Filler dispersion and electrical properties of polyamide 12/MWCNT-nanocomposites produced in reactive extrusion via anionic ring-opening polymerization

Hänsch, Sven; Socher, Robert; Pospiech, Doris; Voit, Brigitte; Harre, Kathrin; Pötschke, Petra

doi:10.1016/j.compscitech.2012.07.008

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…Also by comparing the in situ and melt compounding polymerization results, it was obvious that the former method performed better, according to Fig. .…”

Section: Polyamide Nanocomposites Based On Carbon Nanofillersmentioning

confidence: 97%

“…Laurolactam in situ polymerization was investigated by Hänsch et al in 2012, in order to synthesis Polyamide 12/MWCNT nanocomposite in a microcompounder . The operating conditions were optimized according to the electrical resistance and MWCNT dispersion.…”

Section: Polyamide Nanocomposites Based On Carbon Nanofillersmentioning

confidence: 99%

“… Comparison MWCNT dispersion in nanocomposites with 2 wt% MWCNT (a) melt mixed bulk PA12 and (b) in situ polymerization .…”

Section: Polyamide Nanocomposites Based On Carbon Nanofillersmentioning

confidence: 99%

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Polyamide/Carbon Nanoparticles Nanocomposites: A Review

2016

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This review is designed to be a comprehensive source for polyamide (PA) nanocomposite research, including fundamental structure/property relationships, manufacturing techniques, and applications of these materials. This work presents the scientific framework for the advances in PA nanocomposite containing carbon nanofiller, and different methods applied in order to synthesis them. This review focuses on the scientific principles and mechanisms in relation to the methods of processing and manufacturing. A comprehensive discussion on technology, modeling, characterization, processing, manufacturing, and applications have been done. The processing and properties of PA nanocomposites with carbon nanofillers are investigated. In addition, the mechanical properties and morphology changes of PA with the incorporation of nanoparticles are described. POLYM. ENG. SCI., 57:475-494, 2017.

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“…Also by comparing the in situ and melt compounding polymerization results, it was obvious that the former method performed better, according to Fig. .…”

Section: Polyamide Nanocomposites Based On Carbon Nanofillersmentioning

confidence: 97%

Section: Polyamide Nanocomposites Based On Carbon Nanofillersmentioning

confidence: 99%

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Polyamide/Carbon Nanoparticles Nanocomposites: A Review

2016

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“…By increasing the amount of MWCNT the resistivity decreased slightly until it reached its percolation ratio and a sudden decrease in the resistivity occurred. In this work, the percolation ratio is about 1.2 wt% MWCNT, which is less than the ratio of 1.7 wt% reported in the literature [36]. Electrical conductivity could be expressed as the following equation:

σ \sim {(φ - φ_{ec})}^{β_{normalec}}

…”

Section: Resultsmentioning

confidence: 75%

Rheological and electrical percolation thresholds of multi‐walled carbon nanotube/in‐situ polymerised Nylon12 nanocomposites

Faridirad

Ahmadi

Barmar

2018

Micro & Nano Letters

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In this work, in-situ polymerisation of laurolactam in the presence of multi-walled carbon nanotube (MWCNT) was performed toward MWCNT/Nylon12 nanocomposite. Different levels of MWCNT (0.1, 0.3, 0.7, 1.2 and 3.5 wt%) were introduced to the monomer in the presence of 2 wt% toluene diisocyanate and 1 wt% sodium caprolactam as an activator and catalyst, respectively. The test results indicated that by increasing the amount of MWCNT, the conductivity of the nanocomposite increased up to that level at which it could serve as an electrically conductive material at room temperature. The melt rheological measurements showed a transition from liquid-like to solid-like state. The rheological results obtained within the linear viscoelastic region demonstrated that the rheological percolation threshold happened at 0.1 wt% multi-walled nanotube (MWNT), whereas the electrical percolation threshold appeared at 1.2 wt% MWCNT. A homogeneous dispersion of MWCNT into the Nylon12 matrix with a high aspect ratio of MWNT was achieved at a low percolation threshold. This mainly could be attributed to the fact that a denser MWCNT network was required for electrical conductivity, while a less dense MWCNT network sufficiently impeded Nylon12 chain mobility related to the rheological percolation threshold.

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“…From the least squares fit, 150 S/cm, 2.8 vol.%, and 4.99 were obtained, respectively, for σ f , V f p , and the exponent t in (2). The xGnP's percolation of 2.8 vol.% (equivalent to 4.6 wt.%) is also slightly higher than typical percolation thresholds of CNT polymer composites (<3 wt.%) [22][23][24][25], the reason for which is explained in Section 3.2. Typical t values are in the range of 1.6-1.9 for three-dimensional systems [16][17][18][19][20]; however, a number of researchers have reported that the critical exponent could be as high as 2, 3, or even much higher [18-20, 26, 27] because of special geometry, tunneling effect, and coalescence of conducting particles [28].…”

Section: Determination Of Maximum Xgnp Loading (Experiments 1)mentioning

confidence: 93%

Design, Manufacturing, and Characterization of High-Performance Lightweight Bipolar Plates Based on Carbon Nanotube-Exfoliated Graphite Nanoplatelet Hybrid Nanocomposites

Kim

Kang

Park

et al. 2012

Journal of Nanomaterials

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We report a study on manufacturing and characterization of a platform material for high-performance lightweight bipolar plates for fuel cells based on nanocomposites consisting of carbon nanotubes (CNTs) and exfoliated graphite nanoplatelets (xGnPs). The experiments were designed and performed in three steps. In the preexperimental stage, xGnP-epoxy composite samples were prepared at various xGnP weight percentages to determine the maximum processable nanofiller concentration. The main part of the experiment employed the statistics-based design of experiments (DOE) methodology to identify improved processing conditions and CNT : xGnP ratio for minimized electrical resistivity. In the postexperimental stage, optimized combinations of material and processing parameters were investigated. With the aid of a reactive diluent, 20 wt.% was determined to the be maximum processable carbon nanomaterial content in the epoxy. The DOE analyses revealed that the CNT : xGnP ratio is the most dominant factor that governs the electrical properties, and its implications in relation to CNT-xGnP interactions and microstructure are elucidated. In addition, samples fabricated near the optimized condition revealed that there exists an optimal CNT : xGnP ratio at which the electrical performance can be maximized. The electrical and mechanical properties of optimal samples suggest that CNT-xGnP hybrid nanocomposites can serve as an alternative material platform for affordable, lightweight bipolar plates.

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Filler dispersion and electrical properties of polyamide 12/MWCNT-nanocomposites produced in reactive extrusion via anionic ring-opening polymerization

Cited by 10 publications

References 24 publications

Polyamide/Carbon Nanoparticles Nanocomposites: A Review

Polyamide/Carbon Nanoparticles Nanocomposites: A Review

Rheological and electrical percolation thresholds of multi‐walled carbon nanotube/in‐situ polymerised Nylon12 nanocomposites

Design, Manufacturing, and Characterization of High-Performance Lightweight Bipolar Plates Based on Carbon Nanotube-Exfoliated Graphite Nanoplatelet Hybrid Nanocomposites

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