A Carbon Nanotubes Aggregation in Polymer Nanocomposites

2018 ◽  
Vol 935 ◽  
pp. 55-60 ◽  
Author(s):  
Louise B. Atlukhanova ◽  
George V. Kozlov

Carbon nanotubes aggregation process in aggregates (bundles) has been studied. This process results in essential reduction of nanocomposites attainable elasticity modulus. The bundles packing density is defined by aggregation expectation time and corresponding carbon nanotube walk dimension up to sticking with a similar nanotube.

Author(s):  
Reza Moheimani ◽  
M Hasansade

This paper describes a closed-form unit cell micromechanical model for estimating the effective thermal conductivities of unidirectional carbon nanotube reinforced polymer nanocomposites. The model incorporates the typically observed misalignment and curvature of carbon nanotubes into the polymer nanocomposites. Also, the interfacial thermal resistance between the carbon nanotube and the polymer matrix is considered in the nanocomposite simulation. The micromechanics model is seen to produce reasonable agreement with available experimental data for the effective thermal conductivities of polymer nanocomposites reinforced with different carbon nanotube volume fractions. The results indicate that the thermal conductivities are strongly dependent on the waviness wherein, even a slight change in the carbon nanotube curvature can induce a prominent change in the polymer nanocomposite thermal conducting behavior. In general, the carbon nanotube curvature improves the nanocomposite thermal conductivity in the transverse direction. However, using the straight carbon nanotubes leads to maximum levels of axial thermal conductivities. With the increase in carbon nanotube diameter, an enhancement in nanocomposite transverse thermal conductivity is observed. Also, the results of micromechanical simulation show that it is necessary to form a perfectly bonded interface if the full potential of carbon nanotube reinforcement is to be realized.


2018 ◽  
Vol 30 (3) ◽  
pp. 463-478 ◽  
Author(s):  
MK Hassanzadeh-Aghdam ◽  
MJ Mahmoodi ◽  
R Ansari ◽  
A Darvizeh

The effects of interphase characteristics on the elastic behavior of randomly dispersed carbon nanotube–reinforced shape memory polymer nanocomposites are investigated using a three-dimensional unit cell–based micromechanical method. The interphase region is formed due to non-bonded van der Waals interaction between a carbon nanotube and a shape memory polymer. The influences of temperature, diameter, volume fraction, and arrangement type of carbon nanotubes within the matrix as well as two interphase factors, including adhesion exponent and thickness on the carbon nanotube/shape memory polymer nanocomposite’s longitudinal and transverse elastic moduli, are explored extensively. Moreover, the results are presented for the shape memory polymer nanocomposites containing randomly oriented carbon nanotubes. The obtained results clearly demonstrate that the interphase region plays a crucial role in the modeling of the carbon nanotube/shape memory polymer nanocomposite’s elastic moduli. It is observed that the nanocomposite’s elastic moduli remarkably increase with increasing interphase thickness or decreasing adhesion exponent. It is found that when the interphase is considered in the micromechanical simulation, the shape memory polymer nanocomposite’s elastic moduli non-linearly increase as the carbon nanotube diameter decreases. The predictions of the present micromechanical model are compared with those of other analytical methods and available experiments.


ACS Nano ◽  
2011 ◽  
Vol 5 (6) ◽  
pp. 4818-4825 ◽  
Author(s):  
Amy M. Marconnet ◽  
Namiko Yamamoto ◽  
Matthew A. Panzer ◽  
Brian L. Wardle ◽  
Kenneth E. Goodson

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1047 ◽  
Author(s):  
Yasser Zare ◽  
Kyong Yop Rhee

In the present work, a simple simulation is advanced based on a Callister equation considering the impacts of interphase and carbon nanotube (CNT) nets on the strength of nanocomposites after percolation onset. The advanced model can analyze the strength of nanocomposite by filler aspect ratio (α), percolation beginning ( φ p ), interphase depth (t), interphase power (σi), net density (N), and net power (σN). The empirical consequences of several samples agree with the estimations of the industrialised model. The nanocomposite strength straightly depends on “α”, “t”, “σi”, “N”, and “σN”, while the radius and percolation onset of CNT play the inverse characters. The reasonable impacts of net and interphase possessions on the nanocomposite strength rationalise the accurate progress of the Callister equation.


