POLYMERS

PTFE — Visco-Elastic Properties

The combination of a 3-point bending sample holder and a modulated sample force allows the visco-elastic properties of a material to be determined.

A PTFE bar was measured between -150°C and 150°C under (rectangular) modulated force (fixed static force of 0.2 N and three different dynamic forces). Based on the expansion data and the sample geometry, the storage modulus E´ can be calculated as a function of temperature. The three typical PTFE transformations are clearly visible at around -100°C (ß-transition), between 0°C and 50°C (crystal to condis-crystal transformation) and above 100°C (Glass Transition TemperatureThe glass transition is one of the most important properties of amorphous and semi-crystalline materials, e.g., inorganic glasses, amorphous metals, polymers, pharmaceuticals and food ingredients, etc., and describes the temperature region where the mechanical properties of the materials change from hard and brittle to more soft, deformable or rubbery.glass transition). (measurement with TMA 402 F1 /F3 Hyperion®®®)

Meaningful Material Characterization in the High-Temperature Field