Thermal and electrical properties of polyimide/PANI nanofiber composites prepared via in situ polymerization

The morphology, crystallinity, and mechanical properties of polyethylene (PE) composites containing 0, 3.5, 7, 10.5, and 14 wt% polyamide 6 (PA6) and graphene oxide (GO)/PA6 electrospun mats were investigated. The differential scanning calorimetry (DSC) and wide angle X-ray diffraction analysis results showed the formation of ɣ crystals in PA6 nanofibers where it increased with the addition of GO nanoplates. The crystallinity of PA6 mats was smaller than that of PA6 granule, but increased with the addition of GO. GO nanoplates at 2.5 wt% introduced a second higher melting peak 237 C for PA6 nanofiber. The DSC results showed that the crystallinity behavior of PE was affected by the presence of the nanofibers and GO nanoplates due to their nucleation effect. The mats enhanced the elastic modulus and yield strength of PE by 121 and 33%, respectively. Although ductility was dropped, the yield phenomenon of PE was preserved with the addition of the nanofibers. The nanofiber bridging mechanism was observed in the composites after failure in tensile test. The PE/PA6 nanocomposites can be used in PE applications with improved mechanical/barrier/conductivity properties such as tanks, containers, pipes, ropes, packaging, greenhouse films, and so on specially for those, which color change, or antistatic properties are important.

Section: Introductionmentioning

confidence: 99%

Electrospun polyamide/graphene oxide nanofibers as fillers for polyethylene: Preparation and characterization

Bateni

Motlagh

2021

“…However, adding fillers can suppress or delay the temperature at which DC conductance occurs. The dependence of DC conductivity on temperature conforms to the Arrhenius equation 3 53 :…”

Section: Dielectric Relaxation Process Of Pmps Compositesmentioning

confidence: 70%

Dielectric properties and dielectric relaxation process of polymethylphenylsiloxane/silicon dioxide nanocomposites

Zhao

Huang

et al. 2022

In recent years, polysiloxane dielectric elastomers (DEs) have attracted extensive attention, but their low dielectric constant and electrical breakdown strength are the main factors that limit their wide application. In this work, we report the effects that a high content of hydrophobic silica has on the dielectric properties and dielectric relaxation behavior of polymethylphenylsiloxane (PMPS). Introducing a high content of hydrophobic silica into PMPS composites increased the dielectric constant of PMPS composites from 3.11 to 3.70 and the breakdown strength of PMPS composites from 35.31 to 42.66 kv/mm. The high content of

“…In addition, the peaks observed at 914 and 1040 cm −1 are ascribed to the AlOH and SiO stretching vibrations, respectively. After the growth of PANI nanolayers, the three characteristic peaks of the PANI/clay nanocomposites at 1300, 1481, and 1568 cm −1 are attributed to the CN + stretching of secondary aromatic amines and the C═C stretching of the benzenoid and quinoid structures, respectively 36–38 . According to the literature, 39,40 the state of the intercalation and exfoliation of polymer/clay nanocomposites can be determined via changes in the clay band region (1350–750 cm −1 ).…”

Section: Resultsmentioning

confidence: 99%

Anticorrosion performance of polyaniline/clay nanocomposites in epoxy coatings

Kang

Wang

Chen

2022

Thickness-tunable triple-layer polyaniline (PANI)/clay nanocomposites were synthesized via in situ intercalative polymerization of PANI within the clay layers. The PANI/clay nanocomposites were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. In this study, the thickness of the PANI/clay nanocomposites was easily controlled by adjusting the proportions of PANI and pristine clay. Based on oxygen transmission rate measurements, the oxygen barrier properties of pristine clay can be enhanced by the growth of PANI. Notably, the oxygen barrier property of epoxy loaded PANI/clay nanocomposites was linearly dependent on the PANI growth thickness. After 30 days immersion electrochemical impedance spectroscopy test under saline conditions, the resistance (R c ) of the pure epoxy coating (2.47 Â 10 6 Ω) increased to 5.76 Â 10 10 Ω when 1 wt.% PANI was added to the epoxy coating. However, when 1 wt.% PANI/clay was added into the epoxy coating, the R c of the composite coating increased further to 7.66 Â 10 11 Ω. Notably, the ratio of PANI to PANI/clay was only 36.5 wt.%, indicating synergistic anticorrosion properties can be obtained by the intercalation of PANI/clay additives. Therefore, PANI/clay nanocomposites have a high potential as anticorrosion additives for industrial epoxy resin coatings.