PVC-U: Polyvinyl Chloride (Unplasticized)

General Properties

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PVC-U

Polyvinyl Chloride (Unplasticized)


PVC-U, sometimes also designated rigid PVC, is polyvinyl chloride without the addition of plasticizer. The letter U stands for unplasticized. As with PVC-P, thermoplastic processing of PVC-U should take place on special corrosion-resistant systems and take the decom- position temperature of PVC (HCl formation) into account. For the compounding or extrusion of PVC powder, counter-rotating twin screw extruders are used to keep the mechanical StressStress is defined as a level of force applied on a sample with a well-defined cross section. (Stress = force/area). Samples having a circular or rectangular cross section can be compressed or stretched. Elastic materials like rubber can be stretched up to 5 to 10 times their original length.stress of the shear-sensitive polymer to a minimum. In the same way as for PVC-P, the degree of gelation serves as a quality criterion for PVC-U that is directly linked to the impact strength.

Structural Formula


Properties

Glass Transition Temperature80 to 90°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 Temperature-
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 Temperature285 to 315 / 460 to 475°C
Young's Modulus2700 to 3000 MPa
Coefficient of Linear Thermal Expansion60 to 80 *10-6/K
Specific Heat Capacity0.84 to 1.171.3 J/(g*K)
Thermal Conductivity0.13 to 0.29 W/(m*K)
Density1.38 to 1.55 g/cm³
MorphologyAmorphous thermoplastic
General propertiesHigh mechanical stability, stiffness and hardness, good chemical resistance, good electrical and insulating properties, low tendency to StressStress is defined as a level of force applied on a sample with a well-defined cross section. (Stress = force/area). Samples having a circular or rectangular cross section can be compressed or stretched. Elastic materials like rubber can be stretched up to 5 to 10 times their original length.stress cracking, good weatherability, low humidity absorption
ProcessingExtrusion, inject moulding, blow moulding, calendering, chip removing process
ApplicationsBuilding industry (e.g. window profiles (with stabilizers), pipes), mechanical and apparatus engineering, electrical engineering, packaging industry

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass10.82 mg
Isothermal Phases5 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)

Evaluation

Due to the missing plasticizer, the 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 of the entirely amorphous plastic PVC-U occurred at much higher temperatures, compared to PVC-P; in the present case at approx. 84°C (in both heatings, midpoint) with a step height (Δcp) of 0.32 J/(g·K) in the 2nd heating. The slight waves, overlapping the 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 step in the 1st heating, are probably due to StressStress is defined as a level of force applied on a sample with a well-defined cross section. (Stress = force/area). Samples having a circular or rectangular cross section can be compressed or stretched. Elastic materials like rubber can be stretched up to 5 to 10 times their original length.stress in the material that is dissipated during thermal treatment.