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Bioinspired Polyurethane Using Multifunctional Block Modules with Synergistic Dynamic Bonds

机译：使用具有协同动态键的多功能块模块的生物悬浮的聚氨酯

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摘要

Nature embraces an intriguing strategy to create high-performance biomaterials, such as spider silk which presents an unparalleled combination of stiffness, tensile strength, and toughness via hierarchical structures. However, to fabricate synthetic polymers with such excellent properties remains a challenging task. Inspired by the integration of multiblock backbone and densely H-bonding assemblies in spider silk as well as the delicate iron-catecholate complexes in mussel byssus, we proposed a novel molecular design with multifunctional block modules to obtain polymer materials that exhibit excellent mechanical property, self-healing ability, and reprocessability. It was achieved by introducing reversible iron-catechol (DOPA-Fe3+) cross-links and quadruple H-bonds bearing 2-ureido-4-[1H]-pyrimidinone (UPy) dimers as multifunctional blocks into a segmented polyurethane backbone with urethane blocks and semicrystalline polycaprolactone (PCL) blocks. These two types of dynamic cross-linking knots served as the sacrificial bonds to dissipate energy efficiently under external stress burden, endowing the dual physical cross-linked networks with increased toughness and breaking elongation. Moreover, the DOPA-Fe3+ complexes could increase the crystallization of PCL, leading to remarkably enhanced Young's modulus and tensile strength. Solid-state NMR revealed the formation of quadruple H-bonds in UPy dimers and the presence of DOPA-Fe3+ complexes, which restricted the mobility of the mobile phase and enhanced the crystallinity of the PCL domain. This work provides a feasible way to develop bioinspired materials with self-healable and reprocessable features, in addition to balanced enhancement of both stiffness and toughness.
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  • 来源
    《ACS Macro Letters》 |2021年第5期|共8页
  • 作者

    Wang Fenfen; Yang Zhijun; Li Jian; Zhang Chi; Sun Pingchuan;

  • 作者单位

    Nankai Univ Key Lab Funct Polymer Mat Minist Educ Tianjin 300071 Peoples R China;

    Nankai Univ Key Lab Funct Polymer Mat Minist Educ Tianjin 300071 Peoples R China;

    Nankai Univ Key Lab Funct Polymer Mat Minist Educ Tianjin 300071 Peoples R China;

    Nankai Univ Key Lab Funct Polymer Mat Minist Educ Tianjin 300071 Peoples R China;

    Nankai Univ Key Lab Funct Polymer Mat Minist Educ Tianjin 300071 Peoples R China;

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  • 正文语种 eng
  • 中图分类 有机化学;
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