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
- A Well-defined Hierarchical Hydrogen Bonding Strategy to Polyureas with Simultaneously Improved Strength and Toughness
- Chinese Journal of Polymer Science 2019年37卷第12期页码：1257-1266
- Affiliations：
  
  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：
  
  This work was financially supported by the National Natural Science Foundation of China (Nos. 51673110 and 51473085), the Joint Funds of the National Natural Science Foundation of China (No. U1862205), and Tsinghua University-Suzhou Innovation Leading Program (No. 2016SZ0315).
- DOI：10.1007/s10118-019-2275-3
  中图分类号：
- 收稿：2019-03-16，
  
  修回：2019-4-11，
  
  录用：2019-4-15，
  
  网络首发：2019-06-13，
  
  纸质出版：2019-12
- Accepted：
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Li, T.; Zheng, T. Z.; Guo, Z. X.; Xu, J.; Guo, B. H. A well-defined hierarchical hydrogen bonding strategy to polyureas with simultaneously improved strength and toughness. Chinese J. Polym. Sci. 2019, 37, 1257–1266.

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, 2019, 37(12): 1257-1266.
Li, T.; Zheng, T. Z.; Guo, Z. X.; Xu, J.; Guo, B. H. A well-defined hierarchical hydrogen bonding strategy to polyureas with simultaneously improved strength and toughness. Chinese J. Polym. Sci. 2019, 37, 1257–1266. DOI： 10.1007/s10118-019-2275-3.

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, 2019, 37(12): 1257-1266. DOI： 10.1007/s10118-019-2275-3.

摘要

Abstract

A well-defined quadruple hydrogen bonding strategy involving dimerization of 2-ureido-4[1

]-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

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

references

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