Facile Mechanochemical Synthesis of Sustainable and Recyclable Network Polyurethanes Using a Biomass-Derived Furan Diol
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초록
내용
Due to environment issues, it is highly demanding to generate recyclable polymers and to use sustainable biomass-derived ingredients. In this work, we utilized 2,5-bis-hydroxymethylfuran (BHMF) as a starting material to produce thermoplastic and network polyurethanes (TPU and NPU) under facile, solvent-free (solid-state) ball-milling conditions. Interestingly, the urethanes bonds may undergo thermally-controlled trans-carbomoylation, a reversible dynamic covalent bond exchange. Because of this chemistry, we can demonstrate the self-healing, reprocessing, and shape memory properties from NPU films. We characterized topology freezing transition temperature (Tv), stress-relaxation behavior using dynamic mechanical analyzer (DMA) under different temperatures. This mechanochemical approach is facile, scalable, extensible to sustainable and recyclable polymers from other biomass-derived chemicals.