Dynamic mechanical analysis

（重定向自DMTA）

Figure 1. A typical DMA tester with grips to hold sample and environmental chamber to provide different temperature conditions. A sample is mounted on the grips and the environmental chamber can slide over to enclose the sample.

Figure 2. A temperature sweep test on Polycarbonate. Storage Modulus (E’) and Loss Modulus (E’’) against temperature were plotted. Different initial static load and strain were used. The glass transition temperature of Polycarbonate was detected to be around 150 degree C.The Polycarbonate samples were made from the material purchased from Mcmaster-Carr, #8574k26

Figure 3. General schematic of a DMA instrument.

Figure 4. Torsional versus Axial Motions.

Dynamic mechanical analysis (abbreviated DMA, also known as dynamic mechanical spectroscopy) 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 one to determine the complex modulus. The temperature of the sample or the frequency of the stress are often varied, leading to variations in the complex modulus; this approach can be used to locate the glass transition temperature of the material, as well as to identify transitions corresponding to other molecular motions.

单词	DMTA
释义	DMTA 英语例句库 The effect of ethylene comonomer content on the crystallization, mechanical and viscoelastic properties of VERSIFY copolymers was studied by DSC, DMTA, POM and WAXD. 通过DSC，DMTA，POM和WAXD等手段，研究了乙烯共聚单体含量的变化对VERSIFY共聚物结晶性能、力学性能和粘弹性能的影响。英语百科 Dynamic mechanical analysis （重定向自DMTA） Dynamic mechanical analysis (abbreviated DMA, also known as dynamic mechanical spectroscopy) 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 one to determine the complex modulus. The temperature of the sample or the frequency of the stress are often varied, leading to variations in the complex modulus; this approach can be used to locate the glass transition temperature of the material, as well as to identify transitions corresponding to other molecular motions.
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