ON MESOSCOPIC WATER DROPLETS DISPERSED IN BUTYL RUBBER

被引:16
作者
PELSTER, R
KOPS, A
NIMTZ, G
ENDERS, A
KIETZMANN, H
PISSIS, P
KYRITSIS, A
WOERMANN, D
机构
[1] NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE
[2] UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE
[3] UNIV COLOGNE,INST PHYS CHEM,W-5000 COLOGNE 41,GERMANY
来源
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 1993年 / 97卷 / 05期
关键词
ADSORPTION; DIELECTRICS; POLYMERS; SPECTROSCOPY; MICROWAVES; X-RAY;
D O I
10.1002/bbpc.19930970505
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Water dispersed in butyl rubber containing hydrophilic components has been studied with differential scanning calorimetry, dielectric spectroscopy in the frequency range from 5 Hz to 10 GHz, thermally stimulated depolarisation currents, and small angle X-ray measurements. Hydrophilic 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 confinement the dielectric relaxation of the liquid water droplets is shifted to higher frequencies compared with bulk water. The relaxation of water in the frozen droplets is slower compared to that of bulk ice. Neither molecular water nor clusters of bulk water are found in the rubber.
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页码:666 / 675
页数:10
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