Thermal and dielectric behavior of polyamide-6/clay nanocomposites

Impact of nanoclay loading on the structural, thermal and dielectric properties of montmorillonite/polypropylene nanocomposites

“…This result is in agreement with those of Laredo et al [31] and shows the similarity of these two relaxation processes. Same results were found by Hammami et al [18] in the case of PA6/MMT nanocomposites. In addition, these findings support the increase in T g following the nanoclays addition.…”

“…This increase indicates the development of new crystal nuclei due to the existence of Cloisite 20A montmorillonite. [18][19][20][21] Moreover, the rise in the glass-rubbery transition temperature of PCNs compared to pure PP is explained by the fact that in the PP/Cloisite interfacial region, there is a decrease in the mobility of the macromolecular polymer chains due to their interactions with MMT reinforcement. [19,20] 3.3 | Dielectric spectroscopy…”

“…This relaxation is observed at temperatures above the glass transition temperature and generally related to the segmental movement of the crystalline phases of the PP matrix or the intermediate zone between the amorphous and crystalline phases of PP called the rigid amorphous fraction (RAF). [18,22] In our previous work, a model was developed to distinguish the crystalline, the rigid amorphous and the mobile amorphous fractions from the heat capacity measurements of the glass transition zone using the temperature modulated differential scanning calorimetry (TMDSC) technique in the case of polyamide-PA6/MMT nanocomposites. [18] The results obtained showed that the rigid amorphous fraction increased as a function of the clay content and dispersion within the sample.…”

Thermally improved crystalline phase and intercalated PEO/OMMT nanocomposites for high to ultrahigh radio frequency range low‐permittivity nanodielectrics

“…5,6,[9][10][11] In addition to the alterations in chemical and thermomechanical properties of the PNCs, it is also observed that the dielectric and electrical properties of nanoclay loaded polymer matrices are largely affected by the intercalated/exfoliated clay structures. 4,7,12,13,[16][17][18][19][20][21] However, most of the dielectric studies on the clay containing PNCs were performed with externally applied electric field starting from frequency of a few millihertz or hertz and extending up to some megahertz. It is because of the fact that the interfacial polarization largely contributes to the dielectric permittivity in all types of hybrid nanocomposites at lower frequencies which is imperative for exploring their nanodielectric applications in low-frequency device technologies.…”

“…It is because of the fact that the interfacial polarization largely contributes to the dielectric permittivity in all types of hybrid nanocomposites at lower frequencies which is imperative for exploring their nanodielectric applications in low-frequency device technologies. 4,13,[16][17][18][19][20][21][22][23][24][25][26] However, dielectric properties of PNCs in the high to ultrahigh frequency range of harmonic electric field are less attempted due to several complex measurement protocols, although, the dielectric parameters in this range are in high industrial demand in order to select appropriate composite materials in developing promising radio-electronic devices and other technological uses. [27][28][29][30][31][32][33] Thus, in this manuscript, we report the dielectric dispersion behavior and alternating current (AC) electrical conductivity of the PEO/OMMT nanocomposites in the radio frequency range of 1 MHz-1 GHz, and also the OMMT structural properties and thermal behavior of PEO crystallites.…”