CR: Chloroprene rubber
- Short Name
- CR
- Name
- Chloroprene rubber
- Group
- EM - Elastomers
- General Properties
- Chemical Formula
- Structural Formula
-
Properties
- Glass Transition Temperature
- -45 to -30 °C
- Melting Temperature
- 40 to 75 °C
- Melting Enthalpy
- 1 to 10 J/g
- Decomposition Temperature
- 365 to 380 / 445 to 460 °C
- Young's Modulus
- - MPa
- Coefficient of Linear Thermal Expansion
- 185 to 250 *10¯6/K
- Specific Heat Capacity
- - J/(g*K)
- Thermal Conductivity
- 0.18 to 0.20 W/(m*K)
- Density
- 1.25 g/cm³
- Morphology
- Rubber
- General properties
- Good mechanical properties and elasticity. Good ozone, weather, chemical and aging resistance. High non-inflammability
- Processing
- Thermally with diamine, with hydroxyphenyl or a mixture of zinc and magnesium oxides or by reaction with ethylenethiourea
- Applications
- Technical rubber goods (e.g., seals, profiles). Automobile industry. Electrical industry. Textile industry. Adhesives, hoses, coatings
Internet Links
NETZSCH Measurements
- Instrument
- DSC 204 F1 Phoenix®
- Sample Mass
- 21.18 mg
- Isothermal Phase
- 8 min
- Heating/Colling Rates
- 10 K/min
- Crucible
- Al, pierced
- Atmosphere
- N2 (40 ml/min)
Evaluation
As an amorphous polymer, CR shows a glass transition at approx. -35°C (midpoint) in both heatings with a step height (Δcp) of 0.38 J/(g.K) in the 2nd heating (green).
The small endothermal effect at 45°C (peak temperature) in the 1st heating (blue) is probably due to the melting of an additive, which, in the molten state, dissolves in the elastomer matrix and is therefore no longer visible in the 2nd heating (green).
The small endothermal effect at 45°C (peak temperature) in the 1st heating (blue) is probably due to the melting of an additive, which, in the molten state, dissolves in the elastomer matrix and is therefore no longer visible in the 2nd heating (green).