Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

[PDF] http://dx.doi.org/10.3952/lithjphys.46403

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 46, 441–445 (2006)

DIELECTRIC RELAXATION STUDY OF ETHYL ACRYLATE–ALCOHOL MIXTURES USING TIME DOMAIN REFLECTOMETRY
P. Sivagurunathan^a, K. Dharmalingam^a, K. Ramachandran^a, B. Prabhakar Undre^b, P.W. Khirade^b, and S.C. Mehrotra^c
^aDepartment of Physics, Annamalai University, Annamalai Nagar-608002, Tamilnadu, India
E-mail: mukdhar97@rediffmail.com
^bDepartment of Physics, Dr. B.A. Marathwada University, Aurangabad-431004, Maharashtra, India
^cDepartment of Electronics and Computer Science, Dr. B.A. Marathwada University, Aurangabad-431004, Maharashtra, India

Received 27 September 2006

Dielectric relaxation measurements on ethyl acrylate–alcohol (1-propanol, 1-butanol, 1-hexanol, and 1-octanol) mixtures for different concentrations over the frequency range 10 MHz–10 GHz have been carried out using time domain reflectometry. Parameters such as the static permittivity, dielectric relaxation time, the Kirkwood correlation factor, and the excess inverse relaxation time were determined and discussed to yield information on the molecular structure and dynamics of the mixture. The values of the dielectric properties decrease with increased ethyl acrylate concentration in alcohol and systematically vary with the alkyl chain length of alcohols. The excess inverse relaxation time values are found to be negative for all concentrations, it may indicate that the effective dipoles of the system rotate slowly.

Keywords: dielectric, time domain reflectometry, alcohols, ethyl acrylate

PACS: 77.22.Ch, 77.22.Gm, 77.84.Nh

ETILO AKRILATO IR ALKOHOLIO MIŠINIŲ DIELEKTRINĖS RELAKSACIJOS TYRIMAS, NAUDOJANT LAIKINĘ REFLEKTOMETRIJĄ
P. Sivagurunathan^a, K. Dharmalingam^a, K. Ramachandran^a, B. Prabhakar Undre^b, P.W. Khirade^b, S.C. Mehrotra^b
^aAnamalai universitetas, Anamalai Nagaras, Tamilnadu, Indija
^bDr. B.A. Marathwada universitetas, Aurangabadas, Maharaštra, Indija

Pateikti etilo akrilato ir alkoholio mišinių (1-propanolio, 1-butanolio, 1-heksanolio ir 1-oktanolio) dielektrinės relaksacijos matavimų duomenys 10 MHz–10 GHz dažnių ruože, panaudojant reflektometriją laike. Išmatuoti ir aptarti tokie parametrai, kaip statinė dielektrinė skvarba, dielektrinės relaksacijos trukmė, Kirkvudo (Kirkwood) koreliacijos faktorius bei relaksacijos trukmė, kurie leidžia gauti naują informaciją apie molekulių sandarą mišiniuose ir mišinių dinamiką. Atrasta, kad dielektrinė konstanta mažėja, didinant etilo akrilato koncentaciją alkoholyje, o alkoholio grandinėlių ilgis sistematiškai keičiasi. Rasta, kad perteklinės relaksacijos trukmės vertės yra neigiamos esant visoms koncentracijoms, kas liudija, kad dipolių sukimasis mišiniuose yra lėtas.

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