PB: Polybutene

Short Name
CTP - Commodity Thermoplastics
General Properties
Chemical Formula
Structural Formula


Glass Transition Temperature
-30 to -20 °C
Melting Temperature
115 to 135 °C
Melting Enthalpy
128 J/g
Decomposition Temperature
450 to 460 °C
Young's Modulus
240/600 to 700 MPa
Coefficient of Linear Thermal Expansion
110 to 140 *10¯6/K
Specific Heat Capacity
1.8 to 2.0 J/(g*K)
Thermal Conductivity
0.17 to 0.22 W/(m*K)
0.89/0.91 to 0.94 g/cm³
Semi-crystalline thermoplastic
General properties
High-temperature resistance. Good chemical resistance to solvents, oils, fats, acids and bases
Injection moulding, extrusion
Pipelines (e.g., underfloor heating, drinking water pipelines) Food packaging (films, often with PE and PP) Hotmelt adhesives Compounds and masterbatches

Internet Links

NETZSCH Measurements

DSC 204 F1 Phoenix®
Sample Mass
11.06 mg
Isothermal Phase
8 min
Heating/Colling Rates
10 K/min
Al, pierced
N2 (40 ml/min)


Along with a glass transition at -27°C (midpoint) with a Δcp of approx. 0.10 J/(g·K), the semi-crystalline plastic shows an endothermal melting range – quite narrow for plastics – in the 2nd heating (green) with a main peak temperature of 119°C.
It can be concluded from this peak shape that the molecular weight distribution is largely homogenous. The corresponding heat of fusion amounts to 42 J/g and is therefore significantly smaller than in the 1st heating (blue, 76 J/g). The smaller downstream melting effect at 129°C in the 2nd heating is much closer to the peak temperature of the main melting effect in the 1st heating (133°C). It can therefore be concluded that during the controlled cooling at a cooling rate of 10 K/min, another crystalline phase formed that was not originally present. The glass transition at -24 °C (midpoint) in the 1st heating is similar to that in the 2nd heating, but it shows a bit smaller step height (Δcp) of 0.08 J/(g·K).

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