CARBON NANOTUBES FIBER HAVING LOW RESISTIVITY, HIGH MODULUS AND/OR HIGH THERMAL CONDUCTIVITY AND A METHOD OF PREPARING SUCH FIBERS BY SPINNING USING A FIBER SPIN-DOPE
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United States of America Patent
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Dec 11, 2014
app pub date -
Sep 7, 2012
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Sep 7, 2011
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Abstract
Carbon nanotubes (CNT) fibers having a resistivity lower than 120 μΩ*cm are prepared by a wet spinning process including the steps of supplying a spin-dope of carbon nanotubes to a spinneret, extruding the spin-dope through at least one spinning hole in the spinneret to form spun carbon nanotubes fibers, and coagulating the spun carbon nanotubes fibers in a coagulation medium to form coagulated carbon nanotubes fibers. The carbon nanotubes fibers are drawn at a draw ratio higher than 1.0. The carbon nanotubes have a length of at least 0.5 μm. The carbon nanotubes fibers can further have a resistivity lower than 50 μΩ*cm. At the same time, the CNT fibers can have high modulus.
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