Low Percolation Threshold in Nanocomposites Based on Oxidized Single Wall Carbon Nanotubes and Poly(butylene terephthalate)

Nogales, Aurora; Broza, G.; Rosłaniec, Z.; Schulte, Karl; Sics, Igor; Hsiao, Benjamin S.; Sanz, Alejandro; García-Gutiérrez, Mari Cruz; Rueda, Daniel R.; Domingo, Concepción; Ezquerra, Tiberio A.

doi:10.1021/ma049440r

Cited by 204 publications

(138 citation statements)

References 22 publications

(63 reference statements)

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“…Although carbon black is traditionally used as the conductive filler, the small diameter and the large aspect ratio of SWNTs has enabled achievement of very low percolation threshold concentrations, depending on the quality of their dispersion. 13,49 Neat PET is an excellent insulating material and had a conductivity value of the order of 10-17 S 145 cm . The room temperature dc electrical conduc tivity values of our PET-SWNT nanocomposite samples are shown in Figure 4, and these indicate that SWNTs at concentrations >-2.0 wt % are indeed effective in imparting electrical conductivity when melt blended to the PET matrix.…”

Section: Electrical Conductivitymentioning

confidence: 99%

Carbon nanotubes‐reinforced PET nanocomposite by melt‐compounding

Anand

Agarwal

Joseph

2007

J of Applied Polymer Sci

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Poly(ethylene terephthalate) (PET) nanocomposites with single-walled carbon nanotubes (SWNTs) have been prepared by a simple melt compounding method. With increasing concentration (0-3 wt %) of SWNTs, the mechanical and dynamic mechanical properties improved, corresponding to effective reinforcement. Melt rheological characterization indicated the effective entanglements provided by SWNTs in the melt state as well. Thermogravimetric analysis suggested no influence of SWNTs on the thermal stability of PET. Electrical conductivity measurements on the composite films pointed out that the melt compounded SWNTs can result in electrical percolation albeit at concentrations exceeding 2 wt %.

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Section: Electrical Conductivitymentioning

confidence: 99%

Carbon nanotubes‐reinforced PET nanocomposite by melt‐compounding

Anand

Agarwal

Joseph

2007

J of Applied Polymer Sci

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“…However, in situ polymerization is a suitable method of obtaining well-dispersed nanofiller in the PET matrix [17,18]. The intense dispersion process by ultrasonication and high speed stirring of CNTs in liquid monomer (1,4-butanediol) and subsequent in situ polycondensation enabled to receive PBT/SWCNT (single-walled CNT) nanocomposites in which the percolation threshold for conductivity was around 0.2 mass% of SWCNT [19]. Furthermore, significant enhancement in rheological properties and electrical conductivity (20 orders of magnitude to 1 S m -1 at 12 vol.%) for the PS/MWCNTs due to the formation of the interpenetrating phases was observed [20].…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation kinetics of PET/SWCNTs nanocomposites prepared by the in situ polymerization

Pilawka

Paszkiewicz

Rosłaniec

2013

J Therm Anal Calorim

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The decomposition and thermal behavior of poly(ethylene terephthalate) (PET)/carbon nanotubes (CNTs) nanocomposites were studied using thermogravimetric (TG) analysis in air atmosphere. A series of PET/ single-walled CNTs (SWCNTs) materials of varying nanoparticles concentration were prepared using the in situ polymerization technique. Transmission electron microscopy and scanning electron microscopy micrographs verified that the dispersion of the SWCNTs in the PET matrix was homogeneous, while some relatively small aggregates co-existed at higher filler concentration. Two-stage decomposition was observed in the experiments. During first stage, strong chemical bonds are broken, i.e., aliphatic bonds and benzyl ring containing molecules decompose into small molecules in the gaseous phase. During second stage, when temperature is higher, the remaining nanotubes along with the residues of the first stage are burned. 10,20, ) methods were applied to TG data to obtain kinetic parameters (activation energy, Arrhenius constant at 600 K and A factor) and Criado method to kinetics model analysis. In this kinetic model, energy activation is increasing with the increase of nanotubes concentration.

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“…Introduction of small quantities of CNTs into a polymer matrix can lead to obtain structural composites with high elastic modulus, high tensile and compressive strength and stiffness. The mechanical properties combined with electrical, thermal, optical and many other properties have been extensively investigated by many research groups for wide range of applications [22][23][24][25][26][27][28][29][30]. In this work, poly(trimethylene terephthalate)/multiwalled carbon nanotubes nanocomposites were prepared by in situ polymerization method.…”

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confidence: 99%

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

Szymczyk¹,

Rosłaniec²,

Zenker³

et al. 2011

Express Polym. Lett.

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Poly(trimethylene terephthalate) nanocomposites containing COOH functionalized multi-walled nanotubes were synthesized with in situ polymerization method. The microstructure of the nanocomposites was studied by SEM, in terms of the dispersion state of the nanotubes and the polymer–nanotube interface. The thermal behaviour, mechanical properties and conductivity of these resultant PTT/MWCNTs nanocomposites were studied. The effect of the presence of MWCNTs on cold crystallization of PTT was monitored by dielectric spectroscopy. From thermal analysis study, it is found that the melting temperature and glass transition temperature are not significantly affected by the addition of MWCNTs. The crystallization temperature of PTT matrix is affected by the presence of CNTs. Nanocomposites have slightly higher degree of crystallinity than neat PTT and their thermo-oxidative stability is not significantly affected by the addition of MWCNTs. The study of the isothermal cold crystallization of amorphous PTT and its nanocomposites monitored by dielectric spectroscopy reveals that the presence of MWCNTs have influence on crystallization rate, especially at higher concentration (0.3 wt%). In comparison with neat PTT, the MWCNTs reinforced nanocomposites posses higher tensile strength and Young’s modulus at low MWCNTs loading (0.05–0.3 wt%). In addition, all nanocomposites show reduction of brittleness as compared to the neat PTT. The electrical percolation threshold was found between 0.3 and 0.4 wt% loading of MWCNTs

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Low Percolation Threshold in Nanocomposites Based on Oxidized Single Wall Carbon Nanotubes and Poly(butylene terephthalate)

Cited by 204 publications

References 22 publications

Carbon nanotubes‐reinforced PET nanocomposite by melt‐compounding

Carbon nanotubes‐reinforced PET nanocomposite by melt‐compounding

Thermal degradation kinetics of PET/SWCNTs nanocomposites prepared by the in situ polymerization

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

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