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Ion association to poly(N-isopropylacrylamide) by diffusion and electrophoretic NMR
KTH, School of Chemical Science and Engineering (CHE).
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

PNIPAM (poly(N-Isopropylacrylamide)) is a well-known thermoresponsive polymer. Dissolved in water, it shows a structural change at 32 oC, above which the polymer folds together, and a phase separation occurs. The temperature where the polymer changes structure is known as the LCST (Lower Critical Solution Temperature), and can be modified by adding certain salts to the solution [1]. The mechanism by which the ionic components of the salts affect the LCST is not yet completely understood. The purpose of this master thesis is to study this mechanism.

In order to investigate the mechanism, a combination of diffusion NMR and electrophoretic NMR was used, giving the effective charge per molecule which is directly proportional to the grade of association of ions to the polymer.

The salts tested were: NaCl, NaClO4, NaSO4, NaI, NaSCN and CaCl2 from which the ClO4-, SCN-, and I- ions, as well as Cl- ions from CaCl2, were found to bind to PNIPAM.

Place, publisher, year, edition, pages
2013. , 31 p.
Keyword [en]
PNIPAM, poly(N-isopropylacrylamide), electrophoretic NMR, diffusion NMR, LCST, ion association
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-158534OAI: diva2:778078
Available from: 2015-01-09 Created: 2015-01-09 Last updated: 2015-01-09Bibliographically approved

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