Creep-Resistant Covalent Adaptable Networks with Excellent Self-Healing and Reprocessing Performance <italic style="font-style: italic">via</italic> Phase-Locked Dynamic Covalent Benzopyrazole-Urea Bonds

Miao Xie; Xiao-Rong Wang; Zhan-Hua Wang; He-Sheng Xia

doi:10.1007/s10118-024-3195-4

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Creep-Resistant Covalent Adaptable Networks with Excellent Self-Healing and Reprocessing Performance via Phase-Locked Dynamic Covalent Benzopyrazole-Urea Bonds

RESEARCH ARTICLE | Updated：2024-09-23

- Creep-Resistant Covalent Adaptable Networks with Excellent Self-Healing and Reprocessing Performance via Phase-Locked Dynamic Covalent Benzopyrazole-Urea Bonds
- Chinese Journal of Polymer Science Vol. 42, Issue 10, Pages: 1545-1556(2024)
- Affiliations：
  
  a.State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China
  b.School of Petrochemical Engineering, Liaoning Petrochemical University, Fushun 113001, China
- Author bio：
  
  zhwangpoly@scu.edu.cn (Z.H.W.)
  xiahs@scu.edu.cn (H.S.X.)
- Funds：
- DOI：10.1007/s10118-024-3195-4
  CLC：
- Received：06 May 2024，
  
  Revised：2024-06-16，
  
  Accepted：21 June 2024，
  
  Online First：27 August 2024，
  
  Published：01 October 2024
- Accepted：
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Xie, M.; Wang, X. R.; Wang, Z. H.; Xia, H. S. Creep-resistant covalent adaptable networks with excellent self-healing and reprocessing performance via phase-locked dynamic covalent benzopyrazole-urea bonds. Chinese J. Polym. Sci. 2024, 42, 1545–1556

Miao Xie, Xiao-Rong Wang, Zhan-Hua Wang, et al. Creep-Resistant Covalent Adaptable Networks with Excellent Self-Healing and Reprocessing Performance via Phase-Locked Dynamic Covalent Benzopyrazole-Urea Bonds[J]. Chinese Journal of Polymer Science, 2024, 42(10): 1545-1556. DOI: 10.1007/s10118-024-3195-4.
Xie, M.; Wang, X. R.; Wang, Z. H.; Xia, H. S. Creep-resistant covalent adaptable networks with excellent self-healing and reprocessing performance via phase-locked dynamic covalent benzopyrazole-urea bonds. Chinese J. Polym. Sci. 2024, 42, 1545–1556 DOI： 10.1007/s10118-024-3195-4.

Miao Xie, Xiao-Rong Wang, Zhan-Hua Wang, et al. Creep-Resistant Covalent Adaptable Networks with Excellent Self-Healing and Reprocessing Performance via Phase-Locked Dynamic Covalent Benzopyrazole-Urea Bonds[J]. Chinese Journal of Polymer Science, 2024, 42(10): 1545-1556. DOI: 10.1007/s10118-024-3195-4. DOI：

摘要

Excellent self-healing and reprocessing performance can be obtained owing to the dynamic benzopyrazole-urea bonds. Phase separation from the aggregation of the benzopyrazole-urea bond induced by the hydrogen bonding and π-π stacking is capable of blocking the dissociation of the benzopyrazole urea bond at low temperature

thus endowing the CANs with anti-creep performance. This hard phase locking strategy provides an efficient approach to design CANs materials with both excellent reprocessing and creep-resistance performance.

Abstract

Covalent adaptive networks (CANs) are capable of undergoing segment rearrangement after being heated

which endows the materials with excellent self-healing and reprocessing performance

providing an efficient solution to the environment pollution caused by the plastic wastes. The main challenge remains in developing CANs with both excellent reprocessing performance and creep-resistance property. In this study

a series of CANs containing dynamic covalent benzopyrazole-urea bonds were developed based on the addition reaction between benzopyrazole and isocyanate groups. DFT calculation confirmed that relatively low dissociation energy is obtained through undergoing a five-member ring transition state

confirming excellent dynamic property of the benzopyrazole-urea bonds. As verified by the FTIR results

this nice dynamic property can be well maintained after incorporating the benzopyrazole-urea bonds into polymer networks. Excellent self-healing and reprocessing performance is observed by the 3-ABP/PDMS elastomers owing to the dynamic benzopyrazole-urea bonds. Phase separation induced by the aggregation of the hard segments locked the benzopyrazole-urea bonds

which also makes the elastomers display excellent creep-resistance performance. This hard phase locking strategy provides an efficient approach to design CANs materials with both excellent reprocessing and creep-resistance performance.

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references

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Creep-Resistant Covalent Adaptable Networks with Excellent Self-Healing and Reprocessing Performance via Phase-Locked Dynamic Covalent Benzopyrazole-Urea Bonds

DOI：10.1007/s10118-024-3195-4

摘要

Abstract

关键词

Keywords

references