Synthesis of Hetroaromatic Polyamide and Imide–Acid-Functional Fe₃O₄ Nanoparticle and Their Effect on Thermal Degradation of PLA

ABSTRACT

A new hetroaromatic polyamide-reinforced polylactic acid (PLA)/functional Fe₃O₄ nanocomposite system was prepared through solution casting method. The hetroaromatic polyamide (PA) was synthesized from 2,5-pyridinedicarboxylic acid and 3,3′-diaminodiphenyl sulfone by direct polycondensation reaction. An imide–acid-functional Fe₃O₄ nanoparticle was prepared using pyromellitic dianhydride and coupling agent. As a potential reinforcement, PA and imide–acid-functionalized Fe₃O₄ were used in a PLA system. Combination of the functional Fe₃O₄ with PA showed a good effect on improving the thermal properties of PLA. The temperature at 5 mass% loss (T₅) was increased from 309°C to 337°C in PLA–PA containing 5 mass% of PA (PLA–PA 5) as compared to the neat PLA. The char yield of PLA–PA–FN 10 was increased from 0.5% to 8.9% as compared to the neat PLA and it was much high as compared to the system containing only 5 mass% of PA or the functional Fe₃O₄.

GRAPHICAL ABSTRACT

KEYWORDS:

• High-performance polymers
• nanocomposites
• polyamides
• thermal properties