Synergistic effect of recycled PET and hyperbranched ionic liquids for toughening epoxy resin

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES

Composites Communications Pub Date : 2025-02-01 DOI:10.1016/j.coco.2025.102286

Yanyou Huang, Liangdong Ye, Qiaoyan Wei, Dacheng Li, Zengju Wu, Liling Zhang, Chuanheng Yu, Ziwei Li, Shaorong Lu

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Abstract

Improving the toughness of epoxy resins is critical for high-performance applications. In this study from molecular structure design, hyperbranched ionic liquids (HBIL) containing imidazole groups were synthesized through a one-step esterification method. These HBIL were subsequently combined with recycled polyethylene terephthalate (PET) to synergistically enhance the toughness of epoxy resins (EP). The mechanical, thermomechanical, and rheological properties, as well as the curing behavior of the epoxy composites, were systematically evaluated. The addition of HBIL reduced the viscosity and curing temperature of the epoxy composite. The impact strength of the epoxy composites with only 6 phr PET was increased from 6.48 kJ/m² to 18.19 kJ/m². Furthermore, the addition of HBIL exhibited a synergistic effect with PET. The epoxy composites added with 6 phr PET and 4 phr HBIL showed an increase in impact strength, elastic modulus, and flexural modulus by 237 %, 28.5 %, and 12.4 %, respectively, and an increase in the glass transition temperature (T_g) by 5.8 °C compared with pure EP. Molecular dynamics (MD) simulations corroborated these experimental results, providing insight into the improved properties. This study introduces an innovative approach to developing epoxy composites with superior performance characteristics.

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.