Effect of a functional polymer on the rheology and microstructure of sodium alginate

Lei Du, Amin GhavamiNejad, Zhi Chao Yan, Chandra Sekhar Biswas, Florian J. Stadler*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Here, we report on the effect of functional copolymer poly(N-isopropylacrylamide-co-4-vinyl-phenylboronic acid) (NIBA) on the rheology and network structure formed by sodium alginate (SA) through linear and nonlinear viscoelasticity measurements. The hydrogel moduli at pH 3 increased with increasing NIBA addition, while the yield point decreased. Furthermore, these hydrogels showed strain-softening behavior, weak G″-overshoot marking the onset of nonlinearity, and good self-healing properties after large deformation. The zero-strain nonlinearity parameter (Q0) was found to be more sensitive to NIBA-addition than the linear viscoelastic properties. The blends showed a clear peak in the startup test except for SA alone and the peak intensity increased with increasing NIBA-concentration. Finally, based on all data, gelation mechanism and interaction of SA and NIBA will be clarified.

Original languageEnglish (US)
Pages (from-to)58-67
Number of pages10
JournalCarbohydrate Polymers
StatePublished - Nov 1 2018


  • Fourier-transform-rheology
  • Functional polymer
  • Large-amplitude oscillatory shear
  • Self-healing
  • Sodium alginate

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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