Cellulose

, Volume 25, Issue 1, pp 549–558 | Cite as

Cyclic cryogelation: a novel approach to control the distribution of carbonized cellulose fibres within polymer hydrogels

  • Bijan Nasri-Nasrabadi
  • Akif Kaynak
  • Zahra Komeily Nia
  • Abbas Kouzani
Original Paper
  • 102 Downloads

Abstract

The fabrication of conductive composite hydrogels is still challenging mainly because of the heterogeneous distribution of conductivity across the structure. Carbon substrates are mostly used to induce conductivity in the polymer hydrogels. The first step towards an effective induction of conductivity is to reach a uniform dispersion of carbon within the hosting matrix. This paper describes a new cyclic cryogelation method for the fabrication of conductive hydrogels using chitosan as the polymer matrix and conductive cellulose based fibres as the filler. This is achieved by the cyclic thermal treatment of gelatinized chitosan solution, and orderly control of the hydrogen bonding network formation before the solvent evaporation. These networks regularly limit the chain mobility of polymer across the hydrogel and restrict the agglomeration of fibres within the matrix. As a result, a significant improvement in the homogeneity of conductivity across the treated hydrogel was achieved, shown by thermal camera mapping. In addition, the thermally treated chitosan/20 wt% fibres demonstrated a tensile strength improvement of about 50% compared to that of the untreated composite. The proposed method offers a good control of fibre dispersion within the polymer matrix, and can serve as a practical design concept for 3D conductive hydrogels in biotechnological applications.

Keywords

Carbonized cellulose fibres Cyclic cryogelation Conductive hydrogels Uniform dispersion 

Supplementary material

10570_2017_1544_MOESM1_ESM.docx (1000 kb)
Supplementary material 1 (DOCX 999 kb)

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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  1. 1.School of EngineeringDeakin UniversityGeelongAustralia
  2. 2.Institute for Frontier Materials, Deakin UniversityGeelongAustralia

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