Mh. Chen et K. Furusawa, DESORPTION BEHAVIOR OF (TERMINAL-FUNCTIONALIZED) POLYSTYRENES FROM ALUMINA SURFACES - STUDIED BY THE CONTINUOUS ELUTION METHOD, Langmuir, 12(8), 1996, pp. 2015-2018
To explore the desorption behavior of polymers from the solid surfaces
, a new experimental technique was introduced in this research. We ref
erred to it as the ''continuous elution method''. Using this method, t
he desorption behavior of preadsorbed polystyrene (PS) and polystyrene
(PS-X) functionalized by a terminal iminium ion (X) from alpha- and g
amma-alumina surfaces was investigated. The particles preadsorbed by P
S or PS-X were packed into a small column and eluted by various solven
ts. Irreversibility of polymer adsorption can be observed clearly, the
adsorption/desorption amount can be determined, and much new informat
ion on kinetics of desorption, adsorption energy, solvency effect, and
etc. was also obtained. On alpha-alumina, it was found that only the
X-group is the driven force for adsorption, and the adsorbed layer has
a higher energetic state than that on gamma-alumina. A complicated de
sorption kinetics of polymer desorbed from gamma-alumina was observed,
which has a relation to the porosity of adsorbent.