TPC: Thermoplastic Copolyester Elastomer

General Properties

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TPC

Thermoplastic Copolyester Elastomer


Thermoplastic copolyester elastomers are sometimes also referred to as thermoplastic polyester elastomers (TPE-E), thermo- plastic copolyesters (TPC) or copolyester elastomers (COPE). They are block copolymers of alternating hard and soft segments with backbones consisting of ether and/or ester groups – in accordance with ISO 18064*.

*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.

Structural Formula


Properties

Glass Transition Temperature0 to 60°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Temperature190 to 230°C
Melting Temperatures and EnthalpiesThe enthalpy of fusion of a substance, also known as latent heat, is a measure of the energy input, typically heat, which is necessary to convert a substance from solid to liquid state. The melting point of a substance is the temperature at which it changes state from solid (crystalline) to liquid (isotropic melt).Melting Enthalpy-
Decomposition Temperature395 to 420°C
Young's Modulus50 to 1000 MPa
Coefficient of Linear Thermal Expansion165 to 200 *10-6/K
Specific Heat Capacity1.90 to 2.22 J/(g*K)
Thermal Conductivity0.10 to 0.19 W/(m*K)
Density1.0 to 1.2 g/cm³
MorphologyThermoplastic elastomer, block copolymer with hard and soft segments
General propertiesGood resistance to fuels and lubricating greases. Good hydrolysis resistance. Good abrasion resistance
ProcessingInjection molding, extrusion, blow molding
ApplicationsAutomotive industry. Technical rubber articles (belts, pulleys, O-rings, band conveyors). Electrical sector (e.g., cable sheathings, plug-in connectors). Shoe soles (soccer shoes)

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass12.13 mg
Isothermal Phase8 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)

Evaluation

In the 2nd heating (red), the polymer first shows 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 at 17°C (midpoint, Δcp 0.17 J/(g*K)) and finally an endothermal melting effect (peak temperature 219°C, heat of fusion 38 J/g), directly preceded by an EsotermicoUna transizione o reazione è esotermica se il materiale genera calore exothermal Post Crystallization (Cold Crystallization)The post crystallization of semi-crystalline plastics occurs primarily at elevated temperatures and increased molecular mobility above the glass transition.post crystallization (at 203°C with an enthalpy of 0.4 J/g). The peak temperature of the melting effect with 219°C in the 2nd heating is approx. 2 K lower than in the 1st heating (blue), due to the better contact between the sample and crucible bottom after the first melting. The endothermal peak at 221°C in the 1st heating (blue) is also preceded by an although small Post Crystallization (Cold Crystallization)The post crystallization of semi-crystalline plastics occurs primarily at elevated temperatures and increased molecular mobility above the glass transition.post-crystallization at 192°C (see enlargement). The glass transition at 17°C (midpoint) is in good correlation with the behavior in the 2nd heating. Additionally, an endothermal effect at 73°C can be observed in the 1st heating (blue) that can be attributed to the melting of an additive, which is better distributed in the matrix after the first melting.