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 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 language | English (US) |
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Pages (from-to) | 58-67 |
Number of pages | 10 |
Journal | Carbohydrate Polymers |
Volume | 199 |
DOIs | |
State | Published - Nov 1 2018 |
Funding
The authors would like to thank the National Science Foundation of China ( 21574086 ), Nanshan District Key Lab for Biopolymers and Safety Evaluation (No. KC2014ZDZJ0001A ), Shenzhen Sci & Tech research grant ( ZDSYS201507141105130 ) and Shenzhen City Science and Technology Plan Project ( JCYJ20140509172719311 ) for financial support.
Keywords
- Fourier-transform-rheology
- Functional polymer
- Large-amplitude oscillatory shear
- Self-healing
- Sodium alginate
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry