Attaining low percolation threshold in conductive polypropylene/nitrile rubber thermoplastic vulcanizates using carbon nanotube

Gabino, Alessandra de Alencar Padua; Soares, Bluma G.; Silva, Adriana A.

doi:10.1002/app.49857

Cited by 9 publications

(11 citation statements)

References 50 publications

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“…Figure a shows the electrical conductivity of PLA/ENR/CNT@KH570 TPV with different contents of CNT@KH570 and preparation methods. Although the content of CNT@KH570 is high up to 2.47 vol % (10 phr in PLA), the conductivities of the TPVs prepared by the two reported methods , are only 1.34 × 10 –13 and 1.04 × 10 –11 S/m, respectively. Therefore, it is unrealistic to prepare PLA-based conductive TPV using the two reported methods.…”

Section: Resultsmentioning

confidence: 99%

“…The percolation threshold of CNT decreased from 1 wt % of the MA- g -PE/CNT composite to 0.5 wt % of MA- g -PE/PVR/CNT TPV. (2) Regulating the timing of filler addition promotes the conductive fillers to distribute in the plastic phase. − Salaeh et al added CB into the poly(vinylidene fluoride) (PVDF)/epoxidized natural rubber (ENR) TPV after dynamic vulcanization. CB was selectively dispersed in the PVDF phase, and the percolation threshold of CB was 4.40 wt %, which decreased a lot compared with the TPV in which CB was added before dynamic vulcanization (10.45 wt %).…”

Section: Introductionmentioning

confidence: 99%

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Biobased Foamed Thermoplastic Vulcanizate with Good Electromagnetic Interference and Self-Healing Performance

Gong

Wang

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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So far, functional polylactic acid-based thermoplastic vulcanizate (PLA-based TPV) has been less reported due to the low melt viscosity of PLA, which makes it difficult for the functional filler to be uniformly disperse in the TPV. In this work, we provide a novel stratagem to control the distribution of carbon nanotubes (CNT) in the PLA-based TPV and prepare a functional PLA-based TPV with good electromagnetic interference (EMI) and self-healing ability. We anchor the modified CNT in the PLA phase by grafting it on the PLA chains, to avoid the destruction of the conductive network by dynamic vulcanization. Simultaneously, the CNT selectively distributed in the PLA phase has little influence on the reconstruction of disulfide bonds in the epoxidized natural rubber (ENR) phase, resulting in a good self-healing ability of the TPV. When the content of CNT is 2 phr in PLA and the content of the curer is 3 phr in ENR, a PLA-based TPV with balanced electrical conductivity (1.54 × 10–4 S/m) and self-healing ability (67.5% after healing at 80 °C for 5 h) is prepared. Furthermore, the TPV can be foamed with the assistance of supercritical CO2, and the conductive path formed by CNT and the multi-interface result in a good EMI performance of the foamed TPV (up to 20 dB). The multifunctional biobased TPV shows great potential to be applied in the EMI field.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Biobased Foamed Thermoplastic Vulcanizate with Good Electromagnetic Interference and Self-Healing Performance

Gong

Wang

Chen

et al. 2023

ACS Sustainable Chem. Eng.

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“…73,74 Rheological analyses play a crucial role in investigating the formation of a physical additive network, such as carbon nanotubes (CNT), within polymer matrices. 75 Katbab et al prepared PP/EPDM samples with carbon black added by dynamic vulcanization method and investigated their rheological behavior. In the cured PP and EPDM blend prepared by mixing at different ratios, increases in shear viscosities were observed as the amount of rubber increased.…”

Section: Rheological Propertiesmentioning

confidence: 99%

A comprehensive review of the recent developments in thermoplastics and rubber blends‐based composites and nanocomposites

