Detail publikace

Dielectric relaxation in hydroxyethyl cellulose

Originální název

Dielectric relaxation in hydroxyethyl cellulose

Anglický název

Dielectric relaxation in hydroxyethyl cellulose

Jazyk

en

Originální abstrakt

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.

Anglický abstrakt

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.

BibTex


@article{BUT39314,
  author="Karel {Liedermann} and Lubomír {Lapčík}",
  title="Dielectric relaxation in hydroxyethyl cellulose",
  annote="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.",
  chapter="39314",
  doi="10.1016/S0144-8617(99)00189-7",
  howpublished="print",
  number="May",
  volume="42",
  year="2000",
  month="january",
  pages="369--374",
  type="journal article"
}