Thermal stability of the shielding effectiveness of composites to electromagnetic interference. Effects of matrix polymers and surface treatment of fillers

1992 ◽  
Vol 35 (1) ◽  
pp. 33-43 ◽  
Author(s):  
Zenjiro Osawa ◽  
Satoshi Kuwabara
Keyword(s):  
Thermal Stability ◽  
Surface Treatment ◽  
Electromagnetic Interference ◽  
Interference Effects ◽  
Shielding Effectiveness ◽  
Thermal Stability Of

Electromagnetic interference shielding effectiveness of polypyrrole-silver nanocomposite films on silane-modified flexible sheet

2021 ◽  
pp. 095400832110645
Author(s):  
Karim Benzaoui ◽  
Achour Ales ◽  
Ahmed Mekki ◽  
Abdelhalim Zaoui ◽  
Boudjemaa Bouaouina ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Electromagnetic Interference ◽  
Nanocomposite Films ◽  
Electrical Characteristics ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Electromagnetic Interference Shielding ◽  
Silver Nanocomposite ◽  
Electromagnetic Interference Shielding Effectiveness ◽  
Emi Se

The conventional electromagnetic interference (EMI) shielding materials are being gradually replaced by a new generation of supported conducting polymer composites (CPC) films due to their many advantages. This work presents a contribution on the effects of silane surface–modified flexible polypyrrole-silver nanocomposite films on the electromagnetic interference shielding effectiveness (EMI-SE). Thus, the UV-polymerization was used to in-situ deposit the PPy-Ag on the biaxial oriented polyethylene terephthalate (BOPET) flexible substrates whose surfaces were treated by 3-aminopropyltrimethoxysilane (APTMS). X-ray Photoelectron Spectroscopy (XPS) analyzes confirmed the APTMS grafting procedure. Structural, morphological, thermal, and electrical characteristics of the prepared films were correlated to the effect of substrate surface treatment. Thereafter, EMI-SE measurements of the elaborated films were carried out as per ASTM D4935 standard for a wide frequency band extending from 50 MHz to 18 GHz. The obtained results confirmed that the APTMS-treated BOPET film exhibit higher EMI shielding performance and better electrical characteristics compared to the untreated film. In fact, a 32% enhancement of EMI-SE was noted for the treated films compared to the untreated ones. Overall, these results put forward the role played by the surface treatment in strengthening the position of flexible PPy-Ag supported films as high-performance materials in electronic devices and electromagnetic interference shielding applications.

A Study of Thermal Stability and Electromaganetic Shielding Behavior of Polyaniline-P-Toluene Sulfonic Acid/Montmorillonite Nanocomposites

2011 ◽  
Vol 52-54 ◽  
pp. 180-185 ◽  
Author(s):  
Ming Kuen Chang ◽  
Hsin Hong Hsieh ◽  
Siou Jyuan Li
Keyword(s):  
Thermal Stability ◽  
Electromagnetic Interference ◽  
Conductive Polymer ◽  
Layered Silicate ◽  
Electromagnetic Shielding ◽  
Environmental Stability ◽  
Shielding Effectiveness ◽  
Increase With Increase ◽  
Toluene Sulfonic Acid ◽  
Wide Range

Intrinsically conductive polymer-Polyaniline had high conductivity and many other properties, such as environmental stability and rather simple synthesis. In addition, doping with organic acids could enhance its processing, so it had wide range of applications, such as solar cells, antistatic and electromagnetic interference shielding. In this study, the organic amine 1-Dodecylamine (DOA) modification of sodium montmorillonite (NA+-MMT), and conducting polymer / layered silicate salt nanocomposites (PANI-PTSA/DOA-MMT) had been prepared by doping aniline with organic acid (PTSA), then added organic clay. The thermal, electrical properties and EMI effects of nanocomposites had discussed by XRD, TEM, EMI, TGA analysis, conduction measure and EMI tested. The results indicated the organo-clay interlayer distance expanded from 1.29 to 1.8 nm, and DOA-MMT dispersed in the material, that formed an exfoliated nanocomposite. The thermal stability of nanocomposites depended on content of DOA-MMT, material had the better thermal stability when DOA-MMT load was 5 wt. %. The nanocomposites had the best conductivity when DOA-MMT load was 1 wt. % as well as the electromagnetic shielding effectiveness was increase with increase in conductivity. In addition, the electromagnetic shielding of nanocomposites also depended on thickness and frequency of electromagnetic wave, the electromagnetic shielding was increased with increase in thickness and frequency.

scholarly journals Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO2 and hBN fillers

2019 ◽  
Vol 6 (10) ◽  
pp. 105350
Author(s):  
Dayuan Qiang ◽  
Xinyu Wang ◽  
Yan Wang ◽  
Thomas Andritsch ◽  
George Chen
Keyword(s):  
Thermal Stability ◽  
Surface Treatment ◽  
Epoxy Nanocomposites ◽  
Nano Sio2 ◽  
Thermal Stability Of

scholarly journals Comparison of the thermal stability of magnesium phosphate (newberyite) coating with conventional zinc phosphate (hopeite) coating

2018 ◽  
Vol 62 (4) ◽  
pp. 129-133
Author(s):  
P. Pokorný
Keyword(s):  
Thermal Stability ◽  
Surface Treatment ◽  
Zinc Phosphate ◽  
Magnesium Phosphate ◽  
Manganese Phosphate ◽  
Thermal Stability Of ◽  
Start Temperature ◽  
Conventional Coating

Abstract This article presents a detail comparison of the thermal stability of the new magnesium phosphate (newberyite – MgHPO4·3H2O) coating with a conventional coating of zinc phosphate (hopeite – Zn3(PO4)2·4H2O). It was confirmed that dehydration of zinc phosphate (hopeite) occurs gradually (dehydration start temperature: 115 °C). The start of magnesium phosphate (newberyite) dehydration is indeed shifted to somewhat higher temperatures (about 125 °C) but the dehydration has an intense jump character. When using magnesium phosphate (newberyite) coating for further surface treatment at higher temperatures, dehydration of the coating can result in reduction of the adhesion between the phosphate/primer coatings. Under these conditions, it is recommended to use a coating of conventional zinc phosphate (hopeite) or manganese phosphate (hurealite).

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