PVC-U: Polyvinyl Chloride (Unplasticized)

General Properties

Short Name:

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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 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 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 reactionA decomposition reaction is a thermally induced reaction of a chemical compound forming solid and/or gaseous products. Decomposition Temperature285 to 315 / 460 to 475°C
Young's Modulus2700 to 3000 MPa
Coefficient of Linear Thermal Expansion (CLTE/CTE)The coefficient of linear thermal expansion (CLTE) describes the length change of a material as a function of the temperature.Coefficient of Linear Thermal Expansion60 to 80 *10-6/K
Specific Heat Capacity0.84 to 1.171.3 J/(g*K)
Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.Thermal Conductivity0.13 to 0.29 W/(m*K)
DensityThe mass density is defined as the ratio between mass and volume. 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
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phases5 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)

Evaluation

Due to the missing plasticizer, the 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 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 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 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.