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Microwave absorption in oligomers of ethylene glycol

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Title Microwave absorption in oligomers of ethylene glycol
 
Creator Sengwa, R J
Kaur, Kulvinder
 
Description 325-329
The dielectric properties of biologically and
pharmaceutically important low-molecular weight ethylene glycols H(-OCH2CH2-)n -OH (n=1,2,4,6) were investigated to clarify the
effect of chain length on the dielectric properties. The measurement of dielectric
constant and dielectric loss was carried out over the frequency range 200 MHz
to 20 GHz at temperatures of 25°C to 55°C. It is found that in these molecules
microwave dielectric losses are significant. The dispersion behavior of these
molecules can be represented by Cole-Cole equation. The dielectric properties
of these homologous ethylene glycols are discussed in terms of the effects of
chain length and intermolecular hydrogen bonds regarding the molecular
conformations. These wide frequency range dielectric data have also been
discussed in view of the suitable selection of the oligomer of ethylene glycol
for cosmetic preparations and other pharmaceutical applications with the
intention of protection of the skin from weak microwave radiations present in
the surrounding environment. These systematic microwave dielectric data with
frequency and temperature variation are not available and are provided in this
paper.
 
Date 2012-12-31T19:57:41Z
2012-12-31T19:57:41Z
1999-10
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/15465
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJBB Vol.36(5) [October 1999]