1. Molecular dynamics of poly([epsilon]-cap-caprolactone)/beidellite organoclay bionanocomposites obtained by in-situ polymerization highlighted by dielectric relaxation spectroscopy
- Author
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Ezzeddine, Imene, Ilsouk, Mohamed, Arous, Mourad, Atlas, Salima, Lahcini, Mohammed, and Raihane, Mustapha
- Subjects
Molecular dynamics -- Electric properties -- Analysis ,Polymerization -- Electric properties -- Analysis ,Electrical conductivity -- Analysis -- Electric properties ,Broadband transmission -- Electric properties -- Analysis ,Activation energy -- Electric properties -- Analysis ,Dielectrics -- Analysis -- Electric properties ,Capacitors -- Electric properties -- Analysis ,Spectrum analysis -- Electric properties -- Analysis ,Broadband Internet ,Engineering and manufacturing industries ,Science and technology - Abstract
Nanocomposites of poly([epsilon]-caprolactone) (PCL) reinforced by an organomodified beidellite (BDT) with 3% of cetyltrimethylammonium bromide (CTAB) (labeled PCL/3CTA-BDT) were prepared by varying the content of filler (1, 2, 3, and 5 wt%). Their molecular dynamics were investigated by broadband dielectric spectroscopy at temperatures ranging from 0 to 40[degrees]C and a frequency window from [10.sup.-1] to [10.sup.6] Hz. Three relaxation processes were detected for unfilled PCL: electrode polarization (EP), the Maxwell-Wagner-Sillars (MWS) polarization, and the a-relaxation. The incorporation of the filler induced the emergence of a fourth process at high frequency of dipolar origin labeled as interfacial polarization (IP). Fitting the data with the Havriliak-Negami model as well as a study of the relaxation time variation with temperature demonstrated the noncooperative nature of the IP process. Activation energy and dielectric strength values demonstrated that the PCL/3CTA-BDT with 3 wt% of filler showed a higher quality of dispersion and better interfacial features compared to those with other filler contents (2 and 5 wt%). This work highlights the challenges of dielectric green nanocomposites used for capacitors (storage energy) and cable/wire insulation. Highlights * The various samples were analyzed using broadband dielectric spectroscopy. * Relaxation processes in pure matrix: EP, MWS, and a-relaxation. * Incorporation of the filler induced the emergence of interfacial polarization (IP). * Noncooperative behavior of the IP process. * 3 wt% loading showed a higher quality of dispersion and interfacial features. KEYWORDS activation energy, adsorption, dielectric properties, interfaces, nanocomposites, 1 | INTRODUCTION Petrochemical-based synthetic polymers have significantly benefited various areas of human life, including packaging and agricultural applications. Over the years, global plastics production has experienced exponential growth, reaching [...]
- Published
- 2024
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