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Self-healing hydroxypropyl guar gum/poly (acrylamide-co-3-acrylamidophenyl boronic acid) composite hydrogels with yield phenomenon based on dynamic PBA ester bonds and H-bond.
- Source :
-
Colloids & Surfaces A: Physicochemical & Engineering Aspects . Jan2019, Vol. 561, p325-331. 7p. - Publication Year :
- 2019
-
Abstract
- Graphical abstract Highlights • The HPG/ (PAM-co-PAAPBA) composite hydrogels exhibited yield phenomenon. • 3-Acrylamidophenylboronic acid (AAPBA) played double roles in the whole strategy. • The composite hydrogels had self-healing property. Abstract In this report, the self-healable hydrogels containing hydroxypropyl guar gum (HPG), acrylamide (AM) and 3-acrylamidophenylboronic acid (AAPBA) were prepared through a facile strategy. The double bond in AAPBA could polymerize with AM to form copolymers. Moreover, the boronic acid groups of AAPBA can interact with cis-diol of HPG which make AAPBA act not only polymer but cross-linkers simultaneously connecting PAM and HPG chains. The mechanical strength of the hydrogels was systematically investigated as a function of AAPBA content, HPG content, AM content and pH. It was found the hydrogels exhibited higher stress, elongations and self-healing properties due to the synergistic interaction of H-bond and dynamic covalent phenylboronic (PBA)-diol ester bonds. Furthermore, the hydrogels showed yielding phenomenon depending on the content of AM and pH, which could play a vital influence on the crosslinking manners and density. The detailed discussions of the relationship between crosslinking manners and yielding phenomenon provide a better understanding on the appearance of yielding phenomenon and their correlation with hydrogel structure. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BORONIC acids
*HYDROGELS
*HYDROGEN bonding
*NONCARBOXYLIC acids
*COLLOIDAL gels
Subjects
Details
- Language :
- English
- ISSN :
- 09277757
- Volume :
- 561
- Database :
- Academic Search Index
- Journal :
- Colloids & Surfaces A: Physicochemical & Engineering Aspects
- Publication Type :
- Academic Journal
- Accession number :
- 133254041
- Full Text :
- https://doi.org/10.1016/j.colsurfa.2018.10.071