scholarly journals HEAT CONDUCTIVITY OF POLYMERIC MICRO- AND NANOCOMPOSITES BASED ON POLYETHYLENE AT VARIOUS METHODS OF THEIR PREPARATION

2017 ◽  
Vol 39 (4) ◽  
pp. 21-26
Author(s):  
N. M. Fialko ◽  
R. V. Dinzhos ◽  
Yu. V. Sherenkovskiy ◽  
N. O. Meranova ◽  
R. A. Navrodskaya
Keyword(s):  
Carbon Nanotubes ◽  
Comparative Analysis ◽  
Concentration Dependence ◽  
Polymer Matrix ◽  
Heat Conductivity ◽  
Aluminum Particles ◽  
Methods Of Synthesis ◽  
Percolation Thresholds

The results of a comparative analysis of the heat conductivity properties of polymer micro- and nanocomposites based on polyethylene obtained using methods based on the mixing of components in a dry form or a melt of a polymer matrix are submitted. For polyethylene, filled with carbon nanotubes and aluminum particles, data on the effect of methods of synthesis of composites on the values of percolation thresholds, the concentration dependence of the coefficients of heat conductivity, etc. are presented.  

scholarly journals Сравнительный анализ эффективности углеродных нанотрубок и графена в армированнии полимерных нанокомпозитов

2020 ◽  
Vol 62 (8) ◽  
pp. 1240
Author(s):  
Г.В. Козлов ◽  
И.В. Долбин
Keyword(s):  
Carbon Nanotubes ◽  
Comparative Analysis ◽  
Polymer Matrix ◽  
Fractal Analysis ◽  
Percolation Theory ◽  
Outer Diameter ◽  
Main Role ◽  
Technological Aspect ◽  
High Modulus ◽  
Reinforcement Efficiency

The comparative analysis of reinforcement efficiency (modulus of elasticity enhancement) of polymers with carbon nanotubes and grapheme was performed using the methods of fractal analysis and percolation theory. It has been shown that such comparison is correct only at the same structure of the indicated anisotropic nanofillers in polymer matrix. For carbon nanotubes reinforcement efficiency depends strongly on their geometry, i.e. length and outer diameter. In addition the main role in polymers reinforcement play not initial characteristics of nanofiller, but its structures, obtained in production process of nanocomposites. In technological aspect carbon nanotubes are more suitable for manufacture of high-modulus nanocomposites, that is due to possibility of simple enough realization of their orientation.

Comprehensive review on carbon nanotubes embedded in different metal and polymer matrix: fabrications and applications

2021 ◽  
pp. 1-28
Author(s):  
Fahad Saleem Ahmed Khan ◽  
N. M. Mubarak ◽  
Mohammad Khalid ◽  
Mohammad Mansoob Khan ◽  
Yie Hua Tan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Polymer Matrix ◽  
Comprehensive Review

Effect of carbon nanotubes modified with different concentrations of rare earth lanthanum on the mechanical and tribological properties of epoxy composites

2021 ◽  
pp. 002199832098764
Author(s):  
Mingren Jiang ◽  
Xianhua Cheng
Keyword(s):  
Carbon Nanotubes ◽  
Rare Earth ◽  
Polymer Matrix ◽  
Photoelectron Spectroscopy ◽  
Polymer Matrix Composites ◽  
Testing Machine ◽  
Matrix Composites ◽  
Mechanical And Tribological Properties ◽  
The Coefficient Of Friction ◽  
The Rare Earth

Rare earth modified acidified carbon nanotubes were prepared by functionalization of acidified carbon nanotubes with different concentrations of LaCl3. The modification results were characterized by Fourier-transform infrared and X-ray photoelectron spectroscopy. The rare earth successfully increases the surface activity of the acidified carbon nanotubes. Polymer matrix composites were prepared by using the rare earth modified acidified carbon nanotubes as the reinforcement in epoxy matrix. Mechanical properties were analyzed by Zwick Z100 testing machine and the tribological behaviors were test by multifunctional tribological tester. Compared with pure epoxy (epoxy resin), the mechanical strength of the best composite sample was increased by 50–120%, the coefficient of friction was reduced by 19.4% and the wear rate was reduced by approximately 40 times. The experimental results show that the RE concentration of 0.2–0.3 wt% has the most obvious influence on the properties of polymer composites. The mechanism of rare earth reinforcement in polymer matrix is analyzed and suggested.