2016 ◽  
Vol 3 (3) ◽  
pp. 545-558 ◽  
Author(s):  
David G. Goodwin ◽  
Z. Xia ◽  
T. B. Gordon ◽  
C. Gao ◽  
E. J. Bouwer ◽  
...  

Carbon nanotube/polymer nanocomposite surfaces impact biofilm development through the cytotoxic effect of exposed carbon nanotubes on microorganisms.


2017 ◽  
Vol 51 (20) ◽  
pp. 2899-2912 ◽  
Author(s):  
MK Hassanzadeh-Aghdam ◽  
R Ansari ◽  
A Darvizeh

A comprehensive investigation is carried out into the elastic behavior of carbon nanotube-reinforced polymer nanocomposites using two combined analytical micromechanical methods. A unit cell-based micromechanical method is developed to model the random distribution of carbon nanotubes within the polymer matrix. Also, the Eshelby method is used for modeling the random orientation state of carbon nanotubes within the matrix. Two fundamental aspects affecting the mechanical behavior of carbon nanotube/polymer nanocomposites, including the carbon nanotube waviness and the interphase formed due to the non-boned interaction between the carbon nanotube and the surrounding polymer, are considered in the unit cell method. Comparisons between the results of present method and experimental data reveal that for more realistic predictions, five important factors including, random orientation and random distribution of carbon nanotubes, interphase, waviness and transversely isotropic behavior of carbon nanotube should be considered in the modeling of carbon nanotube-reinforced polymer nanocomposites. The effects of volume fraction, number of waves and waviness factor of carbon nanotube as well as the type of random distribution of CNTs within the matrix on the elastic modulus of the polymer nanocomposites are studied.


