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Conductive plastics made from natural, renewable, environmentally friendly soybeans
May 30, 2007Electrical properties of acrylated epoxidized soybean oil polymers based composites
Polymer matrix composites with carbon black are very interesting materials. This is because the carbon black can be used as filler material and can beneficially modify the electrical and mechanical properties of the used matrixes. The polymer components of these composites are traditionally made using oleo-polymers; however, an alternative is to use natural and renewable sources as soybean oil, linseed oil, sunflower oil, etc.
Polymers derived from those natural oils can be tailored for engineering and aeronautical applications by reinforcing them with natural and synthetic fibers and clays.
Recent work by S. Hernández-López, E. Vigueras-Santiago, J. Mercado-Posadas and V. Sanchez-Mendieta from Universidad Autónoma del Estado de México investigated the electrical properties of composites based on acrylated-epoxidized soybean oil (AESO)-co-butyl methacrylate (BMA) with carbon black (CB).
The composites were obtained by in situ copolymerization of the above-mentioned monomers with Vulcan XC72 CB. Examination of the resultant materials has shown that the transition from the dielectric state to the conductive state could be achieved by:
1. Varying the carbon black concentration in the polymeric matrix
2. Varying the different monomers proportion that conform the polymer matrix
The researchers found that when carbon black concentration is changed the electrical resistivity shows a typical behavior of ordinary conductive polymer composites. However, the electrical percolation threshold for the AESO:BMA system is reached at lower values than those reported for commercial oleo polymer-based composites. These findings could lead to commercial applications of the materials in antistatic shielding materials and solven sensors.
The article is available to view at http://www.azom.com/Details.asp?ArticleID=3821
AZoNetwork
Recent work by S. Hernández-López, E. Vigueras-Santiago, J. Mercado-Posadas and V. Sanchez-Mendieta from Universidad Autónoma del Estado de México investigated the electrical properties of composites based on acrylated-epoxidized soybean oil (AESO)-co-butyl methacrylate (BMA) with carbon black (CB).
The composites were obtained by in situ copolymerization of the above-mentioned monomers with Vulcan XC72 CB. Examination of the resultant materials has shown that the transition from the dielectric state to the conductive state could be achieved by:
1. Varying the carbon black concentration in the polymeric matrix
2. Varying the different monomers proportion that conform the polymer matrix
The researchers found that when carbon black concentration is changed the electrical resistivity shows a typical behavior of ordinary conductive polymer composites. However, the electrical percolation threshold for the AESO:BMA system is reached at lower values than those reported for commercial oleo polymer-based composites. These findings could lead to commercial applications of the materials in antistatic shielding materials and solven sensors.
The article is available to view at http://www.azom.com/Details.asp?ArticleID=3821
AZoNetwork
Composites Current Events and Composites News RSSNanotech in Space: Rensselaer Experiment To Weather the Trials of Orbit
Novel nanomaterials developed at Rensselaer Polytechnic Institute are scheduled to blast off into orbit on November 16 aboard Space Shuttle Atlantis.
Magnetic mixing creates quite a stir
Sandia researchers have developed a process that can mix tiny volumes of liquid, even in complicated spaces.
Berkeley researchers create first hyperlens for sound waves
Ultrasound and underwater sonar devices could "see" a big improvement thanks to development of the world's first acoustic hyperlens. Created by researchers with the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab), the acoustic hyperlens provides an eightfold boost in the magnification power of sound-based imaging technologies.
Police sketch artist evolves
Criminals are having a harder time hiding their faces, thanks to new software that helps witnesses recreate and recognize suspects using principles borrowed from the fields of optics and genetics.
Brown Economists Measure GDP Growth from Outer Space
Measurements of economic growth often fall short for developing countries, particularly in sub-Saharan Africa, and are rarely calculated at all for cities throughout the world. In a new working paper, three Brown University economists suggest a way to improve GDP estimates for such areas by using images of nighttime lights as seen from outer space.
MIT researchers make carbon nanotubes without metal catalyst
Carbon nanotubes - tiny, rolled-up tubes of graphite - promise to add speed to electronic circuits and strength to materials like carbon composites, used in airplanes and racecars.
The guiding of light: A new metamaterial device steers beams along complex pathways
Using a composite metamaterial to deliver a complex set of instructions to a beam of light, Boston College physicists have created a device to guide electromagnetic waves around objects such as the corner of a building or the profile of the eastern seaboard.
Icy Exposure Creates Armored Polymer High Tech Foams
Chemists and engineers at the University of Warwick have found that exposing particular mixtures of polymer particles and other materials to sudden freeze-drying can create a high-tech armored foam that could be used for a number of purposes, including a new range of low power room temperature gas sensors.
Tires made from trees -- better, cheaper, more fuel efficient
Automobile owners around the world may some day soon be driving on tires that are partly made out of trees - which could cost less, perform better and save on fuel and energy.
HIPS fireproof coatings can really take the heat
HIPS coatings can withstand temperatures of over 1000°C compared to current commercial coatings used on building materials and structures which break down at between 150-250°C.
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