DIELECTRIC-RELAXATION AND RELATIONSHIPS OF LOCAL MOLECULAR MOBILITY IN LINEAR AND COMB-LIKE THERMOTROPIC POLYMERS

Citation
Ti. Borisova et Na. Nikonorova, DIELECTRIC-RELAXATION AND RELATIONSHIPS OF LOCAL MOLECULAR MOBILITY IN LINEAR AND COMB-LIKE THERMOTROPIC POLYMERS, Macromolecular chemistry and physics, 199(10), 1998, pp. 2147-2152
Citations number
20
Categorie Soggetti
Polymer Sciences
ISSN journal
10221352
Volume
199
Issue
10
Year of publication
1998
Pages
2147 - 2152
Database
ISI
SICI code
1022-1352(1998)199:10<2147:DAROLM>2.0.ZU;2-Q
Abstract
The dielectric behavior of several thermotropic linear and comb-like p olymers with flexible spacers and mesogenic fragments with different s tructure has been studied in a frequency range from 60 Hz to 1 MHz in the bulk state (below the glass transition temperature). Two regions o f dipole relaxation caused by local mobility were detected. It was sho wn that the relaxation parameters of the first process virtually do no t change with increasing spacer length and have similar values in poly mers with different structure. In the case of the second process, the increase in spacer length considerably increases the mobility of kinet ic elements.