Electrical conductivity and major mechanical and thermal properties of carbon nanotube‐filled polyurethane foams

Yan, Ding‐Xiang; Dai, Kun; Xiang, Zhi-Dong; Li, Zhong‐Ming; Ji, Xu; Zhang, Weiqin

doi:10.1002/app.33437

Cited by 82 publications

(70 citation statements)

References 42 publications

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“…The thickness of the foam is selected such that the radiation is optimized. The filing factor of the CB and the MWCNT plays an important role [11] [12], they are selected optimally. If the concentrations are too high the foam becomes inflexible and the lifetime of the foam is also get reduced.…”

Section: Preparation Of Cb and Mwcnt Loaded Electro Conductive Foammentioning

confidence: 99%

“…Moreover it was also assumed that the conductive materials are purely conductive so that there are no diffusing current components. Also the electrical conductivities of the CB/MWCNT are dependent of the temperature and has nonlinear characteristics [11]. The electrodes have linear temperature dependent electrical conductivities.…”

Section: Electro Thermal Model Of the Ftrmentioning

confidence: 99%

“…The electrodes have linear temperature dependent electrical conductivities. The physical properties such as densities, specific heat capacities and thermal conductivities are all have temperature dependent nonlinear characteristics for the both CB/MWCNT load foam and the electrodes materials [11] [12]. The 3 parts are shown in the following Figure 5.…”

Section: Electro Thermal Model Of the Ftrmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Black and Multi Wall Carbon Nanotubes Loaded Polyurethane Foam Composite Flexible Thermal Radiator

Wijesiriwardana¹

2015

MSCE

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Carbon black (CB) or multi walled carbon nanotubes (MWCNT) loaded polyurethane conductive foams are used as heaters, electrodes, radar absorbers and shielding. This paper discusses the performance of an innovative flexible thermal radiator (FTR) constructed with CB filled or MWCNT filled conductive foam and powering electrode structure constructed with textiles manufacturing process (knitting, weaving or nonwoven). Silver (Ag) yarns are used for the powering electrodes construction. This paper discusses the construction, electro-thermal analysis, performance and applications of FTR. Also this paper compare the thermal and electrical characteristics of CB filled and MWCNT filled FTRs. The electro-thermal model is simulated by using finite element methods.

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Section: Preparation Of Cb and Mwcnt Loaded Electro Conductive Foammentioning

confidence: 99%

Section: Electro Thermal Model Of the Ftrmentioning

confidence: 99%

Section: Electro Thermal Model Of the Ftrmentioning

confidence: 99%

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Carbon Black and Multi Wall Carbon Nanotubes Loaded Polyurethane Foam Composite Flexible Thermal Radiator

Wijesiriwardana¹

2015

MSCE

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“…Carbon nanotubes (CNTs) are lightweight materials, that have strong microwave absorption properties in the GHz frequency range [3,4]. Nanometer-scale diameter CNTs can avoid the limitation of large-sized conventional conductivity fillers, and their extremely large aspect ratio allows low loading of fillers to provide the desired electrical conductivity without sacrificing other inherent properties of the polymer.…”

Section: Introductionmentioning

confidence: 99%

Dispersion of carbon nanotube (CNT) in bismaleimide(BMI) to prepare CNT/BMI foam

Liu¹

2015

Proceedings of the 3rd International Conference on Advances in Energy and Environmental Science 2015

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Abstract. Bismaleimide(BMI) structural foams employing carbon naotubes (CNTs) as functional fillers were prepared in this paper. Physical dispersion methods, such as mechanical mixing, ball milling and calendering process (three-roll milling), were adopted to disperse CNTs in the bismaleimide matrix to foam. The effects of the dispersion method on viscosity, bubble morphology were studied. The results indicated that, three-roll milling can more efficiently separate individual CNTs from the agglomerates compared with the other two methods. Because of more individual CNT to restraining the BMI chains, which exhibited the highest viscosity, the most irregular cell shape.

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“…Electrical conductivity of nano-composite foams is much less studied. Works on the electrical properties of nanoreinforced polymeric foams are rather sporadic [3][4][5][6][7][8][9][10]. The relationship between the resulting electrical conductivity and the density of the rigid foams for given CNT concentrations was reported in [6] but only recently described further [10].…”

mentioning

confidence: 99%

Sensing strain and damage in polyurethane/MWCNT nano-composite foams using electrical measurements

Baltopoulos¹,

Αθανασόπουλος²,

Fotiou³

et al. 2013

Express Polym. Lett.

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The addition of carbon nano-fillers (nanofibers (CNF), nanotubes (CNT) etc.) into plastics has been shown to affect the various properties of the resulting material and effectively increase the electrical conductivity of the system by several orders of magnitude [1]. This is attributed to the formation of a conductive network of the conductive nanofillers, which can be described as a percolated network. The increased electrical conductivity of the nano-reinforced materials has given rise to their use in various applications [2]. Polymeric foams (e.g. Rigid PolyUrethane (PUR)) represent a very interesting and useful sub-group, finding vast range of applications due to their versatility. In structural applications, they are commonly used due to the weight saving capabilities they can offer in the design (e.g. as sandwich cores). Combining nano-fillers with foam materials, nanoreinforcement of foams has been developed and studied the past decade, but mainly focused on the mechanical and thermal properties. Electrical conductivity of nano-composite foams is much less studied. Works on the electrical properties of nanoreinforced polymeric foams are rather sporadic [3][4][5][6][7][8][9][10]. The relationship between the resulting electrical conductivity and the density of the rigid foams for given CNT concentrations was reported in [6] but only recently described further [10]. 40Sensing strain and damage in polyurethane-MWCNT nano-composite foams using electrical measurements A. Baltopoulos, N. Athanasopoulos, I. Fotiou, A. Vavouliotis Abstract. This work deals with the damage identification in polymeric foams through the monitoring of the electrical resistance of the system. To assess this idea electrically conductive rigid Poly-Urethane (PUR) foams at various densities were prepared. Multi-Wall Carbon Nanotubes (MWCNT) were dispersed in the host polymer at various concentrations through high shear mixing to provide electrical conductivity to the system. The PUR/MWCNT foams exhibited varying electrical conductivity on a wide range of densities and nano-filler contents. The prepared foams were subject to compression tests. Electrical resistance was recorded online during the tests to monitor the change of the bulk property of the materials. A structural-electrical cross-property relation was exhibited. The distinctive phases of foam compression were successfully identified from the electrical resistance profile recorded during the tests. A characteristic master curve of the change of electrical resistivity with respect to load and damage is proposed and analyzed. It was shown that the found electrical resistance profile is a characteristic of all the MWCNT contents and depends on density and conductivity. MWCNT content contributes mainly to the sensitivity of electrical sensing in the initial stage of compression. Later compression stages are dominated by foam microstructural damage which mask any effect of CNT dispersion. Micro-structural observations were employed to verify the experimental findings and curves.Keywo...

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Electrical conductivity and major mechanical and thermal properties of carbon nanotube‐filled polyurethane foams

Cited by 82 publications

References 42 publications

Carbon Black and Multi Wall Carbon Nanotubes Loaded Polyurethane Foam Composite Flexible Thermal Radiator

Carbon Black and Multi Wall Carbon Nanotubes Loaded Polyurethane Foam Composite Flexible Thermal Radiator

Dispersion of carbon nanotube (CNT) in bismaleimide(BMI) to prepare CNT/BMI foam

Sensing strain and damage in polyurethane/MWCNT nano-composite foams using electrical measurements

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