Thermoplastic Urethane Elastomer
Urethane-based thermoplastic elastomers (TPUs) are generated by the polyaddition of polyisocyanate with polyols and so-called chain extenders (lower molecular diols). They are linear block copolymers containing hard and soft segments. In accordance with ISO 18064*, there is a segmentation of the TPU group corresponding to the nature of the hydrocarbon component (aromatic or aliphatic) between the urethane linkage of the hard blocks and corresponding to the chemical bonding (ether, ester, carbonate) within the soft blocks.
*DIN EN ISO 18064, Thermoplastic elastomers – Nomenclature and abbreviated terms.
Due to the diversity of existing structures of this thermoplastic elastomer no specifi c chemical structure is given.
|DSC 204 F1 Phoenix®
|IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase
|Al, pierced lid
|N2 (40 ml/min)
Presented in the above graphic is the 2nd heating of a TPU. Along with a 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 at -32°C (Δcp 0.42 J/(g.K)), reflecting the thermal behavior of the soft segments, the DSC curve displays a broad endothermal eff ect (peak temperature of the main effect 167°C, heat of fusion approx. 8 J/g) that can be attributed to the melting of hard segments.