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Apparatus and process for the surface treatment of carbon fibers

a technology of carbon fiber and surface treatment, which is applied in the direction of chemical vapor deposition coating, synthetic resin layered products, natural mineral layered products, etc., can solve the problems of circumventing many of the costly and environmentally harmful shortcomings inherent in electrochemical treatment methods, and achieves the effects of improving the adhesion of fibers, increasing surface atomic oxygen content, and increasing the level of surface functional groups

Inactive Publication Date: 2013-08-01
UT BATTELLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a process for surface treatment of carbon-containing objects, such as fibers, by gas phase oxidation. This process can improve the adhesion of the fiber to a polymeric matrix in the manufacture of composite materials. It increases the surface atomic oxygen content, which leads to better interaction and bonding between the fiber and polymer. The method is cost-effective and environmentally friendly as it uses ozone in a controlled manner without damaging the fiber. The carbon-containing material is processed in a flowing gas stream containing ozone, resulting in a high level of surface atomic oxygen content and favorable interaction with the surface. The method also eliminates the need for costly and environmentally detrimental shortcomings of electrochemical treatment methods. The resulting carbon-containing material has a high surface atomic oxygen content and is not damaged and free of defects. It can also be further functionalized with a sizing agent, such as an epoxy sizing agent, which permits a greater bonding with the carbon fiber surface.

Problems solved by technology

Moreover, the method described herein circumvents many of the costly and environmentally detrimental shortcomings inherent in electrochemical treatment methods.

Method used

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  • Apparatus and process for the surface treatment of carbon fibers
  • Apparatus and process for the surface treatment of carbon fibers
  • Apparatus and process for the surface treatment of carbon fibers

Examples

Experimental program
Comparison scheme
Effect test

example 1

Processing of Carbon Fiber

Experiment A

[0068]In this experiment, the carbon fiber was in the form of a 50,000 filament tow. Carbon fibers were drawn continuously through a heated Pyrex® glass circular tubular reactor having an internal diameter (ID) of 1.5 inches (1.5″) and a length of 60 inches (total reactor volume of 105.98 cubic inches). Approximately 9 wt % ozone gas was supplied from the middle top of the tube. The residence time for the carbon fiber in the reactor was about 90 seconds. The flow rate of the carrier gas was set at 2 lt / min (122.04 cubic inches / min). Thus, the approximate reactor renewal time was 0.868 minutes. A general schematic of the apparatus and process is shown in FIG. 1.

[0069]Using the above system, ozone decomposition kinetics and distribution were analyzed by varying the processing temperature. FIG. 2 is a chart plotting observed relative ozone concentration to relative distance from the ozone injection port. A relative distance of 1.00 is taken as the ...

experiment b

[0070]The dimensions of the reactor and materials used in the reactor also have a significant effect on the kinetics and distribution of ozone decomposition. This example employed a metal 5″ by 5″ reactor in the tubular reactor of 60″ length as fibers moved through the center portion of the reactor. Ozone and air densities were 2.14 kg / m3 and 1.29 kg / m3, respectively. Due to the heavy nature of ozone molecules, they tend to accumulate at the bottom of the reactor. Although the proper balance of ozone decomposition may be achieved, the generated active species may not react with the carbon fiber effectively if most of the reaction is occurring below the area where the fibers move. This results in poor surface treatment.

[0071]Regarding the dimensions of the reactor, a reduced interaction between carbon fiber surfaces and ozone was observed in larger diameter tubes, particularly those having a diameter greater than three inches. More optimal results were observed using a circular glass...

experiment c

[0072]In this experiment, carbon fiber was in the form of a 50,000 filament tow. Carbon fibers were drawn continuously through a heated Pyrex® glass circular tubular reactor having an internal diameter (ID) of 3 inches (3″) and a length of 120 inches. Approximately 7 wt % ozone gas was supplied from both the bottom and the top every 24″ along the length of the reactor (8 individual ozone supply injection ports). The residence time for the carbon fiber in the reactor was about 90 seconds. The overall flow rate of the carrier gas was set at 10 lt / min, distributed equally among the 8 injection ports. This equated to a reactor renewal rate of 1.39 minutes. A uniform 160° C. temperature profile was maintained during the experiment. The apparatus and process is similar to that depicted in FIG. 1, except where indicated.

[0073]The atomic composition of the surface of the processed fibers, as measured by XPS, is shown in Table 1 below:

TABLE 1Atomic composition of the surface of processed car...

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Abstract

A method for surface treating a carbon-containing material in which carbon-containing material is reacted with decomposing ozone in a reactor (e.g., a hollow tube reactor), wherein a concentration of ozone is maintained throughout the reactor by appropriate selection of at least processing temperature, gas stream flow rate, reactor dimensions, ozone concentration entering the reactor, and position of one or more ozone inlets (ports) in the reactor, wherein the method produces a surface-oxidized carbon or carbon-containing material, preferably having a surface atomic oxygen content of at least 15%. The resulting surface-oxidized carbon material and solid composites made therefrom are also described.

Description

[0001]This invention was made with government support under Prime Contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in the invention.FIELD OF THE INVENTION[0002]The present invention relates, generally, to the manufacture and surface treatment of carbon fibers, and their composite materials.BACKGROUND OF THE INVENTION[0003]Carbon fiber reinforced polymer composites are known for their outstanding mechanical properties with a low density. Some of their outstanding mechanical properties include superior shear properties and impact resistance. For this reason, they have been of interest to many fields, particularly for rugged applications, such as the space and aeronautics industries, military equipment, transportation, and infrastructure.[0004]However, a key deficiency in these composite materials has been an insufficient adhesion of the carbon fibers to the polymer matrix. In turn, the low adhesion has a detrimental effect on t...

Claims

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Application Information

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IPC IPC(8): B32B9/00C01B31/00B32B5/16B32B5/02B05D1/36C07C69/00C07C53/00C07C49/04C08L67/06C09K3/00C08K3/18
CPCC07C49/04Y10T428/2918C08K3/18C08J5/042D06M11/34D06M2101/40C09C1/565C01P2002/85C08J5/06C08J5/24C08J2363/00C08J2367/06C08K3/04Y10T428/2991Y10T428/30C07C53/00Y10T442/20C08J5/243C08J5/248C23C16/40C23C16/455
Inventor PAULAUSKAS, FELIX LEONARDOZCAN, SOYDANNASKAR, AMIT K.
Owner UT BATTELLE LLC
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