We monitor the depolymerization kinetics by weighing the residual mass of the polymer sample at varied durations. The PI-ester depolymerized the fastest, completing within 12 hours (Figure ). Importantly, PI-ester samples showed little swelling, suggesting that the depolymerization reaction rate exceeded the rate of diffusion. Initially, the other four PI networks showed significant swelling -gaining mass during the first few hours as the solution infiltrates the network-prior to sufficient transesterification disrupting network percolation resulting in the macroscopic films breaking apart (Figure ). Chemical analysis using 1 H-NMR of the resulting small molecules confirms the formation of methyl esters at 3.76 ppm shifting from the original mercaptopropionate peak at 4.03 ppm (Figure ). The aromatic ester adjacent proton peaks also shift from the ester monomer at 4.75 ppm to the degraded monomer's methyl ester location at 3.79 ppm. Thus, we conclude that transesterification with methanol is successful in depolymerizing