Polyolefin-derived carbon fibers containing boron

A polyolefin fiber, carbon fiber technology, applied in the direction of carbon fiber, fiber treatment, fiber type, etc., can solve the problems of reduced tensile strength, high graphitization temperature, and reduced fiber tensile strength.

Inactive Publication Date: 2016-05-18
DOW GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as disclosed in the following references, even when the fibers include boron catalysts, the required graphitization temperature is still very high
In addition, the reference discloses that boron can actually cause a decrease in tensile strength unless heated above 2300°C
[0008] Yawen et al., Materials and Design 36, 728-734 (2012) present data showing that treatment of PAN fibers with treated boric acid causes an increase in Young's modulus after heating to temperatures greater than 1250°C, but The tensile strength of the fiber is reduced unless heated to a temperature exceeding 2300°C

Method used

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  • Polyolefin-derived carbon fibers containing boron
  • Polyolefin-derived carbon fibers containing boron
  • Polyolefin-derived carbon fibers containing boron

Examples

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example

[0041] Polyethylene / 1-octene copolymer (melt index 30; density 0.9550 g / ml; polydispersity 3.0) was melt spun into continuous fiber bundles containing 1700 filaments (tenacity 4.4 g / denier Neil; elongation at break is 8.4%; diameter is 8.2 microns). The tow was sulfonated in a 4 bath continuous process at 25 megapascal (MPa) tension in the first bath and at 15 MPa tension in subsequent baths. Fiber bundles were fed in each bath at a rate corresponding to a residence time of about 60 minutes. The first bath was 20 mole percent (mol %) oleum at 50°C. The second bath was 96 mole percent sulfuric acid at 120°C. The third bath was 96 mole percent sulfuric acid at 140°C. For Comparative Examples A and B, the fourth bath was deionized water, for Examples 1-5 the fourth bath was various concentrations of boric acid (BA) in water and for Example 5 the fourth bath was 0.082 molar phenyl Aqueous solution of boric acid (PBA). The fibers are wound onto bobbins from the fourth bath.

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Abstract

A process includes treating a stabilized polyolefin fiber with a boron source followed by heating the fiber to a temperature 1000 degrees Celsius or higher in an inert atmosphere so as to convert the stabilized polyolefin fiber in to a carbon fiber.

Description

[0001] Statement of Government Interest [0002] This invention is made between The Dow Chemical Company and UT-Batelle, LLC, the operation and management contractor for Oak Ridge National Laboratory operated for the United States Department of Energy Conducted under NFE-10-02991. The government has certain rights in this invention. technical field [0003] The invention relates to a method for preparing carbon fibers. Background technique [0004] Carbon fiber serves an ever-increasing need. World carbon fiber production was 40 kilometric tons (KMT) in 2010 and is expected to grow to 150 KMT in 2020. This growth is forecast to be largely facilitated by industrial grade carbon fiber, where low cost is critical for applications. Traditional methods of making carbon fibers rely on polyacrylonitrile (PAN), which is solution spun into fiber form, oxidized and carbonized. About 50 percent of the cost is related to the cost of the polymer itself and solution spinning. [00...

Claims

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Application Information

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IPC IPC(8): D06M11/82D06M13/51D01F9/21
CPCD01F9/21D06M11/82D06M13/51D06M2101/20D06M2101/40
Inventor B·E·巴尔顿M·J·贝尔J·T·巴顿E·J·胡可坎恩
Owner DOW GLOBAL TECH LLC
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