Melt mixed nano composites of PA12 with MWNTs: Influence of MWNT and matrix properties on macrodispersion and electrical properties

Socher, Robert; Krause, Beate; Boldt, Regine; Hermasch, Sylvia; Wursche, Roland; Pötschke, Petra

doi:10.1016/j.compscitech.2010.11.015

Cited by 79 publications

(41 citation statements)

References 40 publications

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“…The MWCNT material with the best dispersability leads to a significantly lower electrical percolation threshold in comparison to the MWCNTs with the worse dispersability. Comparable results were described from Krause et al [11] for different kinds of CNTs and the electrical percolation behaviour of these CNTs in polyamide 6.6 and by Socher et al [12] for composites based on polyamide 12. Nanotube materials with a good stability of their aqueous dispersions also showed a good dispersion after melt mixing as indicated by morphological investigations and exhibited low electrical percolation thresholds in the composites.…”

Section: Introductionsupporting

confidence: 61%

Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Krause

Villmow

Boldt

et al. 2011

Composites Science and Technology

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133

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractBall milling of carbon nanotubes (CNTs) in the dry state is a common way to produce tailored CNT materials for composite applications, especially to adjust nanotube lengths. For Nanocyl TM NC7000 nanotube material before and after milling for 5 and 10 hours the length distributions were quantified using TEM analysis, showing decreases of the mean length to 54 and 35%, respectively. With increasing ball milling time in addition a decrease of agglomerate size and an increase of packing density took place resulting in a worse dispersability in aqueous surfactant solutions. In melt mixed CNT polycarbonate composites produced using masterbatch dilution step the electrical properties, the nanotube length distribution after processing, and the nano-and macrodispersion of the nanotubes were studied. The slight increase in the electrical percolation threshold in the melt mixed composites with ball milling time of CNTs can be assigned to lower nanotubes lengths as well as the worse dispersability of the ball milled nanotubes. After melt compounding, the mean CNT lengths were shortened to 31%, 50%, and 66% of the initial lengths of NC7000, NC7000-5h, and NC7000-10h, respectively.

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Section: Introductionsupporting

confidence: 61%

Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Krause

Villmow

Boldt

et al. 2011

Composites Science and Technology

Self Cite

133

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“…Polyamide-CB composites have also been prepared and studied [21][22][23]. CB powders are much cheaper than CNT which is important for industrial applications, however their percolation thresholds are significantly higher -0.7-2.1 wt% for CNT against 4.3 wt% for CB introduced into PA12 matrix [24]. Exfoliated GR-containing polyamides have been prepared and investigated predominantly in terms of increasing the mechanical properties [25] or thermal diffusivity [26] of the matrix material, whereby the larger the GR stacks size and their exfoliation ratio, the more effective the formation of 3-dimensional conductive pathways and high thermal diffusivity.…”

mentioning

confidence: 99%

Reactive microencapsulation of carbon allotropes in polyamide shell-core structures and their transformation in hybrid composites with tailored electrical properties

Oliveira¹,

Dencheva²,

Martins³

et al. 2016

Express Polym. Lett.

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“…This unexpected result can be explained considering that the functionalization partially destroyed the graphenic sp 2 structure of the CNTs walls after introducing oxygen moieties as demonstrated by the increase of the ID/IG ratio as measured by Raman spectroscopy and discussed in our previous works [5,10]. Other authors [23][24][25] while studying PA12/CNT systems found some relationship between the rheological behaviour of PA12, its end groups and the electrical conductivity of the nanocomposites. Another possible explanation of the phenomenon can also be found in the high polymer/nanotubes interactions: the polymer, completely wrapping the nanotubes, can considerably reduce the electron tunnelling that is at the base of the electrical conductivity in this kind of systems [21,22,26].…”

Section: Resultsmentioning

confidence: 88%

High performance PA6/CNTs nanohybrid fibers prepared in the melt

Scaffaro

Tito

2012

Composites Science and Technology

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a b s t r a c tCommercial and home-made carbon nanotubes (CNTs) were plasma treated under oxygen atmosphere and then added to polyamide 6 (PA6) in order to prepare fibres by melt spinning. For comparison, pristine nanofillers were used too. The effect of functionalization and of filler characteristics on the morphological, rheological, mechanical and electrical properties of the fibres was studied by TEM and SEM, rheological measurements, tensile and electrical conductivity tests. The results demonstrated that the functionalization led to a better mechanical performance and the morphological analysis confirmed that the adhesion, the dispersion and the alignment of the nanotubes within the polymer matrix were improved when using functionalized CNTs. Electrical tests marked that functionalization slightly reduced the conductivity of the materials.

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Melt mixed nano composites of PA12 with MWNTs: Influence of MWNT and matrix properties on macrodispersion and electrical properties

Cited by 79 publications

References 40 publications

Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Influence of dry grinding in a ball mill on the length of multiwalled carbon nanotubes and their dispersion and percolation behaviour in melt mixed polycarbonate composites

Reactive microencapsulation of carbon allotropes in polyamide shell-core structures and their transformation in hybrid composites with tailored electrical properties

High performance PA6/CNTs nanohybrid fibers prepared in the melt

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