Abstract Blending recycled poly(ethylene terephthalate) (RPET) with biobased polyamide 11 (PA‐11) offers a promising route toward sustainable engineering plastics; however, its broader application is limited by inherent immiscibility and reduced toughness. In this study, a hybrid reinforcement strategy employing one‐dimensional halloysite nanotubes (HNTs) and two‐dimensional graphene nanoplatelets (GNPs) was investigated in a Joncryl®‐compatibilized RPET/PA‐11 matrix to enhance both mechanical and thermal performance. By maintaining a constant total nanofiller loading of 2 phr and systematically varying the HNT‐to‐GNP ratio, the individual and synergistic effects of the hybrid fillers were isolated. The optimized hybrid composition (1.4 phr HNTs/0.6 phr GNPs) exhibited a balanced enhancement of properties, achieving a tensile strength of 63.5 MPa, flexural strength of 113.6 MPa, Young's modulus of 1414 MPa, and a markedly improved impact resistance of 732 J m −1 . Spectroscopic and morphological analyses indicated that this performance arises from strengthened interfacial interactions and uniform hybrid filler dispersion at intermediate GNP contents, whereas higher GNP loadings led to agglomeration and diminished effectiveness. Thermal analyses further revealed increased glass transition and crystallization temperatures, along with a delayed onset of thermal degradation from 370 to 412 °C, consistent with the formation of an effective hybrid barrier network. Overall, the results demonstrate that geometry‐complementary hybrid nanofillers provide an effective pathway for upcycling RPET/PA‐11 blends into mechanically robust and thermally stable materials suitable for demanding engineering applications. © 2026 Society of Chemical Industry.
Khan et al. (Thu,) studied this question.
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