Modeling of Bottle-Brush Polymer Adsorption onto Mica and Silica Surfaces
2009 (English)In: Macromolecules, ISSN 0024-9297, E-ISSN 1520-5835, Vol. 42, no 16, 6310-6318 p.Article in journal (Refereed) Published
The adsorption of a series of charged bottle-brush polymers with side chains of constant length on mica and silica surfaces is modeled using a lattice mean-field theory, and the predicted results are compared to corresponding experimental data. The bottle-brush polymers are modeled as being composed of two types of main-chain segments: charged segments and uncharged segments with an attached side chain. The composition variable X denotes the percentage of charged main-chain segments and ranges from X = 0 (uncharged bottle-brush polymer) to X = 100 (linear polyelectrolyte). The mica-like surface possesses a constant negative surface charge density and no special affinity, whereas the silica-like surface has a constant negative surface potential and a positive affinity for the side chains of the bottle-brush polymers. The model is able to reproduce a number of salient experimental features characterizing the adsorption of the bottle-brush polymers for the full range of the composition variable X on the two surfaces, and thereby quantifying the different nature of the two surfaces with respect to electrostatic properties and nonelectrostatic affinity for the polymer. In particular, the surface excess displays a maximum at X approximate to 50 for the mica surface and at X approximate to 10 for the silica surface. Moreover, the thickest adsorbed layer is obtained at X = 10-25.
Place, publisher, year, edition, pages
2009. Vol. 42, no 16, 6310-6318 p.
IdentifiersURN: urn:nbn:se:kth:diva-18693DOI: 10.1021/ma900896yISI: 000269043200056ScopusID: 2-s2.0-68949188136OAI: oai:DiVA.org:kth-18693DiVA: diva2:336740
QC 201005252010-08-052010-08-052011-01-12Bibliographically approved