Self-assembly and surface structure of an amphiphilic graft copolymer, polystyrene-graft-omega-stearyl-poly(ethylene oxide)

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Jian Ji (Author) Other; Linxian Feng (Author) Other; Yongxin Qiu (Author) Other; Xiaojie Yu (Author) Other; Mário Adolfo Barbosa (Author) FEUP

Journal

Title: Journal of Colloid and Interface Science

Vol. 224 No. 2

Pages: 255-260

ISSN: 0021-9797

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 15 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-001-0B1

DOI: 10.1006/jcis.2000.6729

Abstract (EN): Surface properties of the polystyrene-graff-omega-stearyl-poly(ethylene oxide) (PS-g-SPEO) have been characterized by X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), contact angle, and spin probe techniques. The XPS results indicate that the surface and bulk composition of the PS-g-SPEO copolymers differ remarkably from each other. The stearyl and EO components enrich at the copolymer/air interfaces due to the self-assembly of the stearyl groups. At the PS-g-SPEO-72.6 surface (the x in PS-g-SPEO-x indicates the bulk density of the SPEO in wt%), the self-assembly of the hydrophobic stearyl groups is strong enough to form a stable liquid crystalline phase as indicated by DSC, At polymer/water interfaces, PS-g-SPEO-72.6 presents a hydrophilic surface with low PEO mobility, whereas PS-g-SPEO-50.6 and PS-g-SPEO-31.0 present the hydrophobic surface with high PEO mobility. The two different types of the surfaces, with different characters in surface energy, surface mobility of PEG, and surface architecture of SPEO, will be quite valuable as models for detecting the synergistic action of the PEO chains and the stearyl groups (specific ligand for albumin binding) in protein solutions. (C) 2000 Academic Press.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6