Effect of nanofiller on fibre laser drilling quality of carbon fibre reinforced polymer composite laminates

2018 ◽  
Vol 233 (4) ◽  
pp. 857-870
Author(s):  
Dhiraj Kumar ◽  
Kalyan Kumar Singh
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fibre ◽  
Polymer Matrix ◽  
Composite Laminates ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Multi Walled Carbon Nanotubes ◽  
Fibre Reinforced Polymer ◽  
Walled Carbon Nanotubes

Laser machining of carbon fibre reinforced polymer composites is a challenging task due to a significant difference between physical and thermal properties of the constituent materials, i.e. polymer matrix and carbon fibres. This results in extended heat-affected zone (HAZ), taper kerf and poor surface finishing. This paper focuses on an investigation, attempting to minimise the divergence in the decomposition temperature of carbon fibres and epoxy resin by adding multi-walled carbon nanotubes in polymer matrix as a secondary reinforcement. High thermal conductivity of multi-walled carbon nanotubes increases the thermal diffusivity of polymer matrix, which in turn reduces the matrix recession. In addition, laser power and scan speed was also considered as an input parameter and their influence on output responses such as HAZ, taper angle and surface roughness has been studied. To analyse the effect of multi-walled carbon nanotubes on the resultant thermal damage, an innovative technique, i.e. scanning acoustic microscopy was used. This technique provides a ply-by-ply damage analysis. C-scans of the top and bottom surface of the machined holes in the composite were also carried out. Further, micrographs of the holes were taken to analyse the quality of the holes using field-emission scanning electron microscope. The obtained results indicated that HAZ, taper angle and surface roughness of holes decreased by ∼30%, ∼47% and ∼43%, respectively, with 1.5 wt% multi-walled carbon nanotubes doped carbon fibre reinforced polymer laminates, when compared with the results obtained from experiments with neat carbon fibre reinforced polymer composite laminates.

scholarly journals Электропроводность наножидкостей с металлическими частицами

2019 ◽  
Vol 45 (9) ◽  
pp. 36
Author(s):  
В.Я. Рудяк ◽  
А.В. Минаков ◽  
М.И. Пряжников
Keyword(s):  
Particle Size ◽  
Ethylene Glycol ◽  
Electric Conductivity ◽  
Heat Conductivity ◽  
Rheological Characteristics ◽  
Nanoparticle Concentration ◽  
Aluminum Particles

AbstractThe electric conductivity is experimentally studied in nanofluids based on water and ethylene glycol containing copper and aluminum particles. Other properties, such as heat conductivity and rheological characteristics, were evaluated as well. The electric conductivity of nanofluids is shown to increase almost linearly with a nanoparticle concentration, but, unlike the heat conductivity, a gain in electric conductivity is due to a decrease in particle size. In this respect, the mechanisms of electric conductivity and heat conductivity are assumed to have the fundamentally different nature.

scholarly journals Comparative analysis of sorption-active fillers and methods of their introduction into a polymer matrix in the process of spinning fibrous composite materials by a solution aerodynamic method

2021 ◽  
pp. 38-43
Author(s):  
A. V. Genis ◽  
A. V. Kuznetsov ◽  
Yu. P. Nekrasov
Keyword(s):  
Comparative Analysis ◽  
Polymer Matrix ◽  
Fibrous Composite ◽  
Fibrous Materials ◽  
Active Materials ◽  
Test Environment ◽  
Protective Properties ◽  
Composition And Structure ◽  
Method Of Solution ◽  
Properties Of Materials

A comparative analysis of the efficiency of the most common types of adsorbents of various natures in a test environment with high humidity for obtaining filled fibrous sorption-active materials by the method of solution aerodynamic spinning is carried out. The influence of the spinning methods, the composition and structure of the obtained sorption-active filled fibrous materials, the nature of the polymer matrix, and the type of organic test substances on the protective properties of materials has been studied.

scholarly journals FORECASTING THE DIRECTIONS OF MODERNIZATION OF ECONOMIC SECTORS AND REGIONS OF THE COUNTRY DURING THE DEVELOPMENT OF THE EIGHTH TECHNOLOGICAL ORDER

2021 ◽  
Vol 5 (6) ◽  
pp. 23-42
Author(s):  
Valery V. Glushchenko
Keyword(s):  
Comparative Analysis ◽  
Technological Development ◽  
Historical Analysis ◽  
Ecosystem Approach ◽  
Economic Sectors ◽  
Conceptual Approach ◽  
Analysis Theory ◽  
Methods Of Synthesis ◽  
Expert Assessments ◽  
Project Model

The subject of the article is forecasting the directions of modernization of economic sectors and regions of the country during the development of the eighth technological order (ETO); the object of the article is the 8th technological order in the economy of the country; the purpose of the work is to reduce the risks of sustainable development of the economy and society during the formation of the eighth technological order; to achieve this goal, the following tasks are solved: synthesis of a systematic and descriptive model of the 8th technological order (ETO); formation of sectoral system models of scientific and technological development (fuel and energy complex, military-technical sphere, country region); formation of a project model of organizations' activities; comparative analysis of process and subject models of organization functioning; analysis of factors and methods of synthesis of innovative ideas during the formation of the 8th technological order; comparative analysis of three conceptual approaches in the modernization of the economy (theory of technological orders; ecosystem approach; concepts of convergent (nature-like) technologies); description of methods for modeling innovative projects; study of methods for forming an innovative project business plan; scientific methods in the article are historical analysis; theory of technological orders, theory of forecasting and planning, heuristic synthesis, modeling, logical and structural analysis of projects, expert assessments; scientific novelty of the article is determined by: development of methods for forecasting the processes of modernization of economic sectors and regions of the country; comparative analysis of three concepts of modernization (theory of technological orders; ecosystem approach; the concept of the development of nature-like technologies); the development of a conceptual approach to the modernization of large technological systems within the framework of the theory of technological orders.

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