Characteristics of self-healable laponite-poly(N-isopropylacrylamide) hydrogels prepared by γ-ray irradiation

Jungin Kim, Inwook Oh, Sooji Park, Ngoc Quang Nguyen, Jungju Ryu, Daewon Sohn

Research output: Contribution to journalArticlepeer-review

Abstract

There have been many strategies and efforts to develop nanocomposite gels for wide applications that display desirable strength and properties, such as self-healing. In this study, self-healable laponite-poly(N-isopropylacrylamide) hydrogels were prepared by γ-ray radiation employing stepwise processes that provide gelation without any chemicals for crosslinking and initiation. This method achieved self-healable properties similar to that of typical gels crosslinked using crosslinkers and initiators. We found that the main factor of the property is the homogeneous distribution of laponite particles, based on comparisons of samples prepared using various synthetic strategies. Regarding the relationship between synthetic methods and their respective properties, the samples were characterized via swelling ratios, rheological properties, cross-sectional images, and nanostructures. The uniformity of the networks was evaluated with mesoscopic structures associated with large inhomogeneities and nanostructures described with interparticle distances at different swelling ratios. The results indicate that the stepwise process of the radiation method generates dense networks with uniform structures, which leads to self-healing ability. Consequently, we suggest that gelation by γ-ray irradiation can provide better properties via effective chemical controls.

Original languageEnglish
Article number123365
JournalPolymer
Volume214
DOIs
StatePublished - 2021 Feb 1

Keywords

  • Clay
  • Gamma-ray irradiation
  • Hydrogel
  • NIPAM
  • Self-healing

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