Journal
CARBOHYDRATE POLYMERS
Volume 199, Issue -, Pages 58-67Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.07.001
Keywords
Sodium alginate; Functional polymer; Large-amplitude oscillatory shear; Fourier-transform-rheology; Self-healing
Categories
Funding
- National Science Foundation of China [21574086]
- Nanshan District Key Lab for Biopolymers and Safety Evaluation [KC2014ZDZJ0001A]
- Shenzhen Sci & Tech research grant [ZDSYS201507141105130]
- Shenzhen City Science and Technology Plan Project [JCYJ20140509172719311]
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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 non-linear 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 (Q(0)) 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.
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