Recyclable and biodegradable bio-based polyurethane elastomers with exceptional mechanically properties

Abstract

Bio-based polyurethanes (BPUs) have garnered significant attention due to their sustainable nature and potential to replace conventional petroleum-based PUs. This study delves into the synthesis, characterization, and application of a novel BPU variant, BPUPEG, derived from A-B-A triblock polyols. DSC tests highlighted the crystallization properties of the PEG block within BPUPEG, setting it apart from other BPU samples. Structural insights were further obtained from POM and WAXS tests, revealing the nanocrystalline structures and differences among the BPU samples. Mechanical testing showcased BPUPEGs superior fracture stress and strain, emphasizing its enhanced mechanical properties. Biodegradation experiments were conducted, underscoring the environmentally benign nature of all BPUs, with BPUPEG demonstrating a slower hydrolysis rate attributed to its PEG crystalline phase. Importantly, BPUPEGs degradation byproducts were ascertained to be non-toxic, emphasizing its eco-friendly attributes. The study also explored BPUPEGs recyclability, confirming its potential for multiple reuse cycles without degradation in mechanical properties. In conclusion, BPUPEG emerges as a sustainable, high-performance BPU, holding promise for diverse applications in the future, aligning with global sustainability and carbon reduction goals.