Thermal properties and transition studies of multi-wall carbon nanotube/nylon-6 composites

Yu, Junchun; Tonpheng, Bounphanh; Gröbner, Gerhard; Andersson, Ove

doi:10.1016/j.carbon.2011.07.006

Cited by 19 publications

(14 citation statements)

References 42 publications

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“…The cell fitted in a piston-cylinder device, as described in detail previously [8]. The pressure was generated by a hydraulic press with inaccuracy of ±40 MPa at 1.0 GPa and the temperature was measured with an internal Chromel-Alumel thermocouple with an inaccuracy of about ±0.2 K. As established previously by thermal conductivity measurements [8,19], nylon-6 shows a transition on heating to above 500 K at 1.0 GPa. The samples studied here are identical to those studied previously by thermal conductivity and heat capacity, in-situ, measurements after treatment at 1.0 GPa (or 1.7 GPa) and 530 K for 4 h [19].…”

Section: Hpandht Experimental Setupmentioning

confidence: 99%

“…A typical purification procedure included oxidation in air, washing in 37% HCl acid (Sigma-Aldrich, ACS reagent) and, subsequently, rinsing by de-ionized and purified water (Milli-Q ® Ultrapure WaterSystem), filtration and drying [20]. The synthesis of 2.1 wt% MWCNT/nylon-6 composite and neat nylon-6 followed the steps suggested by Gao et al [16,17] and has been previously described in detail [19]. The as-made nylon-6 had a viscosity-average molecular weight of 28000 as determined by a falling-ball viscometer (Thermo Scientific HAAKE falling ball viscometer type B).…”

Section: Materials and Pre-treatmentmentioning

confidence: 99%

“…The transition was previously established through high-pressure, in-situ, thermal conductivity measurements, which showed that the thermal conductivity of the highly crystallized state increased ~37% [19]. In this study, we have characterized the HP&HT treated samples of: nylon-6, purified MWCNT filled nylon-6 (P-composite) and functionalized MWCNT filled nylon-6 (Fcomposite), and the corresponding untreated (virgin) samples by WAXD, DSC and solid state NMR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites

Gröbner

Tonpheng

et al. 2011

Polymer

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This is an accepted version of a paper published in Polymer. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the published paper: Yu, J., Gröbner, G., Tonpheng, B., "Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites" Polymer, 52 (24) ABSTRACTMulti-wall carbon nanotube (MWCNT)/nylon-6 composites made by in-situ polymerization and subsequently modified by treatment at 1.0 GPa (or 1.7 GPa) and 530 K have been studied by WAXD, DSC and NMR. The pressure treatment gives an amorphous to crystalline transformation where the crystallinity increases from ~31% to as much as ~58% concurrently as the nylon-6 crystals increase in size and attain a preferred orientation relative to the applied pressure. A composite of 2.1 wt% purified MWCNT in nylon-6 shows significantly higher melting temperature than neat nylon-6 after identical pressure treatments. The improved thermal stability of the composite is attributed to crystal growth in the presence of reinforcing MWCNTs.The NMR spectrum of a pressure treated composite is similar to that of nylon-6 single crystals, which suggests a reduction of crystal boundaries after treatment, but there is no indication of covalent bonds between the nylon-6 chains and the MWCNTs.

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Section: Hpandht Experimental Setupmentioning

confidence: 99%

Section: Materials and Pre-treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites

Gröbner

Tonpheng

et al. 2011

Polymer

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“…M a n u s c r i p t 4 effective way to prevent agglomeration, which helps to better disperse and stabilize the CNTs within a polymer [6]. Up to now, several approaches have been proposed to functionalize the CNT surface, including defect functionalization, non-covalent functionalization and covalent functionalization [7].…”

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confidence: 99%

“…Zheng et al [18] investigated the interfacial bonding characteristics between the SWNT, on which -COOH, -CONH 2 , -C 6 H 11 , or -C 6 H 5 groups have been chemically M a n u s c r i p t 6 attached, and the PE matrix by performing pullout simulations. The results showed that appropriate functionalization of nanotubes at low densities of functionalized carbon atoms drastically increase their interfacial bonding and shear stress between the nanotubes and the polymer matrix.…”

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confidence: 99%

Interfacial properties of carboxylic acid functionalized CNT/polyethylene composites: A molecular dynamics simulation study

Yuan

Chen

et al. 2015

Applied Surface Science

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Effect of Ball Milling and Oxidation on Dispersibility and Dispersion Stability of Multiwalled Carbon Nanotubes in High Viscous Heat Exchange Fluids

et al. 2020

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Multiwalled carbon nanotubes (MWCNTs) tend to agglomerate resulting in poor dispersion in most of the common solvents due to possessing long tubular structure, high Vander Waal force of attractions and poor interfacial interactions with the surrounding matrix. To improve the dispersion stability, MWCNT, were subjected to ball milling with 300 rpm for 1 h to reduce the length of the MWCNT to improve the functional groups to the MWCNT wall during chemical functionalization. MWCNTs were subjected to thermal oxidation in air at different temperatures before acid treatment to remove the amorphous carbon from MWCNT. Morphology studies of MWCNTs nanofluids were carried out by using a SEM and TEM methods to characterize the surface deformity of MWCNT structure and extent of defect formation, respectively. FT IR and XRD methods were used for the identification of different functional groups and crystalline nature of pristine, ball milled and oxidized MWCNT, respectively. Raman spectroscopy was applied to measure the relative intensities (ID/IG) to estimate the defect ratios. Preparation of nanofluid by dispersing high defect ratio MWCNTs with a concentration of 100 ppm in the base fluid by the ultra‐sonication method. Nanofluids dispersion stability and cycle stability were studied by using UV‐Visible spectroscopy and MWCNTs treated with combined ball milling and oxidation method have exhibited high stability and high dispersibility.

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Thermal properties and transition studies of multi-wall carbon nanotube/nylon-6 composites

Cited by 19 publications

References 42 publications

Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites

Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites

Interfacial properties of carboxylic acid functionalized CNT/polyethylene composites: A molecular dynamics simulation study

Effect of Ball Milling and Oxidation on Dispersibility and Dispersion Stability of Multiwalled Carbon Nanotubes in High Viscous Heat Exchange Fluids

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