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Frequency Dependence of Glass Transition Temperatures for Fiberglass-Reinforced Polymers and Acrylonitrile Butadiene Styrene

Using an Anton Paar Dynamic Mechanical Analyzer (DMA) for characterizing thermal properties of fiberglass-reinforced composites (FRP) and acrylonitrile butadiene styrene (ABS).

Dynamic mechanical analysis (DMA) represents a basic analytical tool for investigation of thermo-mechanical behavior of thermoplastics, thermosets and thermoset-based composite materials. DMA is one of the most sensitive techniques of thermal analysis. The glass transition temperature (Tg) of highly cross-linked thermosets like epoxy is, in many cases, only measureable by DMA, because methods such as differential scanning calorimetry (DSC) or thermomechanical analysis (TMA) may not be sensitive enough.

This application report shows how the glass transition temperature Tg and its frequency dependence can be measured. This is demonstrated for a fiberglass-reinforced polymer (FRP) and acrylonitrile butadiene styrene (ABS).

Polymers have a strong tendency to glass formation, while retaining a disordered structure. Glass formation is responsible for the characteristic properties of polymers. Above the Tg, polymer chains are mobile. Therefore, the Tg of a polymer is often associated with its mechanical properties.

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