Compared To Rubber
When compared to rubber which is covalently cross-linked smart rubber it cannot continually hold stress without undergoing some slow plastic deformation and the strain recovery is slow.
Very good compromises that has been obtained while keeping the self-mending property and the high extensibility is when you use water as the plasticizer. Normally you use dodecane, but using water makes the glass transition drop to -15 degrees C and there is also a 500% strain recovery within seconds of when you let the stress go. Another is that when you stretch and hold the samples for up to 10 hours you will not get much creep.
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