Electrical Conduction and Percolation Behavior of Carbon Nanotubes/UPR Nanocomposites

Wu, Shihong; Iwamoto, Masaharu; Natsuki, Toshiaki; Ni, Qing‐Qing

doi:10.1177/0731684406069923

Cited by 29 publications

(23 citation statements)

References 18 publications

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“…These results show that the simulator generated consistent values in p c determination compared with those found in the literature 10 and evaluated by theoretical approach of random particle distribution. Some studies state low p c values with low ar values [11][12][13] . This difference occurred because the simulation was performed in 2D, resulting in values higher than would be the actual condition, 3D, where the possibility of contact between the particles would be higher, thus requiring lower fillers concentrations to the percolation.…”

Section: Simulation Of Composite With Carbon Nanotubesmentioning

confidence: 99%

“…Upon reaching a concentration where an interconnected network of conducting elements is formed, the program encounters the critical value called the percolation limit (p c ) 4 . The vast majority of theoretical works cited in the literature [10][11][12][13] are considered to be straight or rigid rods. However, this is not the CNT structure reality.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Percolation Threshold Simulation for Individual and Hybrid Nanocomposites of Carbon Nanotubes and Carbon Black

2017

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Modeling electrical conductivity of polymer composites with conductive fillers has great applicability to predict conductive materials behavior. In this study, the electrical behavior of simple and hybrid systems prepared from Carbon Black (CB) and Carbon Nanotubes (CNT) was studied.There have been few advances reported in the literature regarding the modeling of hybrid systems, which motivated the development of this study. More specifically, a program was developed with the intention to describe the electric percolation threshold and the effect of synergism between the conductive fillers. Simulation was performed using the Monte Carlo method and Fortran programming language, considering concentration and geometry of conductive fillers to the system in two dimensions. Finally, simulation results were compared with the experimental results and this method proved to be effective in predicting the systems percolation threshold, being an important contribution to predict material behavior, which allows reducing the number of samples to be prepared in an experimental study.

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Section: Simulation Of Composite With Carbon Nanotubesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of Percolation Threshold Simulation for Individual and Hybrid Nanocomposites of Carbon Nanotubes and Carbon Black

2017

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“…Very limited information is instead available on the effect of carbon-based nanofillers on the cure reaction of UP resins, although the employment of this kind of fillers in an UP matrix has great potential on modifying the electrical, thermal and mechanical behaviour of the unfilled systems [20][21][22][23][24][25][26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

Monti

Puglia

Natali

et al. 2011

Composites Science and Technology

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Please cite this article as: Monti, M., Puglia, D., Natali, M., Torre, L., Kenny, J.M., Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: thermal and chemorheological modelling, Composites Science and Technology (2011), doi: 10.1016/j.compscitech.2011 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. AbstractWe report the study of the effects of carbon nanofibers (CNFs) on the cure kinetics and on the chemorheology of unsaturated polyester resins (UP). Two main experimental techniques were utilized: differential scanning calorimetry and rheometry. Isothermal and dynamic tests were performed on the neat polyester resin and on two nanocomposite systems, with 0.5 and 1.0 wt% of CNFs. Furthermore, a TGA study of the selected systems at different isothermal temperatures was performed to evaluate the styrene consumption and related loss rate during the curing process. Subsequently, a phenomenological model (autocatalytic approach) was applied to the experimental data, both in isothermal and dynamic conditions. In the case of dynamic curing, the evidence of multiple peaks in the heat flow curves was studied through the deconvolution of the overall reaction thermogram in single reaction steps. An empirical rheological model coupled with the reaction kinetics was successfully applied to simulate the viscosity changes of the UP matrix. Experimental and modelling results demonstrate the presence of a delay effect of the CNFs on the cure of the UP resin matrix.

