- Low molecular weight monomers are reacted in a polymerization step with very little cross-linking.
- Reaction is triggered by heat, catalyst, and mixing
Urethanes processed with Reaction Injection Molding (RIM)
Silicones processed with injection molding or extrusion
Thermoplastic elastomers
- Processing involves melting of polymers, not thermoset reaction
- Processed by injection molding, extrusion, blow molding, film blowing, or rotational molding
Injection molded soles for footwear
- Advantages of thermoplastic elastomers
Less expensive due to fast cycle times
More complex designs are possible
Wider range of properties due to copolymerization
- Disadvantage of thermoplastic elastomers
Higher creep
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