Biodegradable Poly (lactic acid)/ Poly (ethylene glycol) Reinforced Multi-Walled Carbon Nanotube Nanocomposite Fabrication, Characterization, Properties, and Applications.

Ahmad Fahad Ahmad,Khamirul Amin Matori,Sidek Ab Aziz,Suzan Jabbar Obaiys,Umar Sa’As Aliyu,Kanagesan Samikannu,Mohd Hafiz Mohd Zaid

doi:10.3390/polym12020427

Ahmad Fahad Ahmad, Khamirul Amin Matori + Show 5 more

Open Access

https://doi.org/10.3390/polym12020427

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Abstract

This paper presents the electromagnetic interference properties of multi-walled carbon nanotubes (MWCNTs) as a novel nano-reinforcement filler in poly (lactic acid) (PLA)/poly (ethylene glycol) (PEG) polymer matrix that was prepared via melt blending mode. Plasticization of PLA was first carried out by PEG, which overcomes its brittleness problem, in order to enhance its flexibility. A waveguide adapter technique was used to measure the dielectric properties , and S-parameters reflection (S11) and transmission (S21) coefficients. The dielectric properties, microwave attenuation performances, and electromagnetic interference shielding effectiveness (EMISE) for all the material under test have been calculated over the full X-Band (8–12 GHz) due to its importance for military and commercial applications. The prepared samples were studied while using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transforms infrared spectroscopy (FTIR), mechanical properties measurements, as well as thermogravimetric analysis (TGA). The results showed that the dielectric properties increased with increased multi-walled carbon nanotubes (MWCNTs) filler, as well as the shielding effectiveness of the MWCNT/PLA/PEG nanocomposites increased with the increasing of MWCNTs. The highest SE total value was found to be 42.07 dB at 12 GHz for 4 wt.% filler content. It is also observed that the attenuation values of the nanocomposites increased with an increase in MWCNTs loading, as well as the power loss values for all of the samples increased with the increase in MWCNTs loading, except the amount of the transmitted wave through the nanocomposites.

Highlights

Electromagnetic interference (EMI) shielding is considered to be very important in today’s electronic components and devices [1], where these electronic devices are radiated and they are affected by electromagnetic interference (EMI)
X-ray diffraction (XRD) is used in the determination of the effect of the addition of multi-walled carbon nanotubes (MWCNTs) nanoparticle to amorphous poly(lactic acid) (PLA)/PEG materials
It was observed from the XRD result that the incorporation of the MWCNTs led to a gradual emergence of a new peak that increases in severity with and increase the MWCNTs loading

Summary

Introduction

Electromagnetic interference (EMI) shielding is considered to be very important in today’s electronic components and devices [1], where these electronic devices are radiated and they are affected by electromagnetic interference (EMI). It is required to control the level of their EMI emission, for product acceptance by complying with the standards of electromagnetic compatibility that agencies of government impose [2]. Conductive coatings, conductive polymer composites (CPCs), and foil laminates are the means of EMI shielding. The commonly used conducting fillers are carbon black, with the major disadvantage being the high amount of carbon black that is required up to 30–40% to achieve desired conductivity levels, which results in polymers’ mechanical properties deterioration [3,4]

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