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Journal of Polymer Research

, 26:52 | Cite as

Preparation of konjac glucomannan–borax hydrogels with good self-healing property and pH-responsive behavior

  • Cunzhen Song
  • Yukai Lv
  • Kaiyao Qian
  • Yulong ChenEmail author
  • Xin QianEmail author
ORIGINAL PAPER
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Abstract

In this study, konjac glucomannan (KGM)–sodium tetraborate (borax) hydrogels with good self-healing property and pH-sensitivity were successfully prepared via a simple one-step method. The effects of KGM and borax contents on the morphology, rheological viscoelasticity, mechanical properties and self-healing performance of the hydrogels were systematically investigated. The results of infrared spectroscopy and scanning electron microscope confirmed the generation of boron-oxygen bonds in the hydrogels. The rheological behavior of the hydrogels further revealed that the cross-linking density of the hydrogel system is positively correlated with borax concentration. Due to this fact, the mechanical properties are enhanced with increasing the borax content. For their self-healing performance, we observed that the recovery rate of the tensile strength is significantly faster than that of the elongation rate at break. Particularly, we found that hydrogel with 6 wt% of KGM exhibits the best self-healing performance, i.e., after 5 min of self-healing, the mechanical properties can recover by 95%. Besides, the KGM–borax hydrogels also show a good and recyclable pH-responsive behavior.

Keywords

Konjac glucomannan Hydrogel Self-healing pH-responsive 

Notes

Acknowledgments

This work was supported by the National Natural Science Foundation of China (51703198) and the General Scientific Research Project of Department of Education of Zhejiang Province, China (Y201636251).

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Copyright information

© The Polymer Society, Taipei 2019

Authors and Affiliations

  1. 1.College of Materials Science and EngineeringZhejiang University of TechnologyHangzhouPeople’s Republic of China

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