scholarly journals Study of The Phenomena of Surface Discharges and Flashover in Nanocomposite Epoxy Resin under the Influence of Homogeneous Electric Fields

2019 ◽  
Vol 9 (4) ◽  
pp. 4315-4321 ◽  
Author(s):  
M. Danikas ◽  
D. Verginadis ◽  
R. Sarathi
Keyword(s):  
Epoxy Resin ◽  
Polymer Nanocomposites ◽  
Electric Fields ◽  
Polymer Nanocomposite ◽  
Nanocomposite Materials ◽  
Thermal And Mechanical Properties ◽  
Insulating Materials ◽  
New Class ◽  
The Past ◽  
Surface Discharges

A new class of insulating materials is the class of polymer nanocomposites. In the past twenty-five years, a lot of attention was paid to the various electrical, thermal and mechanical properties of polymer nanocomposite materials. In the present work, epoxy resin samples without and with nanoparticles (0 wt%, 1 wt%, 3 wt%, 5 wt%, and 10 wt%) are investigated regarding the surface discharges and the flashover voltages. Four different water droplet arrangements were used, with eight different water conductivities in order to see the effect of the nanoparticle.

scholarly journals Progress in Biodegradable Flame Retardant Nano-Biocomposites

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 741
Author(s):  
Zorana Kovačević ◽  
Sandra Flinčec Grgac ◽  
Sandra Bischof
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Circular Economy ◽  
Nanocomposite Materials ◽  
Thermal And Mechanical Properties ◽  
Specific Group ◽  
New Class ◽  
Research Initiatives ◽  
Positive Properties

This paper summarizes the results obtained in the course of the development of a specific group of biocomposites with high functionality of flame retardancy, which are environmentally acceptable at the same time. Conventional biocomposites have to be altered through different modifications, to be able to respond to the stringent standards and environmental requests of the circular economy. The most commonly produced types of biocomposites are those composed of a biodegradable PLA matrix and plant bast fibres. Despite of numerous positive properties of natural fibres, flammability of plant fibres is one of the most pronounced drawbacks for their wider usage in biocomposites production. Most recent novelties regarding the flame retardancy of nanocomposites are presented, with the accent on the agents of nanosize (nanofillers), which have been chosen as they have low or non-toxic environmental impact, but still offer enhanced flame retardant (FR) properties. The importance of a nanofiller’s geometry and shape (e.g., nanodispersion of nanoclay) and increase in polymer viscosity, on flame retardancy has been stressed. Although metal oxydes are considered the most commonly used nanofillers there are numerous other possibilities presented within the paper. Combinations of clay based nanofillers with other nanosized or microsized FR agents can significantly improve the thermal stability and FR properties of nanocomposite materials. Further research is still needed on optimizing the parameters of FR compounds to meet numerous requirements, from the improvement of thermal and mechanical properties to the biodegradability of the composite products. Presented research initiatives provide genuine new opportunities for manufacturers, consumers and society as a whole to create a new class of bionanocomposite materials with added benefits of environmental improvement.

Flexible Epoxy Syntactic Foam Thermal Insulation for High Temperature Deepsea Reelable Pipelay Installations

2010 ◽  
Author(s):  
Wen-Tsuen Wang ◽  
Lou Watkins
Keyword(s):  
High Temperature ◽  
Sea Water ◽  
Syntactic Foam ◽  
Preliminary Test ◽  
Great Depth ◽  
Offshore Pipelines ◽  
Insulating Materials ◽  
New Class ◽  
The Past ◽  
Offshore Industry