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“…Com base nas Equações 8, 9 e 10 outros autores [84,85] desenvolveram estudos que tomaram como base o modelo do volume excluído [26,82] e a adequação da geometria da Figura 3. Celzard et al [84] propuseram um modelo pela variação de diferentes ângulos de orientação das cargas, confirmando que para o valor de θ = π/2 e <sen(θ)>≈ π/4, o menor da fração crítica mostrou-se 0,58 < φ C < 1,15.…”

Section: Modelo Do Volume Excluídounclassified

Modelos de percolação elétrica aplicados para compósitos poliméricos condutores

Coelho

Morales

2017

Polímeros

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AesumoO presente artigo apresenta a aplicação e adequação dos modelos de percolação elétrica em trabalhos experimentais e teóricos da literatura para compósitos poliméricos condutores. Foi realizado um levantamento das publicações referentes aos modelos estudados para os diferentes tipos de cargas condutoras mais aplicadas na preparação destes compósitos, tais como pós metálicos, grafite, negro de fumo, nanofibras e nanotubos de carbono. A discussão está apresentada quanto à adequação dos modelos ao comportamento dos compósitos na influência das cargas nas propriedades elétricas de matrizes poliméricas. Palavras-chave: compósitos poliméricos, condutividade elétrica, modelos de percolação. AbstractThis paper presents the application and adjustment of electrical percolation models in conductive polymer composites. Different models have been proposed for different types of conductive fillers applied in composites preparation, such as metal powders, graphite, black carbon, carbon nanotubes and nanofibers. The discussion was carried out considering the consistency of the model on the behavior of these fillers and their influence on the electrical properties of polymer matrices.Keywords: polymer composites, electrical conductivity, percolation models. IntroduçãoA incorporação de partículas eletricamente condutoras em uma matriz isolante polimérica é um exemplo importante da modificação de materiais em áreas até então restrita aos metais, tais como, piezo elétricos [1] , adesivos condutivos [2] , roupas e artigos antiestáticos [3] , blindagem eletromagnética [4] e sensores químicos [5] . A esta classe de materiais é dada a denominação de compósitos condutores poliméricos que apresentam muitas vantagens em comparação aos metais, como por exemplo, resistência à corrosão, menor densidade, processabilidade e custo [6] .A adição de cargas eletricamente condutoras, tais como, partículas metálicas [7][8][9] , nanofolhas de grafite [10][11][12] , negro de fumo (NF) [13,14] e nanotubos de carbono (NTC) [15][16][17][18] em uma resina polimérica isolante tem sido o principal recurso para a obtenção de compósitos condutores. Entre estas cargas destacam-se os NTC por seu potencial na obtenção de sistemas nanoestruturados altamente condutores com excelentes propriedades mecânicas [17,18] . A principal questão sobre os nanocompósitos poliméricos condutores está relacionada com a variação da condutividade em função da concentração das partículas condutoras, onde se observa existir uma concentração crítica a partir da qual ocorre um aumento na condutividade do sistema. Este fenômeno pode ser explicado pela teoria da percolação.Vários modelos matemáticos foram desenvolvidos para descrever o fenômeno de percolação e uma revisão abrangente foi feita por Lux 1993 [19] , considerando fatores estruturais micrométricos dos sistemas. Desde então, estes modelos continuam a ser aplicados e discutidos. Mais recentemente, destaca-se a importância de novos materiais obtidos a partir de cargas cujas dimensões são nanométricas.Bauhofer e Kovacs [20] ...

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Electrical Conduction and Percolation Behavior of Carbon Nanotubes/UPR Nanocomposites

Abstract: The carbon nanotubes(CNT)/Unsaturated polyester resin (UPR) nanocomposites are

Cited by 29 publications

References 18 publications

Assessment of Percolation Threshold Simulation for Individual and Hybrid Nanocomposites of Carbon Nanotubes and Carbon Black

Assessment of Percolation Threshold Simulation for Individual and Hybrid Nanocomposites of Carbon Nanotubes and Carbon Black

Effect of carbon nanofibers on the cure kinetics of unsaturated polyester resin: Thermal and chemorheological modelling

Modelos de percolação elétrica aplicados para compósitos poliméricos condutores

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