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Beta dielectric dispersion in natural rubber latex
Author(s) -
Laogun Abimbola A.
Publication year - 1986
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1986.070320527
Subject(s) - natural rubber , arrhenius equation , enthalpy , dielectric , dispersion (optics) , materials science , relaxation (psychology) , thermodynamics , atmospheric temperature range , viscosity , activation energy , polymer chemistry , composite material , chemistry , physics , optics , psychology , social psychology , optoelectronics
The dielectric dispersion of natural rubber latex has been investigated over a frequency range of 0.1–100 MHz and at six temperatures from 20° to 70°C. A computer analysis of the dispersion data showed that the Cole–Cole structural equation gave a better fit than the Debye. The large values of the Cole‐Cole α spread parameter suggest heterogeneity of structure in rubber latex. The latex viscosity and the relaxation time were both found to be influenced by changes in temperature. Application of the Arrhenius temperature equation to the data yielded a mean activation enthalpy of 32.6 ± 2.8 kJ/mol for the relaxation process.