Degradation reactions involving EY and ErB were conducted under white LED illumination in toluene solvent. For PPT, similar conditions but 400 nm LED light was preferred due to absorption characteristics. The solvent was removed in vacuo at ambient temperature in order to prevent the loss of degraded products with low molecular weights. After 6 h of irradiation, obtained degraded polymers were analyzed by gelpermeation chromatography (GPC). Number average molecular weight (Mn) losses were defined as degradation yield (Fig. ). Degradation using PPT yielded exceptional results compared to ErB and EY photocatalysts, which share similar yields after 6 h of irradiation. LC-MS results revealed the presence of oligomers with molecular weights lower than 800 g mol -1 . (Fig. ) Photodegradation kinetics were investigated by taking aliquot samples from reaction media in different time intervals for the GPC analyses to determine the optimal time for the completion of degradation. Molecular weight and dispersity changes of PPT-catalyzed degradation of P(MMA-co-MCA) are tabulated in Table and chromatograms can be seen in Fig. . GPC chromatograms displayed an immense loss of molecular weight in 6 to 9 h. In 24 h, almost all polymers were degraded into oligomers. The kinetics analysis of the method with EY, demonstrated promising but slower degradation compared to PPT. The kinetics of EY-catalyzed degradation are tabulated in Table and GPC chromatograms are observable in Fig. . Although both sets of chromatograms exhibited degradation, PPT-catalyzed method was more efficient than EY-catalyzed alternative. Mn a (kg mol -1 )