Desorption Behavior of (Terminal-Functionalized) Polystyrenes from Alumina Surfaces. Studied by the Continuous Elution Method

Abstract

To explore the desorption behavior of polymers from the solid surfaces, a new experimental technique was introduced in this research. We referred to it as the “continuous elution method”. Using this method, the desorption behavior of preadsorbed polystyrene (PS) and polystyrene (PS-X) functionalized by a terminal iminium ion (X) from α- and γ-alumina surfaces was investigated. The particles preadsorbed by PS or PS-X were packed into a small column and eluted by various solvents. Irreversibility of polymer adsorption can be observed clearly, the adsorption/desorption amount can be determined, and much new information on kinetics of desorption, adsorption energy, solvency effect, and etc. was also obtained. On α-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 γ-alumina. A complicated desorption kinetics of polymer desorbed from γ-alumina was observed, which has a relation to the porosity of adsorbent.

Liquid chromatography of polymer mixtures by a combination of exclusion and full adsorption mechanisms. Three- and four-component polymer blends

“…The non-porous FAD column packings give better results [21] possibly because diffusion processes control the desorption of macromolecules from the porous particles. The desorption of macromolecules might depend on the ratio of the polymer/pore size [25][26][27] and the resulting polymer zone would have a complicated shape; on porous adsorbents partially excluded macromolecules tend to outrun the displacer zone. On the other hand, non-porous FAD column packings have low sample capacity that might limit their applicability for multicomponent polymer systems such as copolymers.…”

“…conventionally measured with sample-and timeconsuming static experiments [28]. Furusawa and Chen [25][26][27] proposed a dynamic desorption method for assessing desorption isotherms. Macromolecules were pre-adsorbed on the adsorbent under static conditions.…”

Polydispersity and Functional Group Distribution of Dispersant Polymer: Adsorption Properties and Magnetic Paint Dispersion

“…As for the effect of the functional group, endfunctionalized polymers, which have one functional group at the chain end, have been examined (17,18). The properties of model dispersant polymers were systematically investigated about the type and the content of the functional groups (15,16).…”

Adsorption and Desorption of Macromolecules on the Solid Surfaces Studied by On-Line SEC. 1. The Principle of Method

“…Furusawa et al − proposed an alternative approach to study the desorption processes in a dynamic arrangement. The particles of sorbent on which macromolecules were deposited under static conditions were packed into a column and, subsequently, the preadsorbed polymer was dynamically displaced by an appropriate desorption promoting liquid at a low flow rate.…”