Fig. 2.

Macro-CTAs containing long wing blocks minimize interchain crosslinking. a The successful scale-up preparation of unfoldable SCNGs mediated by macro-CTA containing long protective wing blocks (green sphere). The growth boundary (purple sphere) of each polymer chain is embedded in the long wing blocks, thereby preventing interchain crosslinking at a high reactant concentration. b The procedure of preparing non-unfoldable SCNGs. c The scheme of preparing a non-foldable linear control polymer (orange sphere). d Illustration of the failed preparation of SCNGs mediated by CTAs with short or no wing blocks. The growth boundaries of the polymer chains easily overlap at high concentration