Abstract
Growing environmental concerns have driven the rapid development of sustainable, renewable, biomass-based polymers. Herein, magnolol-based polyurethanes (PU) were synthesized by polyaddition with hexamethylene diisocyanate (HDI) and methylene diphenyl diisocyanate (MDI), respectively. The biomass-based polyurethanes had high molecular weight (up to 26600 g/mol) and a glass transition temperature (Tg) higher than room temperature (Tg > 50 °C). And then thermosetting films were prepared by thiol-ene photo-click reaction. The obtained magnolol-based PU networks (MPUN) shown Young’s modulus of 2.1 GPa and tensile strength of 57 MPa. Shape memory behaviors could be observed in these MPUN. The MPUN could be proceed into various shapes, and then quickly returned to initial states after being heated to 80 °C. More importantly, the MPUN are transparent, yet could shield 99 % of the UVB and UVC irradiation. This study demonstrates a powerful strategy for developing high performance and multifunctional biomass-based polymeric networks from lignin-based renewable products.
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