Urtekin,

Ullah,

Yildirim

et al. 2023

Polymer Composites

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Various blends and composites have been prepared during the past decade to address limitations, including the poor mechanical properties of polymers, or to balance out the high cost of synthetic polymers. Rubber‐based thermoplastic blends and composites are being developed to attain improved performance and balanced qualities for usage in a variety of industries, including automotive, packaging, home products, space technology, and biomedical. Thermoplastics can be produced via standard manufacturing procedures and have outstanding qualities like low density, good chemical resistance, and heat resistance. However, rubbers are being used because of their elastic attributes, including their resilience, impact resistance, and good tear strength. These two materials work well together when blended or combined. In this article, an effort was made to narrow the gap between rubbers and thermoplastics. The mechanical, rheological, and morphological properties of the rubber/thermoplastic blends and composites/nanocomposites containing various types of conventional fillers and nanofillers were discussed comprehensively. Blends of these materials can provide too easier melt processing as well as financial benefits. The flexible nature and damping properties of rubber and better thermal stability and thermoplastic processability contributed to the development of high‐performance rubber/thermoplastic composites with better ductility, impact strength, and stiffness. Rubber reduced the high brittleness of thermoplastics because of its resilience and damping properties. In contrast, the poor processability and weak chemical resistance of rubbers were overcome via better processability and higher stiffness of thermoplastics. Rubber‐based thermoplastic composites and nanocomposites have been reported to offer greater flexibility, better processing, high impact strength, and chemical resistance.Highlights The properties of rubber/thermoplastic blends were discussed in this article. More recent advancements in rubber/thermoplastic blends were evaluated. Morphological properties depend on the rubber/thermoplastic blend ratio. The addition of reinforcements affects the rheological properties. Dispersion of additives and blend ratio influence the mechanical properties.

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“…Recently, a variety of methods have been proposed to lower the percolation threshold of the conductive composites 7–9 . Among them, a constructive way is to construct conductive composites with double percolation structure 10–12 .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a variety of methods have been proposed to lower the percolation threshold of the conductive composites. [7][8][9] Among them, a constructive way is to construct conductive composites with double percolation structure. [10][11][12] That is, in immiscible polymer blends, conductive fillers are preferentially located in one polymer phase or at the phase interface to achieve percolation, and this polymer phase forms a continuous phase in the composites.…”

Section: Introductionmentioning

confidence: 99%

Relationship between microstructure evolution and properties enhancement of carbon nanotubes‐filled polybutylene terephthalate/polypropylene blends induced by thermal annealing

Shang

Gao

Cheng

et al. 2021

J of Applied Polymer Sci

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Thermal annealing induced microstructure evolution and properties enhancement of polybutylene terephthalate/polypropylene/carbon nanotubes (PBT/PP/CNTs) nanocomposites was methodically investigated. The electrical conductive PBT/PP/CNTs nanocomposites with a low percolation threshold were obtained by simple melt blending due to the selective location of the CNTs in PBT phase and the formation of the double percolation structure. Thermal annealing further remarkably decreased the volume resistivity of the nanocomposites, with the maximum reduction of seven orders of magnitude. Scanning electron microscope observation and rheology tests demonstrated that the relatively large CNTs agglomerates were redistributed to build more homogeneous CNTs networks after annealing. The phase coalescence during annealing promoted the formation of the more perfect co‐continuous structure. These phenomena helped to enhance the electrical conductivity of the nanocomposites. Flexural properties of the nanocomposites were also enhanced after annealing, which might be due to the more effective stress transfer between the polymer and CNTs induced by the reconstructed CNTs networks. The nanocomposites obtained in this study possess excellent electrical and mechanical properties, which can be applied to the fields of sensors, electromagnetic interference shielding, anti‐static materials, and so forth.

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Attaining low percolation threshold in conductive polypropylene/nitrile rubber thermoplastic vulcanizates using carbon nanotube

Cited by 9 publications

References 50 publications

Biobased Foamed Thermoplastic Vulcanizate with Good Electromagnetic Interference and Self-Healing Performance

Biobased Foamed Thermoplastic Vulcanizate with Good Electromagnetic Interference and Self-Healing Performance

A comprehensive review of the recent developments in thermoplastics and rubber blends‐based composites and nanocomposites

Relationship between microstructure evolution and properties enhancement of carbon nanotubes‐filled polybutylene terephthalate/polypropylene blends induced by thermal annealing

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