Thermoplastic Elastomer on a Polyolefin Basis
In accordance with ISO 18064*, TPVs are thermoplastic rubber vulcanizates that consist of a thermoplastic polymer such as PP and a rubber, e.g., EPDM, the curing of which occurs during blending and mixing. The rubber content is usually at approx. 60 to 80 weight%.
*DIN EN ISO 18064, Thermoplastic elastomers – Nomenclature and abbreviated items.
Due to the diversity of existing structures of this thermoplastic elastomer no specific chemical structure is given.
|DSC 204 F1 Phoenix®
|8 min / 3 min / 8 min
|Al, pierced lid
|N2 (40 ml/min)
Due to their composition, TPVs exhibit both a Temperatura di transizione vetrosaLa transizione vetrosa è una delle più importanti proprietà chimico-fisiche dei materiali amorfi e semi-cristallini, come, ad esempio, vetri, metalli (amorfi), polimeri, ingredienti farmaceutici e alimentari e definisce l’intervallo di temperatura in cui le proprietà meccaniche die materiali variano da duro e fragile a più morbido, malleabile o gommoso.glass transition, from their elastomer component, and a melting transition, from their thermoplastic component. In this example, the 2nd heating (red) shows a glass transition at -59°C (midpoint) that is immediately followed by an endothermal eff ect with a peak temperature of -15°C and an enthalpy of less than 10 J/g. Both can be related to the soft and hard segments of a rubber, probably EPDM. A larger endothermal effect with a peak temperature of 154 °C (heat of fusion 16 J/g) is due to the melting of the olefin component and is characteristic of polypropylene. The DSC curves from the two heatings are nearly identical.