Epoxy syntactic foam, a composite material combining glass microspheres with other fillers in an epoxy binder, has been used with increasing success in insulating offshore pipelines and subsea equipment for the past decade or more. The advantages of epoxy include excellent resistance to high temperature and high pressure sea water as well as good thermal insulting properties. The exceptional strength of epoxy has made service at great depth possible. However, the rigidity of conventional epoxy-based material has so far limited its application to subsea equipment and J-Lay or S-Lay pipelines. As the offshore industry moves into deeper water and larger fields, the desirability of making advanced epoxy insulation flexible and extending its use to more efficient reeled deployment methods is becoming obvious. This paper describes research directed toward identifying new, highly flexible insulating materials suitable for service up to 300°F (150°C) and as deep as 10,000 ft (3000m). A critical part of the research program has been to develop a methodology for testing affording confidence for very long periods of service. Preliminary test data are presented, along with predictions of how this new class of products will be further developed.

scholarly journals Experimental Dielectric Measurements for Cost-fewer Polyvinyl Chloride Nanocomposites

2015 ◽  
Vol 5 (1) ◽  
pp. 13 ◽  
Author(s):  
Ahmed Thabet ◽  
Youssef Mobarak
Keyword(s):  
Dielectric Loss ◽  
Polymer Nanocomposites ◽  
Polyvinyl Chloride ◽  
Fumed Silica ◽  
Nanocomposite Materials ◽  
Power Cables ◽  
Dielectric Measurements ◽  
Insulating Materials ◽  
Composite Systems ◽  
Host Polymer

<span>Polymer nanocomposites possess promising high performances as engineering materials, if they are prepared and fabricated properly. In this research, it has been processed samples of nanocomposite polymers as electrical insulating materials for application on the electric power cables by using the latest techniques of nanotechnology. This paper has been investigated enhanced dielectric and electrical properties of Polyvinyl chloride PVC as matrix have shown that trapping properties are highly modified by the presence of costless nanofillers clay and fumed silica. An experimental work for dielectric loss and capacitance of the new nanocomposite materials have been investigated and compared with unfilled industrial materials. It is found that a good correlation exists in respect of capacitance and dielectric loss values measured with percentage of nanofillers. Thus, it has been investigated the influence of costless nanofillers material and its concentration on dielectric properties of industrial polymers-based composite systems. A comparative study is performed between the unfilled base polymers, the systems containing one type of nanoparticles clay<em><span> </span></em>or fumed silica inside the host polymer with various concentrations.</span>

scholarly journals Electrical Treeing in Polymer Nanocomposites

2009 ◽  
Vol 10 (2) ◽  
Author(s):  
Sridhar Alapati ◽  
M. Joy Thomas
Keyword(s):  
Epoxy Resin ◽  
Polymer Nanocomposites ◽  
Tree Growth ◽  
Polymer Nanocomposite ◽  
Growth Patterns ◽  
Nano Silica ◽  
Electrical Tree ◽  
Base Polymer ◽  
Time Required ◽  
Electrical Treeing

This paper presents a study of electrical treeing phenomena in polymer nanocomposites. The polymer nanocomposite studied consists of epoxy resin as base polymer and silica as nano filler. Treeing experiments were performed at a constant ac voltage of 20kV, 50Hz on epoxy samples without any fillers as well as epoxy silica nano composites with 1% by weight of nano silica. Times for tree inception as well as tree growth patterns were studied. The results show that addition of small amount (1% by weight) of nano silica particles in epoxy resin can improve the treeing resistance by delaying the tree inception time as well as the time required by the tree to reach the opposite electrode. Treeing phenomena has been analyzed and interpreted by a physical model to explain the behavior in nanocomposites. The nature of bonding at the interface between epoxy and nano filler is characterized by using FTIR spectrometry. It has been shown that the type of bonding at the interface has an influence on the electrical tree growth pattern.

