R. Pelster et al., ON MESOSCOPIC WATER DROPLETS DISPERSED IN BUTYL RUBBER, Berichte der Bunsengesellschaft fur Physikalische Chemie, 97(5), 1993, pp. 666-675
Citations number
25
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
Water dispersed in butyl rubber containing hydrophilic components has
been studied with differential scanning calorimetry, dielectric spectr
oscopy in the frequency range from 5 Hz to 10 GHz, thermally stimulate
d depolarisation currents, and small angle X-ray measurements. Hydroph
ilic components in the rubber matrix act as adsorption sites for water
molecules. Two populations of water droplets with radii of the order
of magnitude of 2 nm are formed. In the mesoscopic hydrophobic confine
ment the dielectric relaxation of the liquid water droplets is shifted
to higher frequencies compared with bulk water. The relaxation of wat
er in the frozen droplets is slower compared to that of bulk ice. Neit
her molecular water nor clusters of bulk water are found in the rubber
.