|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Co-nonsolvency of PNiPAM at the transition between solvation mechanisms | | Irmgard Bischofberger
; Davide C. E. Calzolari
; Veronique Trappe
; | | Date: |
28 Oct 2014 | | Abstract: | We investigate the co-nonsolvency of poly-N-isopropyl acrylamide (PNiPAM) in
different water-alcohol mixtures and show that this phenomenon is due to two
distinct solvation contributions governing the phase behavior of PNiPAM in the
water-rich and alcohol-rich regime respectively. While hydrophobic hydration is
the predominant contribution governing the phase behavior of PNiPAM in the
water-rich regime, the mixing contributions governing the phase behavior of
classical polymer solutions determine the phase behavior of PNiPAM in the
alcohol-rich regime. This is evidenced by distinct scaling relations denoting
the energetic state of the aqueous medium as a key parameter for the phase
behavior of PNiPAM in the water-rich regime, while the volume fractions of
respectively water, alcohol and PNiPAM become relevant parameters in the
alcohol-rich regime. Adding alcohol to water decreases the energetics of the
aqueous medium, which gradually suppresses hydrophobic hydration, while adding
water to alcohol decreases the solvent quality. Consequently, PNiPAM is
insoluble in the intermediate range of solvent composition, where neither
hydrophobic hydration nor the mixing contributions prevail. This accounts for
the co-nonsolvency phenomenon observed for PNiPAM in water-alcohol mixtures. | | Source: | arXiv, 1410.7487 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER