Integrating the peak areas as a function of time reveals the conversion profiles displayed in Figure . As was the case with HA, both reactions underwent a brief period of a very high rate of polymerization before slowing down after approximately 10-15 seconds. The conversion is in agreement with the steady-state approximation for the first 6 seconds, as a linear fit between -ln([M]/[M0]) and time resulted in R 2 values of 0.9944 and 0.9578 for IBOMA and AAm, respectively (Figure ). After 15 seconds, both systems had reached what appeared to be full conversion and a plateau was established. In contrast to the HA system, at high conversions, however, both spectra showed a complete disappearance of all peaks except for those stemming from within the concentric capillary (acetic acid and H2O), as can be seen in Figure . At this stage, shimming the NMR magnet became challenging, often taking several minutes, and manual phase corrections had to be performed for each data point to enable accurate data analysis. This was likely a result of the extremely restricted mobility of the polymer chains cured to a high conversion; however, the same was not observed in the case of HA. Two possible explanations for this difference include: (1) lower inherent glass-transition temperature (Tg) of pHA (-45 °C) compared to both pIBOMA (120 °C) and pAAm (52 °C), permitting more molecular motion thus enabling residual unreacted double bonds to relax/emit signal even late into the reaction, and (2) a higher ultimate conversion being reached by the IBOMA and AAM systems. Since both AAM and IBOMA did not show any resonances aside from those inside the concentric capillary at the end of the reaction, their final conversion could not be determined. However, by adding a small amount of crosslinking PEGDA (2.5%) to the HA system, a network was formed resulting in significantly higher conversion of (~98%) than in neat HA. In this case, despite this high conversion and more restricted mobility compared to linear HA, broad peaks corresponding to the polymer backbone were still observed even at the very end of the reaction (Figure ). Additionally, shimming and phase corrections did not pose any challenge even during the late stages of the reaction. Thus, it appears that Tg has a significant impact on the ability to collect spectra late into the reaction of a bulk photopolymerization, meaning that the applicability of in situ photopolymerization is limited more by the thermomechanical properties of the polymer formed than merely by the degree to which the reaction has proceeded.