1. Effect of a functional polymer on the rheology and microstructure of sodium alginate
- Author
-
Zhi-Chao Yan, Chandra Sekhar Biswas, Florian J. Stadler, Amin GhavamiNejad, and Lei Du
- Subjects
chemistry.chemical_classification ,Materials science ,Polymers and Plastics ,Organic Chemistry ,02 engineering and technology ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Microstructure ,01 natural sciences ,Viscoelasticity ,0104 chemical sciences ,chemistry ,Chemical engineering ,Rheology ,Peak intensity ,Self-healing hydrogels ,Materials Chemistry ,Copolymer ,0210 nano-technology ,Sodium alginate - Abstract
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 Gā³-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.
- Published
- 2018