Abstract
Due to biophenol being inherently antioxidant inefficient and cost intensive, it has no choice but to modify its chemical structure for large-scale applications. Cardanol-heterocyclic amines (BAOs) were prepared by a two-step method based on the intramolecular synergistic antioxidant effects of cardanol and nitrogen-containing heterocycles. Their thermal properties and antioxidant and photostability properties in polylactic acid (PLA) were analyzed. The cardanol-heterocyclic amines exhibited high initial decomposition temperatures as high as 380 °C. In addition, with the addition of 1% content of them to PLA, the tensile strength retention rate remained at 35% after 48 h of photoaging, which was 2–2.5 times higher than that of commercial antioxidant butylated hydroxytoluene (BHT) and remained at 67% after 144 h of thermal-oxidative aging, which was about 2 times higher than that of BHT. Among four cardanol-heterocyclic amines, BAO4 possessed superior photostability and antioxidant properties, presenting an intramolecular synergy between OH, N, and S.
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