PU elastomer properties are determined by soft segment length and concentration

What is it about?

Morphology means shape and size of components in a two-phase system. High soft segment concentration (SSC) produces softer elastomers with continuous soft phase and dispersed hard domains. Low SSC generally produces two continuous phases -soft and hard, and higher strength and hardness but lower extensions. Transition from the continuous soft to co-continuous morphology occurs at a specific SSC, which depends on the length of soft and hard segments.

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Why is it important?

Polytetramethylene glycol (polytetrahydrofurane) soft segments offer excellent balance between mechanical properties and hydrolytic stability. Planning properties for a given application is based on selecting right soft segment length and concentration.