A Well-defined Hierarchical Hydrogen Bonding Strategy to Polyureas with Simultaneously Improved Strength and Toughness

Ting Li; Tian-Ze Zheng; Zhao-Xia Guo; Jun Xu; Bao-Hua Guo

doi:10.1007/s10118-019-2275-3

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A Well-defined Hierarchical Hydrogen Bonding Strategy to Polyureas with Simultaneously Improved Strength and Toughness

ARTICLE | Updated：2021-02-18

- A Well-defined Hierarchical Hydrogen Bonding Strategy to Polyureas with Simultaneously Improved Strength and Toughness
- Chinese Journal of Polymer Science Vol. 37, Issue 12, Pages: 1257-1266(2019)
- Affiliations：
  
  1.Key Laboratory of Advanced Materials (Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
- Author bio：
  
  jun-xu@mail.tsinghua.edu.cn (J.X.)
  bhguo@mail.tsinghua.edu.cn (B.H.G.)
- Funds：
- DOI：10.1007/s10118-019-2275-3
  CLC：
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Ting Li, Tian-Ze Zheng, Zhao-Xia Guo, et al. A Well-defined Hierarchical Hydrogen Bonding Strategy to Polyureas with Simultaneously Improved Strength and Toughness. [J]. Chinese Journal of Polymer Science 37(12):1257-1266(2019)
DOI：

Ting Li, Tian-Ze Zheng, Zhao-Xia Guo, et al. A Well-defined Hierarchical Hydrogen Bonding Strategy to Polyureas with Simultaneously Improved Strength and Toughness. [J]. Chinese Journal of Polymer Science 37(12):1257-1266(2019) DOI： 10.1007/s10118-019-2275-3.

摘要

Abstract

A well-defined quadruple hydrogen bonding strategy involving dimerization of 2-ureido-4[1,H,]-pyrimidone (UPy) units is innovatively designed to prepare polyureas with high overall mechanical properties. Three polyureas containing different amounts of UPy units were synthesized by replacing a portion of isophorone diisocyanate (IPDI) with a UPy-derived diisocyanate. The formation of quadruple hydrogen bonds in hard segments ,via, UPy dimers was confirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The mechanical properties of the polyureas were evaluated by uniaxial tensile testing. Compared to the polyurea without UPy units, remarkable improvements in Young’s modulus, tensile strength, and toughness were simultaneously achieved when UPy units were incorporated. The mechanism behind the strong strengthening effect rooted in the stronger intermolecular forces among hard segments brought by the quadruple hydrogen bonds, which were stronger than the inherent bidentate and monodentate hydrogen bonds among urea groups, and the slower soft segmental dynamics reaveled by both increased ,T,g, and relaxation time of the soft segments. The mechanism behind the strong toughening effect was ascribed to more effective energy dissipation brought by the quadruple hydrogen bonds that served as stronger sacrificial bonds upon deformation. This work may offer new insight into the design of polyurea elastomers with comprehensively improved mechanical properties.

关键词

Keywords

Mechanical propertiesStrengthToughnessQuadruple H-bondsPolyurea elasomers

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