Dielectric relaxation mechanisms in polyoxymethylene/polyurethane/layered silicates hybrid nanocomposites

Abstract

Polyoxymethylene/Polyurethane/Layered Silicates (POM/PU/LS) ternary hybrid nanocomposites were prepared by two methods: (a) direct melt compounding (DM) and (b) melt compounding using a latex-mediated masterbatch (MB) technique. The morphology of the produced specimens and the quality of the dispersion of LS (synthetic sodium fluorohectorite) were examined via Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM). Broadband dielectric spectroscopy (BDS) was employed in order to study the dielectric response of the two systems in a wide frequency and temperature range. Rich dielectric spectra are recorded, since dielectric relaxation mechanisms originate from POM matrix, PU latex as well as from interfacial phenomena between LS and the polymer matrix. Six different mechanisms were observed in the spectra of the examined

Comparative analysis of the structural, optical, mechanical, and electrical properties of PMMA/PU blend‐based nanocomposites with FeVO4 nanofiller for energy storage devices

“…universality law” may be used to characterize the typical behavior of AC conductivity in disordered solids and polymeric materials at low frequencies. The hopping mechanism has been described and studied as a possible explanation for this kind of behavior 35 . FeVO 4 ‐PU/PMMA systems had substantially greater conductivity values, which were generally changed by the addition of FeVO 4 , which restored the conductivity's ability 21 .…”

“…The hopping mechanism has been described and studied as a possible explanation for this kind of behavior. 35 FeVO 4 -PU/PMMA systems had substantially greater conductivity values, which were generally changed by the addition of FeVO 4 , which restored the conductivity's ability. 21 This trend suggests that the dopant molecules begin to bridge the gap as the dopant concentration rises.…”

Polyoxymethylene/silica/polylactic acid-grafted polyethylene glycol nanocomposites: structure, morphology, and mechanical properties and ozone and UV durability

“…[4][5][6][7][8][9] The presence of such additives can also improve the mechanical properties and thermal stability of POM. Various nanollers have been examined for the preparation of POMbased nanocomposites, including nanosilica (NS), [4][5][6] carbon nanotubes, 7-9 montmorillonite, [10][11][12][13][14] CaCO 3 , 15 graphite, 16 Al 2 O 3 , 17 ZnO, 18 hydroxyapatite, 19,20 boehmite alumina, 14,21 polyhedral oligomeric silsesquioxane, 22,23 and NS and carbon bers. 24 POM can also been combined with ethylene-octene copolymer to improve the relaxation properties of POM.…”

Effect of Silver Nanoparticles on the Melting Behavior, Isothermal Crystallization Kinetics and Morphology of Polyoxymethylene

“…On the other hand, the crystallization behavior of POM depends on its supramolecular structure [11,12]. However, POM has a linear molecular chains as (-CH 2 -O-) n structure which leads to high crystallinity, which limits its application [13][14][15]. Therefore, many studies have reported on the effect of additives on the crystallization performance of POM [16].…”