Dielectric response of HDPE/clay nanocomposites containing 10%wt of organo-modified clay

David, Éric; Zazoum, Bouchaib; Fréchette, M.F.; Rogti, F.

doi:10.1109/ceidp.2015.7352149

Cited by 3 publications

(2 citation statements)

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“…The role of compatibilizer is to improve the level of dispersion of clay with the help of the polar interactions between the maleic anhydride groups in the compatibilizer and the hydroxyl groups of clay as was confirmed by the broader diffraction peak in XRD patterns . A similar trend has been reported previously . This improvement of the dispersion level increases the interfaces of nanofiller with the polymer matrix resulting in more interfacial chain cooperativity and hence longer relaxation times.…”

Section: Resultssupporting

confidence: 77%

“…Water would constitute a conductive layer leading to an interfacial relaxation observable usually in the intermediate frequencies, which can also influence the dipolar relaxation dynamics . The water effect, however, was shown to be negligible for several reasons: the organomodified clay is believed to have a high hydrophobicity level , the polymeric constituents of the blend matrix are apolar, and there are reports that no significant impact of water was observed on dielectric properties of nanocomposites containing modified clay‐based separately on polyethylene and SEBS .…”

Section: Resultsmentioning

confidence: 99%

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Dielectric Relaxation Dynamics of Clay‐Containing Low‐Density polyethylene Blends and Nanocomposites

Eesaee

David

Demarquette

2020

Polymer Engineering & Sci

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Series of clay-containing nanocomposites have been prepared and investigated using frequency-domain dielectric spectroscopy at different temperatures. Different matrix materials have been used: neat low-density polyethylene (LDPE) with and without compatibilizer and co-continuous blends of LDPE with two grades of polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS) copolymers. Two major relaxation modes were detected in the dielectric losses of all the nanocomposites and associated with Maxwell-Wagner-Sillars interfacial polarization and dipolar relaxation, respectively. Characteristic relaxation rates, activation energies, dielectric strength, and shape parameters of these relaxation mechanismes were calculated and discussed for the LDPE/clay nanocomposites. The addition of compatibilizer was found to slightly increase the dielectric loss of the nanocomposites while slowing the dynamics due to an improved dispersion. When combined with a high loading of nanofiller (15%), the compatibilizer addition led to lowfrequency dispersion. A new relaxation process was then observed for the nanocomposites with the blend matrix. Several speculations were made as to the origin of this phenomenon, all of which were related to the SEBS phase. POLYM. ENG. SCI., 60:968-978, 2020.

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Section: Resultssupporting

confidence: 77%