(731b) An Versatile Reactive UV Stabilizer for Biodegradable Poly(butylene adipate-co-terephthalate) Films

Functional biodegradable Poly (butylene adipate-co-terephthalate) (PBAT) film covalently linking different amounts of anti-UV moieties in the polymer chains were synthesized via melt blending commercial PBAT with a novel triazine UV stabilizer (TDET) which also functions as a coupling agent.

The ¹H NMR, ¹³C NMR, FTIR and MS spectra confirmed the successful synthesis of TDET. The incorporated TDET showed a fine dispersity into PBAT, leading to better thermal stability and much improved tensile properties of the resulting products. All the composite films possess remarkable UV-blocking capacity at low concentration of TDET. In the accelerated aging test, the TDET stabilized PBAT films delayed the photodegradation process in various level, which is verified by the results of mechanical properties and surface morphology changes. Furthermore, better resistance property to solvent extraction was achieved in the functional PBAT films.

In conclusion, the covalently linking UV stabilizing TDET not only improved the photostability of PBAT but also endowed the functional PBAT with improved mechanical performance and extraction resistance, which is important for the long term use of biodegradable food packaging or agricultural materials.