In the presence of EDA or EDT with shielding group concentrations at mol 50% (PEGMA950), a negligible increase in G' was seen; at 40%, a very slow increase in G' with a final value on the order of 10 3 Pa was demonstrated; and at 30%, a rapid increase in G' with a final G' of 10 4 Pa (Figure ). At higher shielding monomer percentages, gelation was entirely inhibited over the measurement time, even with the quick crosslinking EDT. In both the thiol and amine cases, the trend toward decreasing gel time with increasing PEGMA950 content is the same.