A Review on Effect of Nanoreinforcement on Mechanical Properties of Polymer Nanocomposites

2018 ◽  
Vol 280 ◽  
pp. 284-293 ◽  
Author(s):  
M.N. Ervina Efzan ◽  
N. Siti Syazwani
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Polymer Nanocomposites ◽  
Polymer Matrix ◽  
Functional Performance ◽  
Polymer Nanocomposite ◽  
Filled Polymers ◽  
Performance Properties ◽  
New Class ◽  
Potential Use

Polymer nanocomposites represent a new class of materials that offer an alternative to the conventional filled polymers. In this new class of materials, nanosized reinforcement are dispersed in polymer matrix offering tremendous improvement in performance properties of the polymer. The combination of nanoscale reinforcement and polymer matrix possess outstanding properties and functional performance which play an important role in many field of applications. This review addresses the types of nanoscale materials reinforced in polymer matrix such as nanocellulose, carbon nanotubes (CNTs), graphene, nanofibers and nanoclay followed by the discussion on the effect of these nanoscale reinforcement on mechanical properties of polymer nanocomposites. Besides, the potential use of polymer nanocomposite reinforced with those nanoscale reinforcements in various field of applications also discussed.

scholarly journals A Short Review on Polymer Nanocomposites for Enameled Wires: Possibilities and Perspectives

2019 ◽  
Vol 9 (3) ◽  
pp. 4079-4084
Author(s):  
M. Danikas ◽  
S. Morsalin
Keyword(s):  
Mechanical Properties ◽  
Polymer Nanocomposites ◽  
High Voltage ◽  
Past Research ◽  
Short Review ◽  
Thermal And Mechanical Properties ◽  
Insulating Materials ◽  
New Generation

Polymer nanocomposites constitute a new generation of insulating materials, capable of offering better electrical, thermal and mechanical properties. Past research indicated that such materials may replace conventional polymers for a variety of industrial high voltage applications. In the present paper, polymer nanocomposites are investigated regarding the insulation of enameled wires. Possible nanocomposite candidates are discussed.

scholarly journals Self-Healing Polymer Nanocomposite Materials by Joule Effect

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 649
Author(s):  
Jaime Orellana ◽  
Ignacio Moreno-Villoslada ◽  
Ranjita K. Bose ◽  
Francesco Picchioni ◽  
Mario E. Flores ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Materials Science ◽  
Conductive Polymer ◽  
Polymer Nanocomposite ◽  
Nanocomposite Materials ◽  
Comprehensive Analysis ◽  
Functionalized Polymers ◽  
Self Healing ◽  
Joule Effect ◽  
Conductive Nanocomposites

Nowadays, the self-healing approach in materials science mainly relies on functionalized polymers used as matrices in nanocomposites. Through different physicochemical pathways and stimuli, these materials can undergo self-repairing mechanisms that represent a great advantage to prolonging materials service-life, thus avoiding early disposal. Particularly, the use of the Joule effect as an external stimulus for self-healing in conductive nanocomposites is under-reported in the literature. However, it is of particular importance because it incorporates nanofillers with tunable features thus producing multifunctional materials. The aim of this review is the comprehensive analysis of conductive polymer nanocomposites presenting reversible dynamic bonds and their energetical activation to perform self-healing through the Joule effect.

scholarly journals Editorial for the Special Issue “Polymeric and Polymer Nanocomposite Materials for Photonic Applications”

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3036
Author(s):  
Sergi Gallego ◽  
Yasuo Tomita
Keyword(s):  
Polymer Nanocomposites ◽  
Polymer Nanocomposite ◽  
Nanocomposite Materials ◽  
Nanometer Scale ◽  
Special Issue

Polymer nanocomposites are designed and engineered on a nanometer scale with versatile applications including optics and photonics [...]

scholarly journals Depth Mapping of Metallic Nanowire Polymer Nanocomposites by Scanning Dielectric Microscopy

Nanoscale ◽  
2021 ◽  
Author(s):  
Harishankar Balakrishnan ◽  
Rubén Millán ◽  
Marti Checa ◽  
Rene Fabregas ◽  
Laura Fumagalli ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Polymer Nanocomposite ◽  
Nanocomposite Materials ◽  
Metallic Nanowires ◽  
Flexible Electrodes ◽  
Stretchable Conductors

Polymer nanocomposite materials based on metallic nanowires are widely investigated as transparent and flexible electrodes or as stretchable conductors and dielectrics for biosensing. Here we show that Scanning Dielectric Microscopy...

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