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Master Thesis-Mengxue Zhang-new.pdf (2.79 MB)

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INFLUENCE OF SODIUM SALTS ON THE SWELLING AND RHEOLOGY OF HYDROPHOBICALLY CROSSLINKED, NON-IONIC HYDROGELS DETERMINED BY QCM-D

Zhang, Mengxue
http://orcid.org/0000-0001-9790-5655
http://rave.ohiolink.edu/etdc/view?acc_num=akron1555682656086202

Abstract Details

2019, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
Hydrophobically modified copolymers provide a versatile platform for tough and self-healing hydrogels. Here, we describe how two different sodium salts with anions that span from Kosmotropes (Na2SO4) to Chaotropes (NaClO4) influence the swelling and mechanical properties of hydrogels based on a statistical copolymer of dimethylacrylamide and 2-(N-ethylperfluorooctane sulfonamide) ethyl acrylate as determined by a quartz crystal microbalance with dissipation (QCM-D). The addition of Na2SO4 leads to deswelling of the hydrogel with nearly a 2.5-fold decrease at 1 M Na2SO4, which leads to nearly an order of magnitude increase in the magnitude of the complex shear modulus. The addition of Na2SO4 also increases the polymer chain conformation and weakens the mobility restriction of FOSA nanodomains, which allow FOSA aggregates to exchange or rearrange and therefore cause the phase angle first near invariant and then increasing. Conversely, NaClO4 first increases the swelling of the hydrogel, which is caused by salt concentration and then decreases, dominated by osmotic pressure. Both Kosmotrope (Na2SO4) and Chaotropes (NaClO4) can influence the rearrangement of FOSA aggregates. When examining the QCM-D data for all of the salts examined, the rheological properties do not scale directly with the swelling extent, which suggests that the salts impact the dynamics of the hydrophobic crosslinks. This salt specificity on the mechanical properties of these non-covalent crosslinked hydrogel is important to understand for any potential biomedical tissue engineering applications of these and similar hydrogels.
Bryan Vogt (Advisor)
Kevin Cavicchi (Committee Member)
Tianbo Liu (Committee Member)
73 p.
Polymers
sodium sulfate; sodium perchlorate; dimethyl acrylamide; 2-N-ethylperfluorooctane sulfonamide ethyl acrylate; QCM-D

Recommended Citations

Citations

  • Zhang, M. (2019). INFLUENCE OF SODIUM SALTS ON THE SWELLING AND RHEOLOGY OF HYDROPHOBICALLY CROSSLINKED, NON-IONIC HYDROGELS DETERMINED BY QCM-D [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555682656086202

    APA Style (7th edition)

  • Zhang, Mengxue. INFLUENCE OF SODIUM SALTS ON THE SWELLING AND RHEOLOGY OF HYDROPHOBICALLY CROSSLINKED, NON-IONIC HYDROGELS DETERMINED BY QCM-D . 2019. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1555682656086202.

    MLA Style (8th edition)

  • Zhang, Mengxue. "INFLUENCE OF SODIUM SALTS ON THE SWELLING AND RHEOLOGY OF HYDROPHOBICALLY CROSSLINKED, NON-IONIC HYDROGELS DETERMINED BY QCM-D ." Master's thesis, University of Akron, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1555682656086202

    Chicago Manual of Style (17th edition)

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