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The dielectric relaxation behavior of semi crystalline poly(tetrahydrofuran) networks
Materials Science: an Indian journal • 2008
Publication Information
Authors
A.A.F.Zikry, M.T.El-Hefnawy, H.M.A.Ahmed, M.A.Sharaf
Keywords
dielectric, relaxation, crystallization, poly tetra hydro furan
Journal
Materials Science: an Indian journal
Publisher
Not Available
Volume
4
Issue
3
Pages
230-235
publication.type
International
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
The dielectric relaxation behavior of hydroxyl-terminated poly tetrahydrofuran (HO-PTHF-OH) network has been
investigated.The networks were prepared by a hydrolysis condensation process of the 3-isocyanato
propyltriethoxysilane end capped-oligmers for the crystalline relaxation covering a range in the temperature and
frequency. Also, the crystallization process of the investigated sample has been studied dielectrically as a function
of time and temperature. Furthermore, the results obtained showed that (i) the optimum crystallization tem- perature is about 25
0C; (ii) the time at which crystallization starts is a function of the working temperatures and
apparently isreduced to just a few minutes at 30
0C; and (iii) the crystallization processis completed within a period
of less than 1 hrs in the temperature range 20-30
0C.
investigated.The networks were prepared by a hydrolysis condensation process of the 3-isocyanato
propyltriethoxysilane end capped-oligmers for the crystalline relaxation covering a range in the temperature and
frequency. Also, the crystallization process of the investigated sample has been studied dielectrically as a function
of time and temperature. Furthermore, the results obtained showed that (i) the optimum crystallization tem- perature is about 25
0C; (ii) the time at which crystallization starts is a function of the working temperatures and
apparently isreduced to just a few minutes at 30
0C; and (iii) the crystallization processis completed within a period
of less than 1 hrs in the temperature range 20-30
0C.