| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Reentrant Behavior of Poly(N-isopropylacrylamide)Brushes in Water−Methanol Mixtures Investigated with aQuartz Crystal Microbalance
|
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - The solvent composition induced reentrant behavior of poly(N-isopropylacrylamide) (PNIPAM) chainsgrafted on a SiO2 surface in water−methanol mixtures was investigated using a quartz crystal microbalancewith dissipation monitoring (QCM-D) at 20 °C. The frequency and energy dissipation responses showedthat the grafted PNIPAM chains sharply collapse when the methanol content (xm) reaches ∼17 mol %. Inthe range 17−50 mol %, the grafted chains remain in a collapsed state. Further increase of the methanolcontent leads to an abrupt reswelling of the collapsed chains at xm> ∼50 mol %. The sharp reentrantswelling-to-collapse-to-swelling transition was attributed to the water−methanol complexation instead ofthe preferential adsorption effect. Our results also suggest that the water−methanol complexation is notinduced by hydrophobic interaction but by hydrogen bonding.
|
| article type
| |
| is part of this journal
| |
