Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
596902 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2008 | 5 Pages |
Abstract
Non-ionic N-isopropylacrylamide (PNIPAM) microgel is employed to investigate the molecular motion of polymer chains in the swollen and collapsed states. This study is performed using incoherent elastic (IES) and quasielastic neutron scattering (IQNS). IES measurements show an increase of both, the elastic intensity and the oscillations of the polymer network vibrational amplitude at the transition temperature. IQNS was measured at two different selected temperatures 290 K and 327 K corresponding to the swollen and collapsed states, respectively. The diffusion constant from IQNS experiments decreases nearly two orders of magnitude when the microgel de-swells and finally collapses.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Colloid and Surface Chemistry
Authors
J. Rubio-Retama, B. Frick, Tilo Seydel, B. López-Ruiz, A. Fernandez-Barbero, E. López-Cabarcos,