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LIEDERMANN, K., LAPČÍK, L.
Original Title
Dielectric relaxation in hydroxyethyl cellulose
Type
journal article in Web of Science
Language
English
Original Abstract
This paper presents the results of the dielectric analysis of hydroxyethyl cellulose (HEC) in the temperature range 100-350 K and in the frequency range 20 Hz - 1 MHz. The results show a distinct broad relaxation process in the temperature range 150-250 K with activation energy of about 33.4 MJ/kmol. The strength of the relaxation 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. This increase is interpreted as decrease of the co-operativity of dipole motions with increasing temperature. The origin of relaxation is ascribed to the reorientation of double ethylene oxide groups or part of these.
Key words in English
dielectric relaxation, hydroxyethyl cellulose, hydrogen bridges, molecular dynamics
Authors
RIV year
2000
Released
1. 1. 2000
ISBN
0144-8617
Periodical
Carbohydrate Polymers
Year of study
42
Number
May
State
United Kingdom of Great Britain and Northern Ireland
Pages from
369
Pages to
374
Pages count
6
BibTex
@article{BUT39314, author="Karel {Liedermann} and Lubomír {Lapčík}", title="Dielectric relaxation in hydroxyethyl cellulose", journal="Carbohydrate Polymers", year="2000", volume="42", number="May", pages="369--374", doi="10.1016/S0144-8617(99)00189-7", issn="0144-8617" }