The effect of fluorosilicone modifiers on the carbon nanotube networks in epoxy matrix

The graphene nanofiller (2 wt%) was dispersed in poly(methyl methacrylate) by in situ polymerization method. The optimum high frequency (microwave) absorption was evaluated at X‐band due to changes in the scattering parameters (determined by using a vector network analyzer). The slight improvement has been attained in gamma attenuation coefficient of the polymer nanocomposite by using gamma transmission technique. The addition of graphene nanoplatelets (2 wt%) resulted in a thermal improvement from 196.73 to 243.00°C (with 5% weight loss) in TGA analysis. The graphene nanoplatelets provided an optimum decrease in scattering of the microwaves due to the elimination of the defects and the prevention of the agglomeration of the graphene nanoplates. The improvement of microwave absorption (between 8 and 12 GHz) suggested that the nanocomposite was a suitable candidate as a microwave absorbing material. This multipurpose nanocomposite has provided thermal stability and it has ensured the optimum gamma‐ray and microwave absorption depending on the development of the structural properties. The development of these physical characteristics has enabled to improve the electrical conductivity as a result of the progress in the structural properties.

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 85%

Improvement of thermal stability and gamma‐ray absorption in microwave absorbable poly(methyl methacrylate)/graphene nanoplatelets nanocomposite

Bel

Muhammettursun

Kocacinar

et al. 2021

“…It is well known that the strong agglomerating tendency of the tubes and their high surface area lead to agglomeration of the particles in polymer matrices, which limits their practical applications. [17][18][19][20][21][22] To overcome the agglomeration issues, the use of a thin CNT film prepared from a randomly distributed CNT suspension filtrated through a membrane under vacuum conditions has been used by several researches. 18,23,24 The structure is thought of as a CNT skeleton, also known as Buckypaper (BP).…”

mentioning

confidence: 99%

Morphological, mechanical, and electromagnetic interference shielding effectiveness characteristics of glass fiber/epoxy resin/MWCNT buckypaper composites

Corredor

Santos

Botelho

et al. 2021

Glass fiber/epoxy resin composites (GF/EP) using one and three multi-walled carbon nanotube buckypapers (BP) were obtained and their complex parameters, reflectivity, and electromagnetic interference (EMI) shielding effectiveness (SE) at X-band (8.2-12.4 GHz) and Ku-band (12.4-18 GHz) were evaluated. The preparation of BP used polyacrylonitrile (PAN) nanofibers (PF These composites show both large storage and energy loss capacity in both bands revealing promising results related to EMI SE applications. Besides, a high attenuation of around 67% and 72% were achieved for BP based composites. The cross-section view of the buckypaper and the laminates was analyzed by scanning electron microscopy (SEM). The incorporation of the CNT film into the laminates showed no improvements in the elastic properties through dynamic mechanical analyses (DMA). Nevertheless, a decrease in the shear properties by the compression shear test (CST) and interlaminar shear strength (ILSS) has been observed. GF/EP/BP/PF composite presented a reduction of 29 and 39% in its ILSS properties compared to the base laminate (GF/EP). Also, the decrease was even more significant, revealing a steep reduction in its CST properties. On the other hand, the removal of the pan nanofiber (PF) led to better mechanical properties for GF/EP/BP/RPF composites. Results have shown ILSS values of 47.4 ± 2.2 MPa which are close to the base laminate (52.4 ± 3.1 MPa). The removal of the PF provided larger porous in the CNT network, making the impregnation by epoxy easier in the BP/RPF which resulted in improved shear properties compared to GF/EP/BP/PF samples. K E Y W O R D S composites, graphene, and fullerenes, mechanical properties, nanotubes, thermosets 1 | INTRODUCTION Nowadays, materials with properties of reflectivity and electromagnetic interference (EMI) shielding effectiveness (SE) have attracted intensive attention in aerospace, engineering, and telecommunication areas, all with civil and military applications. 1-6 Carbon nanomaterials such as carbon nanotubes (CNT), carbon nanofibers, graphite nanoplatelets, and carbon black 3,7-12 are good candidates for developing composites that attend the technological

“…In this milieu, conducting polymers like polyaniline nanofiber (PN), polypyrrole, polythiophene, and their derivatives are mostly utilized as anticorrosive agents . Among these PN is the oldest and most widely utilized anticorrosive material due to its well‐regulated conductivity, high stability, and easy fabrication . The mechanism of corrosion protection by PN has been studied by different researchers.…”

Section: Introductionmentioning

confidence: 99%

Bio‐based epoxy/polyaniline nanofiber‐carbon dot nanocomposites as advanced anticorrosive materials

Saikia

Sarmah

Kumar

et al. 2019

Application of anticorrosive coating on metal surface enhances the durability of the metal. Anticorrosion can be achieved by the incorporation of conducting nanomaterials like polyaniline or its nanohybrid to a coating material. Thus, bio‐based epoxy nanocomposites were fabricated by the in situ method using polyaniline nanofiber‐carbon dot nanohybrid (0.50 and 1 wt % with respect to epoxy), as the anticorrosive material. The epoxy resin was obtained by polycondensation of bisphenol‐A, sorbitol, and monoglyceride of castor oil (mole ratio of 16:3:1), as hydroxyl compounds with epichlorohydrin (1:3 equivalent, hydroxyl:epichlorohydrin). The morphological analyses of the nanocomposites revealed the uniform dispersion and good compatibility of the nanohybrid in the epoxy matrix. The thermosets demonstrated good tensile strength (30 MPa), elongation at break (45%), scratch resistance (>10 kg) and impact resistance (14.75 kJ/m), good thermal stability (above 250°C), and chemical resistance. The anticorrosion study of the nanocomposites showed excellent corrosion protection efficiency (corrosion rate: 5.68 × 10−3 mils per year) in 3.5 wt % NaCl compared to the pristine epoxy system. Therefore, this bio‐based thermosetting epoxy nanocomposite was demonstrated as efficient anticorrosive material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47744.