Poly(ethylene terephthalate)/exfoliated graphite nanocomposites with improved thermal stability, mechanical and electrical properties

Li, Meilu; Jeong, Young Gyu

doi:10.1016/j.compositesa.2011.01.015

Cited by 89 publications

(78 citation statements)

References 26 publications

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“…Therefore, FTIR technique was used in the current study to identify the functional groups attached to the surface of GNP during exfoliation techniques (Figure 2). This result is in agreement with those obtained by Li and Jeong [8] who reported some functional groups on the surface of the GNP used. However, a good attraction can occur between the ester groups (-C=O) of PET (see Figure 3) and functional groups such as hydroxyls acids (-OH) on the surface of GNP which leads to improvements in the desperation state of these nanoparticles.…”

Section: Electrical Conductivity and Percolation Threshold Measurementssupporting

confidence: 83%

“…Similar morphologies for GNP were observed in previous studies [8,22,23]. On the other hand, Figures 5, 6, and 7 show the PET-GNP nanocomposites at 2, 6, and 8 wt.% of GNP loading.…”

Section: Morphological Characterizationsupporting

confidence: 70%

“…A homogenous dispersion of GNP in the PET matrix was noted in this study after some shearing has been used to improve interaction between PET matrix and GNP. Similar work done by Li and Jeong, [8] who prepared PET nanocomposites with diverse concentrations of GNP using melt mixing method, reported good dispersed GNP within the PET matrix, leading to improvements in the mechanical, electrical, and thermal properties of nanocomposites compared with the unfilled PET. The electrical percolation threshold was found to be ∼5 wt.% Al-Jabareen et al [13] added GNP into PET by melt mixing to enhance its oxygen barrier properties.…”

Section: Introductionmentioning

confidence: 72%

“…For example, Zhang et al [4] obtained a Φ at 3.4 vol.% of expanded graphite (∼6 wt.%) for PET-expanded graphite nanocomposites using melt-compounding technique. Moreover, Li and Jeong [8] used the same preparation method and reported that the electrical conductive path of exfoliated graphite in the PET matrix was developed at about 5 wt.% of exfoliation graphite filler. These studies reported that there are some functional groups on the surface of the GNP fillers.…”

Section: Electrical Conductivity and Percolation Threshold Measurementsmentioning

confidence: 99%

“…Despite the above-stated properties, improvement of its electrical conductivity is necessary for electronic applications [8], for example, replacing of indium tin oxide (ITO) electrodes as these materials have poor mechanical and lower conductivity when compared to the conductive carbon nanofillers such as graphene nanoplatelets or carbon nanotubes [2]. The electrical conductivity values higher than 10 −8 S/m are required for numerous electronic applications, for instance, semiconducting, antistatic, and electromagnetic shielding materials for electronic devices [9].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Electrical, Thermal, and Morphological Properties of Poly(ethylene terephthalate)-Graphite Nanoplatelets Nanocomposites

Alshammari

Wilkinson²,

Almutairi

2017

International Journal of Polymer Science

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Graphite nanoplatelets (GNP) were incorporated with poly(ethylene terephthalate) (PET) matrix by melt-compounding technique using minilab compounder to produce PET-GNP nanocomposites, and then the extruded nanocomposites were compressed using compression molding to obtain films of 1 mm thickness. Percolation threshold value was determined using percolation theory. The electrical conductivity, morphology, and thermal behaviors of these nanocomposites were investigated at different contents of GNP, that is, below, around, and above its percolation threshold value. The results demonstrated that the addition of GNP at loading >5 wt.% made electrically conductive nanocomposites. An excellent electrical conductivity of ∼1 S/m was obtained at 15 wt.% of GNP loading. The nanocomposites showed a typical insulator-conductor transition with a percolation threshold value of 5.7 wt.% of GNP. In addition, increasing screw speed enhanced the conductivity of the nanocomposites above its threshold value by ∼2.5 orders of magnitude; this behavior is attributed to improved dispersion of these nanoparticles into the PET matrix. Microscopies results exhibited no indication of aggregations at 2 wt.% of GNP; however, some rolling up at 6 wt.% of GNP contents was observed, indicating that a conductive network has been formed, whereas more agglomeration and rolling up could be seen as the GNP content is increased in the PET matrix. These agglomerations reduced their aspect ratio and then reduced their reinforcement efficiency. NP loading (>2 wt.%) increased degree of crystallinity and improved thermal stability of matrix slightly, suggesting that 2 wt.% of GNP is more than enough to nucleate the matrix.

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Section: Electrical Conductivity and Percolation Threshold Measurementssupporting

confidence: 83%

“…Similar morphologies for GNP were observed in previous studies [8,22,23]. On the other hand, Figures 5, 6, and 7 show the PET-GNP nanocomposites at 2, 6, and 8 wt.% of GNP loading.…”

Section: Morphological Characterizationsupporting

confidence: 70%