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Polymers 2015, 7(12), 2572-2583; doi:10.3390/polym7121533

Additive Effects on Phase Transition and Interactions in Poly(vinyl methyl ether) Solutions

1
Department of NMR Spectroscopy, Institute of Macromolecular Chemistry AS CR, v.v.i., Heyrovského Sq. 2, 162 06 Prague, Czech Republic
2
Department of Macromolecular Physics, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Prague 8, Czech Republic
3
Department of Vibrational Spectroscopy, Institute of Macromolecular Chemistry AS CR, v.v.i., Heyrovského Sq. 2, 162 06 Prague, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Richard Hoogenboom
Received: 27 August 2015 / Revised: 28 October 2015 / Accepted: 30 November 2015 / Published: 4 December 2015
(This article belongs to the Special Issue Stimuli-Responsive Polymers and Colloids)
View Full-Text   |   Download PDF [2019 KB, uploaded 4 December 2015]   |  

Abstract

A comparative study of thermal response of poly(vinyl methyl ether) in the presence of different hydrophilic and hydrophobic additives was performed by Nuclear magnetic resonance (NMR) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, differential scanning calorimetry (DSC), and optical microscopy. The effect of polymer concentration and additive content on the appearance and extent of the phase transition was determined. A detailed study of interaction mechanism in solutions with two hydrophobic additives showed differences in the way in which polymer globules are formed. For solutions containing t-butyl methyl ketone and t-butanol, measurements of 1H spin-spin relaxations showed the presence of water and additive molecules bound in PVME globular structures. These originally-bound molecules are then slowly released from the globular-like structures. Incorporation of molecules into the globules disrupts the cooperativity of the transition and affects the size of globular structures. View Full-Text
Keywords: additives; LCST; poly(vinyl methyl ether); thermal properties additives; LCST; poly(vinyl methyl ether); thermal properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Starovoytova, L.; Šťastná, J.; Šturcová, A.; Konefal, R.; Dybal, J.; Velychkivska, N.; Radecki, M.; Hanyková, L. Additive Effects on Phase Transition and Interactions in Poly(vinyl methyl ether) Solutions. Polymers 2015, 7, 2572-2583.

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