Figure 33.

(A) Photographs showing sequential recovery from the temporary shape (spiral) to the permanent shape (strip) of network 3 at 60 °C. (B) Optical micrographs of scratches on the (thio)urethane network samples. Network 1 (i) before and (ii) after heating at 60 °C for 2 h. Network 3 (iii) before and (iv) after heating at 60 °C for 72 h. Network 3 (v) before and (vi) after heating at 120 °C for 10 min. Network 2 (vii) before and (viii) after heating at 70 °C for 72 h. Network 4 (ix) before and (x) after heating at 60 °C for 72 h. Solid arrows point to the wider scratches made with a scalpel blade, whereas the dashed arrows point to the narrower scratches made with a razor blade. Adapted with permission from ref (271). Copyright 2015 Royal Society of Chemistry.