State of water inside and at the surface of poly(ethylene glycol) films examined by FT-IR

Citation
M. Ide et al., State of water inside and at the surface of poly(ethylene glycol) films examined by FT-IR, LANGMUIR, 15(4), 1999, pp. 926-929
Citations number
19
Language
INGLESE
art.tipo
Letter
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
LANGMUIR
ISSN journal
0743-7463 → ACNP
Volume
15
Issue
4
Year of publication
1999
Pages
926 - 929
Database
ISI
SICI code
0743-7463(19990216)15:4<926:SOWIAA>2.0.ZU;2-7
Abstract
The state of water and the processes of water adsorption in poly (ethylene glycol) dimethyl ether (PEG-DME) films were studied by FT-IR. From the assi gnment and time evolution of the components of the O-H stretching band, the water adsorption and penetration into the films are considered to proceed as follows. At the polymer surface, (1) a monomeric water adsorbs onto the polymer, and (2) the formation of dimer or trimer is completed after the ad sorption in the polymer matrix is equilibrated. In the polymer matrix, (1) a water molecule penetrates to bind to the oxygen atoms of PEG-DME with one of its hydrogen (H) atoms (binding water), (2) the water binding to the ox ygen atoms of PEG-DME molecules with both of its H atoms (bridging water) i s formed from the binding water, (3) the amount of monomeric species satura tes after the bridging water is equilibrated, and (4) the dimer or trimer i s formed by the aggregation of monomer.