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Author Popovici, D. ♦ Hulubei, C. ♦ Musteata, V.E. ♦ Bruma, M. ♦ Müller, A.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2010
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Polyimides ♦ Dielectric constant ♦ Plastics ♦ Films ♦ Thermal stability ♦ Temperature measurement
Abstract A series of polyimides (PI) based on two dianhydrides, namely 5-(2,5-dioxotetra-hydro-3-furanyl)-3-methyl-3-cyclohexene-1,2-dicarboxylicanhydride (DOCDA) and benzophenonetetracarboxylicdianhydride (BTDA), and an aliphatic diamine, namely 1,6 diaminohexane (DAH), have been obtained by solution polycondensation reaction, followed by thermal ring closure of the resulting polyamic acids. The chemical structures were identified by infrared and $^{1}H-NMR$ spectroscopy and their thermal and electrical properties (dielectric constant and dielectric loss at different frequencies) were investigated. The polymers showed good thermal stability, with no significant weight loss up to 340°C, with 5% weight loss temperature in the range of 345–430°C and glass transition temperatures (Tg) between 122–190°C. The resulting polyimides gave flexible films by thermal imdization of poly (amic acid) precursors. The AFM analysis revealed a smooth topography of their surfaces, with root-mean-square (Sq) roughness between 0.42–6.32 nm and average roughness (Sa) in the range of 0.33–2.39 nm. The dielectric constants of the PI films varied between 3.05 and 2.68 at 1 MHz frequency. The correlation between the polymers structure and their properties has been discussed.
Description Author affiliation: IMT Bucharest, Erou Iancu Nicolae Street, 126 A, Romania (Müller, A.) || “Petru Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41 A, Iasi, Romania (Popovici, D.; Hulubei, C.; Musteata, V.E.; Bruma, M.)
ISBN 9781424457830
ISSN 1545827X
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2010-10-11
Publisher Place Romania
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
e-ISBN 9781424457823
Size (in Bytes) 808.29 kB
Page Count 4
Starting Page 333
Ending Page 336


Source: IEEE Xplore Digital Library