The formation of loops, i.e., another non-elastic feature, shows a similar trend for all systems (Figure ). Initially, loop formation is slow but accelerates, increasing almost linearly with the reaction progress. Higher chain length and functionality boost the probability of loop formation. The highest number was observed in L-6OH (nearly 70% of crosslinkers form loops at 85% conversion). Due to the presence of six reaction sites in HMMM, more complex loops -those with more than two connections with an acrylic chainappear in systems with higher chain length and functionality, see SI section S3.5.