Fluorescence tracing the degradation process of biodegradable PBAT: Visualization and high sensitivity

Biodegradable plastics have emerged as a potential solution to the mounting plastic pollution crisis. However, current methods for evaluating the degradation of these plastics are limited in detecting structural changes rapidly and accurately, particularly for PBAT, which contains worrying benzene rings. Inspired by the fact that the aggregation of conjugated groups can endow polymers with intrinsic fluorescence, this work found that PBAT emits a bright blue-green fluoresces under UV irradiation. More importantly, we pioneered a degradation evaluation approach to track the degradation process of PBAT via fluorescence. A blue shift of fluorescence wavelength as the thickness and molecular weight of PBAT film decreased during degradation in an alkali solution was observed. Additionally, the fluorescence intensity of the degradation solution increased gradually as the degradation progressed, and was found to be exponentially correlated with the concentration of benzene ring-containing degradation products following filtration with the correlation coefficient is up to 0.999. This study proposes a promising new strategy for monitoring the degradation process with visualization and high sensitivity.

Automated summary

This study found that PBAT emits bright blue-green fluorescence under UV irradiation and developed a degradation evaluation approach based on fluorescence tracking. The fluorescence wavelength of PBAT shifted blue as the film thickness and molecular weight decreased during degradation. The fluorescence intensity of the degradation solution increased gradually with degradation and exhibited an exponential correlation with the concentration of benzene ring-containing degradation products.