Anisotropically conductive polymer composites with a selective distribution of carbon black in an in situ microfibrillar reinforced blend

Zhang, Y.; Dai, Kun; Tang, Jianhua; Ji, Xu; Li, Zhong‐Ming

doi:10.1016/j.matlet.2010.03.041

Cited by 47 publications

(29 citation statements)

References 14 publications

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“…Recently, some investigations have shown that practical conductive systems do not always coincide with the universal law. [17][18][19][20][21] Some of these researchers considered that only single phase conductive composites coincide well with the universal law, while multiphase conductive systems, especially multipercolation systems, would not coincide with Eq. 1.…”

Section: Resultsmentioning

confidence: 99%

Electrically Conductive Multiwall Carbon Nanotubes/Poly(vinyl alcohol) Composites with Aligned Porous Morphologies

2012

Journal of Macromolecular Science, Part B

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Electrically conductive multiwall carbon nanotubes (MWNTs)/poly(vinyl alcohol) (PVA) composites with aligned porous structure were obtained by a directional freezedrying process. The results show that the morphologies of the MWNTs/PVA composite can be tailored by adding different contents of MWNTs in the PVA matrix. Because of the aligned porous structure of the MWNTs/PVA composites, the conductivity property of MWNTs/PVA composite does not coincide absolutely with the universal percolation theory. In the aligned porous MWNTs/PVA composites, the existence of the micro-pores destroys the uniform distribution of the conductive network along the direction perpendicular to the aligned pores and results in a nonuniform distribution conductive network. When being used to monitor flowing vapors in pipes, compared with a film sensor with the thickness from several decades to hundreds of microns, the aligned porous conductive MWNTs/PVA composite with micron-sized pores should be a much better sensor.

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Section: Resultsmentioning

confidence: 99%

Electrically Conductive Multiwall Carbon Nanotubes/Poly(vinyl alcohol) Composites with Aligned Porous Morphologies

2012

Journal of Macromolecular Science, Part B

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“…In this way, in addition to samples with bulk loading (Figure 1a), we have the second candidate (Figure 1c) for the comparative study, and only the third type, with interfacial loading of fillers (Figure 1d) is missing. Many researchers [11,17,19,43] published results of similar studies, where they prepared polymer blends with MFC structure, loading with carbon black either the microfibril forming component (PET) or the matrix (PE) in amounts between 3 and 13 vol%. They found an accumulation of CB at the interfacial layer, so that a higher CB concentration as compared to that of the microfibrils or the matrix was reached at the interface.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…They found an accumulation of CB at the interfacial layer, so that a higher CB concentration as compared to that of the microfibrils or the matrix was reached at the interface. Contrasting these studies [11,17,19,43], our main target was to deliver the conductive filler (CNTs) more precisely -only to the interface between reinforcement and matrix as mentioned above. Towards this target, a compatibilizer was chosen as the carrier of CNTs.…”

Section: Sample Characterizationmentioning

confidence: 99%

“…An idea of how the values of volume resistivity from samples prepared in this study are related to the typical percolation thresholds of similar systems could be got from Figure 7. Samples 1-6 refer to published data [12,43,49,[52][53][54][55], whereas sample 6 represents the compatibilizer material used in this study, and samples 7-10 are from the present study. In the majority of cases the conductive filler is dispersed in the polymer bulk ( Figure 7 demonstrate the extremely strong dependence of the volume resistivity on the concentration of the filler -a change of CNT concentration by 1 vol% can result in a decrease of the resistivity by up to 10 orders of magnitude.…”

Section: Electrical Properties Of the Blend Pphv/pet/(pp-g-ma/cnt)mentioning

confidence: 99%

“…The experience gained from this study was helpful in selecting the material ratios and processing parameters used in the current study. A significant amount of work related to MFC-based CPCs has been carried out previously [11,17,[41][42][43]. Early studies dealt with MFCs of polyethylene (PE)/poly(ethylene terephthalate) (PET) with CB as a filler.…”

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confidence: 99%

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Conductivity of microfibrillar polymer-polymer composites with CNT-loaded microfibrils or compatibilizer: A comparative study

Panamoottil¹,

Pötschke²,

Lin³

et al. 2013

Express Polym. Lett.

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Conductive polymer composites have wide ranging applications, but when they are produced by conventional melt blending, high conductive filler loadings are normally required, hindering their processability and reducing mechanical properties. In this study, two types of polymer-polymer composites were studied: i) microfibrillar composites (MFC) of polypropylene (PP) and 5 wt% carbon nanotube (CNT) loaded poly(butylene terephthalate) (PBT) as reinforcement, and ii) maleic anhydride-grafted polypropylene (PP-g-MA) compatibilizer, loaded with 5 wt% CNTs introduced into an MFC of PP and poly(ethylene terephthalate) (PET) in concentrations of 5 and 10 wt%. For the compatibilized composite type, PP and PET were melt-blended, cold-drawn and pelletized, followed by dry-mixing with PP-g-MA/CNT, re-extrusion at 200°C, and cold-drawing. The drawn blends produced were compression moulded to produce sheets with MFC structure. Using scanning electron microscopy, CNTs coated with PP-g-MA could be observed at the interface between PP matrix and PET microfibrils in the compatibilized blends. The volume resistivities tested by four-point test method were: 2.87•108 and 9.93•107 Ω•cm for the 66.5/28.5/5 and 63/27/10 (by wt%) PP/PET/(PP-g-MA/CNT) blends, corresponding to total CNT loadings (in the composites) of 0.07 vol% (0.24 wt%) and 0.14 vol% (0.46 wt%), respectively. For the non-compatibilized MFC types based on PP/(PBT/CNT) with higher and lower melt flow grades of PP, the resistivities of 70/(95/5) blends were 1.9•106 and 1.5•107 Ω•cm, respectively, corresponding to a total filler loading (in the composite) of 0.44 vol% (1.5 wt%) in both MFCs

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Crystallization Behavior and Sensing Properties of Bio‐Based Conductive Composite Materials

et al. 2022

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Poly(3‐hydroxyoctanoate) (PHO), a biocompatible polymer with a skin‐like feel produced by bacterial fermentation, is compounded with carbon nanofibers (CNFs) or carbon black (CB), respectively, to form flexible, 3D printable, bio‐based conductive composites. Conductivities up to 10 and 3 S m−1 can be achieved for CNF and CB, respectively, without negatively affecting the composites’ processability. Both filler materials act as nucleating agents for PHO crystallization, significantly accelerating this process which is extremely slow for the filler‐free polymer. Mechanical performance, for example, elastic modulus, is also improved by the addition of CNF or CB. Both types of filler form composites that show a distinct response to mechanical deformation: bending, twisting, and stretching (up to 10% elongation) result in a marked decrease in their electrical resistance (up to 30%). This phenomenon has been exploited to fabricate a 3D‐printed strain sensor that can detect flection and extension via a change in resistance. The results demonstrate the potential of this sustainable biopolymer and its composites for applications in the biomedical space.

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Anisotropically conductive polymer composites with a selective distribution of carbon black in an in situ microfibrillar reinforced blend

Cited by 47 publications

References 14 publications

Electrically Conductive Multiwall Carbon Nanotubes/Poly(vinyl alcohol) Composites with Aligned Porous Morphologies

Electrically Conductive Multiwall Carbon Nanotubes/Poly(vinyl alcohol) Composites with Aligned Porous Morphologies

Conductivity of microfibrillar polymer-polymer composites with CNT-loaded microfibrils or compatibilizer: A comparative study

Crystallization Behavior and Sensing Properties of Bio‐Based Conductive Composite Materials

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