Lu, QingyeHu, JinguangLiu, Xinyao2022-11-152020-09-23Liu, 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.http://hdl.handle.net/1880/115475https://dx.doi.org/10.11575/PRISM/40442Over 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.enUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.HydrogelSelf-RecoverabilityNanocellulose CrystalHydrophobic Force.Chemistry--Generalmaster thesis