Abstract
This paper presents the results of the dielectric analysis of hydroxyethyl cellulose (HEC) in the temperature range 100–350K and in the frequency range 20Hz–1MHz. The results show a distinct broad relaxation process in the temperature range 150–250K with activation energy of about 33.4MJ/kmol. The strength of the relaxation, ϵs−ϵ∞, increases only slightly with temperature and the apparent increase of the height of the relaxation maximum is attributed to an increase of the co-operativity parameter α. This increase of α is interpreted as decrease of the co-operativity of dipole motions with increasing temperature. The origin of the relaxation is ascribed to the reorientation of double ethylene oxide groups or part of these.
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