculation of the damping or tan delta (δ) …

Accelerated testing procedures based upon principles of time-temperature superpositioning proposed by Williams, Landel, and Ferry1 were devised to create “doubly-reduced” master curves of the observed mechanical response. The diffusion phenomenon was introduced via the creation of a diffusion-time shift factor.

The dynamic-mechanical analysis (DMA) or dynamic mechanical thermal analysis (DMTA) allows a comprehensive determination of mechanical properties of polymeric materials at different temperatures and frequencies.

2016年12月26日 · 测定材料在一定温度范围内动态力学性能的变化就是动态力学热分析（Dynamic Mechanical Thermal Analysis，简称DMTA）或动态力学分析（ Dynamic Mechanical Analysis，简称DMA）。 动态力学性能测量原理 (1)聚合物的粘弹行为 （a）弹性变形体系：

1991年2月28日 · One of the emerging application areas for DMTA is the generation of master curves. The William-Landel Ferry (WLF) equation usually forms the basis of the necessary shifts to produce a master curve.

The modulus vs frequency curves at various temperatures can be shifted horizontally and/or vertically depending on whether the material is thermo-rheologically simple. Experimental verification of part of a master curve provides additional confidence in the applicability of the TTS principles to a material. 107

Objective: Measure the dynamic mechanical loss and storage modulus as a function of frequency using time-temperature superposition (TTS) of dynamic mechanical analyzer (DMA) data at various temperatures from a rubbery sample (PDMS or butadiene rubber), a glassy sample (polycarbonate, polystyrene, polyethylene terephthalate (PET) or polymeth...

2021年3月10日 · Dynamic Mechanical Analysis or DMA for short, is an extremely versatile and flexible analytical technique for measuring the physical properties (incl: storage modulus, glass transition temperature, etc..) of a range of materials.