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Mechanically customizable lignin bio-elastomers based on tailorable multiscale microstructures
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DOI：10.1016/j.cej.2024.154990.png)
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The development of bio-based polyurethanes (PU) elastomers with well-designed multiscale microstructures to customize their mechanical performances was desired, but remained an ongoing challenge. Herein, a novel strategy of integrating tailorable hard-soft nanophases with multiple hydrogen bond (H-bond) interactions was proposed to construct mechanically customizable PU bio-elastomers. In this strategy, highly reactive lignin with high hydroxyl contents was employed as bio-polyol monomer reacting with hexamethylene diisocyanate (HDI) to construct carbamate bonds with a function of tailoring H-bond degree via altering the feeding ratio of lignin. The rigid lignin cooperating with HDI as hard segments self-assembled to generate phase separated nanostructures. Consequently, the integration of well-defined hard-soft nanophases and multiple H-bond interactions in the synthesized lignin-based PU (LPU) achieved excellent and customizable mechanical performances ranging from highly elastic rubber to highly stiff plastic with ultrahigh strength of 72.8 MPa and unprecedented modulus of 3.5 GPa. Impressively, rubber-like LPU elastomers could recover 90 % of initial stress even after 500 stretching cycles, indicating fascinating resilience and fatigue resistance. More especially, rigid LPU plastics with fully hard domains and dense H-bond networks could be transformed into flexible and bendable paper-like elastomers once eliminating intermolecular H-bond interactions under 60( degrees)C hot water. Thus, this work provides a feasible and promising approach to construct supramolecular PU elastomers with excellent and customizable mechanical performances to extend their on-demand applications.
Keyword:
Lignin
Supramolecular elastomer
Tailored nanophase structure
H -bond interaction
Customizable mechanical performance
期刊
IF:
13.2
论文数:
7.5W
被引数:
48.5W
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引用论文
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