Self-Recoverable Dual Physically Cross-Linked Hydrogels Incorporating Hydrophobic Interactions
Date
2020-09-23
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Abstract
Over the past few years, self-recoverable hydrogels with desirable mechanical properties have attracted a lot of interests. However, the incorporating of hydrophobic force in hydrogel was not well studied to improve the mechanical properties of self-healing materials compared to electrostatic interactions and hydrogen bonding. In this study, a novel dual physically cross-linked (DPC) hydrogel with self-recoverability was mainly cross-linked and strengthened by hydrophobic interactions between the hydrocarbon chains C8 and C18, in addition to electrostatic and hydrogen bonding between N,N-dimethylacrylamide (DMAc) and cellulose nanocrystal (CNC). C18 alkyl chain was grafted to N-[3-(Dimethylamino)propyl] methacrylamide (DMAPMA) to obtain hydrophobic monomer DMAPMA-C18. Hydrophobic CNC-C8was obtained by grafting C8 to the surface using silane chemistry. Then the DPCCNC-g-DMAc-DMAPMA-C18 (CNC DPC) hydrogels and CNC-C8-g-DMAc-DMAPMA-C18 (CNC-C8 DPC) hydrogels were prepared. The optimum CNC-C8 DPC hydrogel with 0.0675 w/v % DMAPMA-C18 and 0.4 w/v % CNC-C8 possessed excellent elongation of 4267.85%?1445.58%, nominal stress of 331.05?32.06 kPa, true stress of 14463.99?2939.98 kPa, compressive tress of 2822.77 kPa at the strain of 90%, facile self-recovery with tetrahydrofuran on the cut surfaces, as well as high water absorption ability of 19.87?0.64 g/g with well-retained shape.
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Keywords
Hydrogel, Self-Recoverability, Nanocellulose Crystal, Hydrophobic Force.
Citation
Liu, X. (2020). Self-Recoverable Dual Physically Cross-Linked Hydrogels Incorporating Hydrophobic Interactions (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.