Mechanical properties of polyurethane elastomers

What is it about?

Mechanical properties of two-phase systems such as segmented polyurethanes depend on the chemical composition and shape and size of two phases (morphology). Generally longer soft segments give materials of lower strength but higher elongation for the same soft segment concentration (SSC). Polyurethanes with high SSC are soft elastomers while those with those with low SSC could be tough thermoplastics, with a range of materials with intermediate properties. Transition from one type of behavior to the other depends on segment length and SSC.

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Why is it important?

When planning properties one has to select the type and ratio of components for a specific application.