PVF: Polyvinylfluoride

General Properties

Short Name:

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PVF

Polyvinylfluoride

Polyvinyl fluoride (PVF), just like PTFE, belongs to the semi-crystalline thermoplastic fluoroplastics. In structure, it is related to PVC, but polyvinyl fluoride features a higher chemical and physical stability than polyvinyl chloride since the bonding between fluorine and carbon is stronger than between chlorine and carbon.

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 Temperature	-20 to +40°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	190 to 200°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	164 J/g
Decomposition reactionA decomposition reaction is a thermally induced reaction of a chemical compound forming solid and/or gaseous products. Decomposition Temperature	430 to 450°C
Young's Modulus	2100 to 2600 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 Expansion	50 to 97 *10^-6/K
Specific Heat Capacity	1.0 to 1.8 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 Conductivity	-
DensityThe mass density is defined as the ratio between mass and volume. Density	1.37 to 1.39 g/cm³
Morphology	Semi-crystalline polymer
General properties	Good weather resistance. Very good chemical resistance. Good stability and toughness
Processing	Extrusion
Applications	Building industry (e.g., weather-resistant films). Electrical engineering. Automotive industry. Aircraft construction

NETZSCH Measurement

Instrument	DSC 204 `F1` `Phoenix^®`
Sample Mass	8.79 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phase	5 min / 1 min / 5 min
Heating/Colling Rates	10 K/min
Crucible	Al, pierced lid
Atmosphere	N₂ (40 ml/min)

Evaluation

PVF is semi-crystalline and shows, 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 approx. 39°C in the 2^nd heating (red, midpoint), a melting transition with a peak temperature of 195°C (2^nd heating). The melting enthalpy of approx. 56 J/g was similar in the two heatings. 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 steps with 0.07 J/(g*K) (1^st heating, blue) and 0.09 J/(g*K) (2^nd heating, red) are very small.