To read the full version of this content please select one of the options below:

Effect of PEG number on dielectric properties of paraffin‐based PEG polymers at microwave frequencies

Yoko Yamada Pittini (Swiss Federal Institute for Materials Research and Testing, EMPA, Thun, Switzerland)
Dana Daneshvari (Institute of Pharmaceutical Technology, Pharmacenter University of Basel, Basel, Switzerland)
Susanne Leparoux (Swiss Federal Institute for Materials Research and Testing, EMPA, Thun, Switzerland)
Sébastien Vaucher (Swiss Federal Institute for Materials Research and Testing, EMPA, Thun, Switzerland)
Axel Ritter (Swiss Federal Institute for Materials Research and Testing, EMPA, Thun, Switzerland)
Lukas Rohr (Swiss Federal Institute for Materials Research and Testing, EMPA, Thun, Switzerland)
Hans Leuenberger (Institute of Pharmaceutical Technology, Pharmacenter University of Basel, Basel, Switzerland and Institute for Innovation in Industrial Pharmacy, Pfeffingen, Switzerland)

Abstract

Purpose

To investigate the effect of poly ethylene glycol (PEG) chain length on the dielectric properties of paraffin‐based PEG polymers (H(CH2)n–(OCH2CH2)mOH) from both experimental and analytical approach.

Design/methodology/approach

Dielectric constant studies of paraffin‐based PEG polymers were carried out at temperatures above the melting point. The measurements were carried out at frequencies between 0.4 and 20 GHz. The number of PEG units, m, was varied from 0 to 80 to investigate the effect of the PEG chain length on the dielectric properties of the whole polymer.

Findings

With the existence of a dipole moment on PEG but not on pure paraffin, both the real and imaginary part of the dielectric permittivity become larger with increasing chain length of PEG. PEG 3000 showed the highest dielectric constants in the measured frequency range. The effect of the PEG chain length can be explained well by introducing the fraction of molecular weight of PEG divided by the molecular weight of the whole polymer (we call this fraction “Mw fraction of PEG”). Both, real and imaginary part of the dielectric permittivity exhibit a cubic dependence of the molecular weight fraction, and the loss tangent exhibits a linear dependence. These relationships make it possible to predict the microwave heating of the polymer in function of the PEG chain length, carbon chain length and microwave frequency.

Originality/value

For the dielectric permittivity of paraffin‐based PEG polymers, the effect of the PEG chain length, carbon chain length and applied microwave frequency on the loss tangent was explained well by introducing the molecular weight fraction of PEG.

Keywords

Citation

Yamada Pittini, Y., Daneshvari, D., Leparoux, S., Vaucher, S., Ritter, A., Rohr, L. and Leuenberger, H. (2008), "Effect of PEG number on dielectric properties of paraffin‐based PEG polymers at microwave frequencies", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 27 No. 2, pp. 500-508. https://doi.org/10.1108/03321640810847788

Publisher

:

Emerald Group Publishing Limited

Copyright © 2008, Emerald Group Publishing Limited

Related articles