FROM ISOLATED COILS TO BRUSHES OF POLY(ETHYLENE OXIDE) GRAFTED ON SILICA - A SPIN-LABELING STUDY

Authors
HOMMEL H HALLI A TOUHAMI A LEGRAND AP
Citation
H. Hommel et al., FROM ISOLATED COILS TO BRUSHES OF POLY(ETHYLENE OXIDE) GRAFTED ON SILICA - A SPIN-LABELING STUDY, Colloids and surfaces. A, Physicochemical and engineering aspects, 111(1-2), 1996, pp. 67-74
Citations number
35
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
111
Issue
1-2
Year of publication
1996
Pages
67 - 74
Database
ISI
SICI code
0927-7757(1996)111:1-2<67:FICTBO>2.0.ZU;2-M
Abstract
Poly(ethylene oxide) chains chemically bonded to silica with grafting ratios of 0.045, 0.057, 0.126 and 0.42 molecule nm(-2) have been studi ed by spin-labelling. The nitroxide free radical gives electron parama gnetic resonance signals sensitive to the microscopic local motion of the segments and also information on the conformations by distinguishi ng between loops and tails with a fast motion and trains with a slow m otion. The range of grafting ratio extends from isolated coils to stro ngly stretched brushes and the crossover from one regime to the other is followed by the resonance spectrum.