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Although processing via external stimuli is a promising technique to tune the structure and properties of polymeric materials, the impact of magnetic fields on phase transitions in thermoresponsive polymer solutions is not well-understood. As nanoparticle (NP) addition is also known to impact these thermodynamic and optical properties, synergistic effects from combining magnetic fields with NP incorporation provide a novel route for tuning material properties. Here, the thermodynamic, optical, and rheological properties of aqueous poly(N-isopropyl acrylamide) (PNIPAM) solutions are examined in the presence of hydrophilic silica NPs and magnetic fields, individually and jointly, via Fourier-transform infrared spectroscopy (FTIR), magneto-turbidimetry, differential scanning calorimetry (DSC), and magneto-rheology. While NPs and magnetic fields both reduce the phase separation energy barrier and lower optical transition temperatures by altering hydrogen bonding (H-bonding), infrared spectra demonstrate that the mechanism by which these changes occur is distinct. Magnetic fields primarily alter solvent polarization while NPs provide PNIPAM–NP H-bonding sites. Combining NP addition with field application uniquely alters the solution environment and results in field-dependent rheological behavior that is unseen in polymer-only solutions. These investigations provide fundamental understanding on the interplay of magnetic fields and NP addition on PNIPAM thermoresponsivity which can be harnessed for increasingly complex stimuli-responsive materials.
|Original language||English (US)|
|Journal||Journal of Vinyl and Additive Technology|
|State||Published - 2022|
Bibliographical noteFunding Information:
Research reported in this publication was supported by the Office of the Vice President of Research, College of Science and Engineering, and the Department of Chemistry at the University of Minnesota. Research reported in this publication was supported by the Office of the Director, National Institutes of Health, [Award Number S10OD011952]; the content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health. The authors thank the Anton Paar VIP program for the rheometer used in this work. This work was supported partially by the Partnership for Research and Education in Materials (PREM) Program of the National Science Foundation under Award Number DMR‐2122178, and through the National Science Foundation, University of Minnesota MRSEC under Award Number DMR‐2011401. The authors would like to thank Benjamin Yeh of the Bhan research group at the University of Minnesota‐Twin Cities for running BET measurements and analysis.
Anton Paar VIP program; Department of Chemistry at the University of Minnesota; Office of the Director, National Institutes of Health, Grant/Award Number: S10OD011952; Office of the Vice President of Research, College of Science and Engineering, University of Minnesota; Partnership for Research and Education in Materials (PREM) Program of the National Science Foundation, Grant/Award Number: DMR‐2122178; National Science Foundation, University of Minnesota MRSEC, Grant/Award Number: DMR‐ 2011401 Funding information N
© 2022 The Authors. Journal of Vinyl & Additive Technology published by Wiley Periodicals LLC on behalf of Society of Plastics Engineers.
- physical hydrogel
- polymer–nanoparticle suspension
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- 4 Active
Partnership for Research and Education in Materials
University of Texas Rio Grande Valley
7/1/21 → 6/30/27
Project: Research project
IRG-2: Mesoscale Network Materials
Mahanthappa, M., Bates, F. S., Calabrese, M. A., Dorfman, K., Ellison, C. J., Ferry, V. E., Lozano, K., Reineke, T. M. & Siepmann, I.
9/1/20 → 8/31/26
University of Minnesota Materials Research Science and Engineering Center (DMR-2011401)
9/1/20 → 8/31/26
Project: Research project