NDLI: Dielectric properties of PA6 — Montmorillonite nanocomposites under moderate electric field

Content Provider	IEEE Xplore Digital Library
Author	Couderc, H. Frechette, M. David, E. Savoie, S.
Copyright Year	2013
Description	Author affiliation: Hydro-Quebec's Res. Inst., Varennes, QC, Canada (Frechette, M.; Savoie, S.) \|\| Ecole de Technol. Super., Montreal, QC, Canada (Couderc, H.; David, E.)
Abstract	Polyamide 6 (PA6) nanocomposite samples were prepared by in-situ polymerisation. A neat PA6 sample and samples containing 2 and 4% of Montmorillonite were obtained. The samples were studied by Differential Scanning Calorimetry and Broadband Dielectric Spectroscopy. Glass transition temperature was found to increase of 4K for the sample containing 4% of nanofiller whereas the sample containing 2% showed no variation. The heat capacity step is strongly modified by the addition of 2% of Montmorillonite but not by 4%. This suggests that in the sample with 4% of Montmorillonite the molecule movements are impeded by the Montmorillonite sheets. The DSC curves also exhibit a secondary glass transition for the nanocomposites, related to the molecules intercalated between MMT sheets. Broadband dielectric spectroscopy experiments were conducted on all samples at electrical fields around 100 V/mm. The α relaxation process, related to glass transition molecular movements, is observable. The dielectric spectra were studied on as-received and dried samples. The variations of the relaxation times with temperature were extracted from the spectra by fitting with Havriliak-Negami equation. The influence of water and electric field were put in evidence. The presence of nanoclay was found to impede the molecular movements whereas water had a plasticizing effect. The superimposition of these two influences was observable on “as received” samples.
Sponsorship	IEEE Dielectr. Electr. Insul. Soc.
Starting Page	291
Ending Page	294
File Size	288979
Page Count	4
File Format	PDF
ISBN	9781467347389
e-ISBN	9781467347440
e-ISBN	9781467347396
DOI	10.1109/EIC.2013.6554252
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-02
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Dielectrics Nanocomposites Glass Heating Temperature measurement Polymers Spectroscopy Broadband Dielectric Spectroscopy Montmorillonite Differential Scanning Calorimetry
Content Type	Text
Resource Type	Article

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