Polyethylene that conducts heat, insulates from electricity (page 2)
Conducts heat just as well as most metals, yet remains an electrical insulatorMost polymers ? materials made of long, chain-like molecules ? are very good insulators for both heat and electricity. But an MIT team has found a way to transform the most widely used polymer, polyethylene, into a material that conducts heat just as well as most metals, yet remains an electrical insulator.The new process causes the polymer to conduct heat very efficiently in just one direction, unlike metals, which conduct equally well in all directions. This may make the new material especially useful for applications where it is important to draw heat away from an object, such as a computer processor chip. The work is described in a paper published on March 7 in Nature Materials.The key to the transformation was getting all the polymer molecules to line up the same way, rather than forming a chaotic tangled mass, as they normally do. The team did that by slowly drawing a polyethylene fiber out of a solution, using the finely cont
Polyethylene that conducts heat, insulates from electricity
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CAMBRIDGE, Mass. -- Most polymers -- materials made of long, chain-like molecules -- are very good insulators for both heat and electricity. But an MIT team has found a way to transform the ...
Sun 7 Mar 10 from Science Blog
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