PIB: Polyisobutylene

General Properties

Short Name:

Name: 

PIB

Polyisobutylene(C8H8)n1 (C4H6)n2 (C3H3N)n3


Polyisobutylene (PIB) is the oldest, commercial olefin polimerizate and was launched in the 1930’s. Depending on the degree of polymerization and molar mass, PIB can have a viscous, plastically sticky or rubberlike consistency.

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-70 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 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 Temperature390 to 400°C
Young's Modulus-
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 Expansion120 *10-6/K
Specific Heat Capacity1.97 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 Conductivity0.12 to 0.20 W/(m*K)
DensityThe mass density is defined as the ratio between mass and volume. Density0.91 to 0.93 g/cm³
MorphologyAmorphous thermoplastic
General propertiesHigh elongation at break, good electrical insulating properties, resistant to acids, bases and salts.
ProcessingExtrusion, calendering.
ApplicationsBuilding industry, sealing compounds, component of coatings, adhesive, basic material for chewing gum, plastification of explosives.

NETZSCH Measurement

InstrumentDSC 204 F1 Phoenix®
Sample Mass15.17 mg
IsothermalTests at controlled and constant temperature are called isothermal.Isothermal Phases20 min/2 min/20 min
Heating/Colling Rates10 K/min
CrucibleAl, pierced lid
AtmosphereN2 (40 ml/min)

Evaluation

PIB is an amorphous thermoplastic, as reflected in the DSC curves. In both heatings, 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 -64°C (midpoint) was observed exclusively. The step heights (Δcp) are identical in both curves and have a value of 0.39 J/(g·K) in both the 1st heating (blue) and 2nd heating (red).