Rhodamine Mechanophore Functionalized Mechanochromic Double Network Hydrogels with High Sensitivity to Stress

Li-Jun Wang; Kai-Xiang Yang; Qiang Zhou; Hai-Yang Yang; Jia-Qing He; Xing-Yuan Zhang

doi:10.1007/s10118-019-2293-1

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Rhodamine Mechanophore Functionalized Mechanochromic Double Network Hydrogels with High Sensitivity to Stress

ARTICLE | Updated：2019-07-24

- Rhodamine Mechanophore Functionalized Mechanochromic Double Network Hydrogels with High Sensitivity to Stress
- Chinese Journal of Polymer Science Vol. 38, Issue 1, Pages: 24-36(2020)
- Affiliations：
  
  School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China
- Author bio：
  
  yhy@ustc.edu.cn (H.Y.Y.)
  zxym@ustc.edu.cn (X.Y.Z.)
- Funds：
- DOI：10.1007/s10118-019-2293-1
  CLC：
- Received：26 April 2019，
  
  Revised：2019-5-10，
  
  Accepted：14 May 2019，
  
  Online First：24 July 2019，
  
  Published：2020-01
- Accepted：
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Citation: Wang, L. J.; Yang, K. X.; Zhou, Q.; Yang, H. Y.; He, J. Q.; Zhang, X. Y. Rhodamine mechanophore functionalized mechanochromic double network hydrogels with high sensitivity to stress. Chinese J. Polym. Sci. 2020, 38, 24–36

Li-Jun Wang, Kai-Xiang Yang, Qiang Zhou, et al. Rhodamine Mechanophore Functionalized Mechanochromic Double Network Hydrogels with High Sensitivity to Stress[J]. Chinese Journal of Polymer Science, 2020, 38(1): 24-36.
Citation: Wang, L. J.; Yang, K. X.; Zhou, Q.; Yang, H. Y.; He, J. Q.; Zhang, X. Y. Rhodamine mechanophore functionalized mechanochromic double network hydrogels with high sensitivity to stress. Chinese J. Polym. Sci. 2020, 38, 24–36 DOI： 10.1007/s10118-019-2293-1.

Li-Jun Wang, Kai-Xiang Yang, Qiang Zhou, et al. Rhodamine Mechanophore Functionalized Mechanochromic Double Network Hydrogels with High Sensitivity to Stress[J]. Chinese Journal of Polymer Science, 2020, 38(1): 24-36. DOI： 10.1007/s10118-019-2293-1.

摘要

Abstract

Mechanochromic hydrogels

a new class of stimuli-responsive soft materials

have potential applications in a number of fields such as damage reporting and stress/strain sensing. We prepared a novel mechanochromic hydrogel using a strategy that has been developed to prepare dual-network (DN) hydrogels. A hydrophobic rhodamine derivative (Rh mechanophore) was covalently incorporated into a first network as a cross-linker. This first network embedded with Rh mechanophore within the DN hydrogel was pre-stretched. This guaranteed that the stress could be transferred extensively to the Rh-crosslinked first network once the hydrogel was under an applied force. Interestingly

we found that the threshold stress required to activate the mechanochromism of the hydrogel was less than 200 kPa

and much less than those in previous reports. Moreover

because of the excellent sensitivity of the hydrogel to stress

the DN hydrogel exhibited reversible freezing-induced mechanochromism. Benefiting from the sensitivity of Rh mechanophore to both pH and force

the DN hydrogel showed pH-regulated mechanochromic behavior. Our experimental results indicate that the preparation strategy we used introduces sensitive mechanochromism into the hydrogel and preserves the advantageous mechanical properties of the DN hydrogel. These results will be beneficial to the design and preparation of mechanochromic hydrogels with high stress sensitivity

and foster their practical applications in a number of fields such as damage reporting and stress/strain sensing.

关键词

Keywords

references

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