Author(s):  
Luiza В. Atlukhanova ◽  
Igor V. Dolbin ◽  
Georgii V. Kozlov

Целью настоящей работы является раздельное определение модуля упругос-ти компонент нанокомпозитов полидициклопентандиен/многослойные углеродные на-нотрубки, а именно, нанонаполнителя и межфазных областей. Для достижения этой целииспользована микромеханическая модель.Выполненные оценки продемонстрировали, что модуль упругости углеродных нанотрубокв полимерной матрице нанокомпозита, т. е., их агрегатов, приблизительно на два поряд-ка меньше номинальной величины этого параметра для отдельной углеродной нанотруб-ки, тогда как модуль упругости межфазных областей примерно в два раза выше модуляупругости матричного полимера. Эти данные ясно демонстрируют некорректность при-менения номинальных характеристик нанонаполнителя, в частности, его модуля упру-гости, для определения соответствующих показателей нанокомпозита. Однако использо-вание реальных величин модуля упругости агрегатов углеродных нанотрубок в рамкахпростого правила смесей позволяет достаточно точное описание этого параметра в случаенанокомпозитов. Важно отметить, что модуль упругости углеродных нанотрубок в элас-томерной матрице существенно меньше этого параметра в стеклообразной матрице дляодного и того же нанокомпозита. Это означает, что указанный параметр определяется нетолько размерами и структурой агрегатов нанонаполнителя, но также и другими факто-рами, в частности, жесткостью окружающей агрегат полимерной матрицы, эффективнос-тью переноса приложенного к образцу механического напряжения от полимерной мат-рицы к нанонаполнителю и т. п.Применение модифицированного правила смесей для описания модуля упругости нано-композитов показало, что включенный в него, так называемый, фактор эффективностидлины в случае анизотропного нанонаполнителя существенно меньше (на несколькопорядков) рассчитанного теоретически для углеродных нанотрубок, что особенно очевид-но выражено в случае нанокомпозитов с эластомерной матрицей.В качестве вывода укажем, что модуль упругости компонент нанокомпозита являетсясильной функцией их фазового состояния, а определение реальных характеристик этихкомпонент позволяет корректное применение простого правила смесей.       ЛИТЕРАТУРА1. Moniruzzaman M., Winey K.I. Polymer nanocomposites containing carbon nanotubes // Macromolecules,2006, v. 39(16), p. 5194. DOI: https://doi.org/10.1021/ma060733p2. Schaefer D. W., Justice R. S. How nano are nanocomposites? // Macromolecules, 2007, v. 40(24), p. 8501.DOI: https://doi.org10.1021/ma070326w3. Coleman J. N., Cadek M., Ryan K. P., Fonseca A., Nady J. B., Blau W. J., Ferreira M. S. Reinforcement ofpolymers with carbon nanotubes. The role of an ordered polymer intwrfacial region. Experimental andmodeling // Polymer, 2006, v. 47(23), pp. 8556–8561. DOI: https://doi.org/10/1016/j.polymer.2006.10.0144. Kozlov G. V., Yanovskii Yu. G., Zaikov G. E. Particulate-Filled Polymer Nanocomposites. Structure,Properties, Perspectives. New York, Nova Science Publishers, Inc., 2014. DOI: https://doi.org/10.1002/9783527644346.ch35. Mikitaev A. K., Kozlov G. V., Zaikov G. E. Polymer Nanocomposites: Variety of Structural Forms and Applications.New York, Nova Science Publishers, Inc., 2008.6. Jeong W., Kessler M.R. Toughness enhancement in ROMP functionalized carbon nanotube/polydicyclopentadienecomposites. Chem. Mater., 2008. v. 20(22), р. 7060. DOI: https://doi.org/10.1021/cm80209477. Koerner H., Liu W., Alexander M., Mirau P., Dowty H., Vaia R. A. Deformation – morphology correlationsin electrically conductive carbon nanotube – thermoplastic polyurethane nanocomposites // Polymer, 2005, v. 46(12), р. 4405. DOI: https://doi.org/10.1016/j.polymer.2005.02.0258. Ahmed S., Jones F. R. A review of particulate reinforcement theories of polymer composites // J.Mater. Sci., 1990, v. 25(12), pp. 4933–4942. DOI: https://doi.org/10.1007/bf005801109. Aygubova A. Ch., Kozlov G. V., Magomedov G. M., Zaikov G. E. The elastic modulus of carbon nanotubeaggregates in polymer nanocomposites. J. Characterization and Development of Novel Mater., 2016, v. 8(3), p. 227.10. Khan U., May P., O’Neill A., Bell A.P., Boussac E., Martin A., Semple J., Coleman J. N. Polymer reinforcementusing liquid-exfoliated boron nitride nanosheets // Nanoscale, 2013, v. 5(3), pp. 581-587. DOI: https://doi.org/10.1039/c2nr33049k


RSC Advances ◽  
2015 ◽  
Vol 5 (64) ◽  
pp. 51621-51630 ◽  
Author(s):  
S. V. Larin ◽  
A. D. Glova ◽  
E. B. Serebryakov ◽  
V. M. Nazarychev ◽  
J. M. Kenny ◽  
...  

The structural properties of polymer nanocomposites based on thermoplastic polyimides filled with surface-modified carbon nanotubes (CNT) have been studied by means of fully-atomistic molecular-dynamics simulations.


2019 ◽  
Vol 2019 ◽  
pp. 1-24 ◽  
Author(s):  
Junjie Chen ◽  
Xuhui Gao ◽  
Deguang Xu

The current state of characterization techniques for the interface in carbon nanotube-reinforced polymer nanocomposites is reviewed. Different types of interfaces that exist within the nanocomposites are summarized, and current efforts focused on understanding the interfacial properties and interactions are reviewed. The emerging trends in characterization techniques and methodologies for the interface are presented, and their strengths and limitations are summarized. The intrinsic mechanism of the interactions at the interface between the carbon nanotubes and the polymer matrix is discussed. Special attention is given to research efforts focused on chemical functionalization of carbon nanotubes. The benefits and disadvantages associated with covalent and noncovalent functionalization methods are evaluated, respectively. Various techniques used to characterize the properties of the interface are extensively reviewed. How the mechanical and thermal properties of the nanocomposites depend on the physical and chemical nature of the interface is also discussed. Better understanding and design of the interface at the atomic level could become the forefront of research in the polymer community. Potential problems going to be solved are finally highlighted.


Sign in / Sign up

Export Citation Format

Share Document