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Carbon fibre surface energy measurement method

A measurement method, carbon fiber technology, applied in the direction of surface tension analysis, etc., can solve the problems of large capillary effect of bundle filaments, low accuracy of test results, and inability to truly reflect the surface energy of carbon fibers, etc., to achieve accurate carbon fiber surface energy and accuracy High, precise test results

Active Publication Date: 2009-08-19
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the current method of measuring the surface energy of carbon fibers with an infiltration instrument, because the bundle measurement is greatly affected by capillary action, the accuracy of the test results is low, and it cannot be true. The defects of carbon fiber surface energy, and provide a measurement method of carbon fiber surface energy

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  • Carbon fibre surface energy measurement method
  • Carbon fibre surface energy measurement method
  • Carbon fibre surface energy measurement method

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specific Embodiment approach 1

[0012] Specific Embodiment 1: In this embodiment, the surface energy of carbon fiber is measured according to the following steps: 1. Dry the carbon fiber; The carbon fiber monofilaments are parallel to each other, the distance between adjacent carbon fiber monofilaments is greater than 5mm and less than 10mm, and the length of the carbon fiber exposed to the fixture is X, 8mm≤X≤10mm; 3. Use a surface tension meter to obtain carbon fiber and water and The contact angle of diiodomethane, the surface energy of the test liquid, the polar component of the test liquid surface energy and the dispersion component of the test liquid surface energy, wherein the detection limit of the surface tensiometer is 0.08mg, and the carbon fiber monofilament is inserted into water and diiodine The depth in methane is 5mm, the surface infiltration speed is 0.1mm / s, and the forward and backward infiltration speeds are both 0.008mm / s; 4. Substitute the data measured in step 3 into formula (1) and for...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the dispersion component of the surface energy of water is 22.1mJ / m 2 , the polar component of the surface energy of water is 50.7mJ / m 2 , the surface energy of water is 72.80mJ / m 2 ; The dispersion component of the surface energy of diiodomethane is 50.8mJ / m 2 , the polar component of the surface energy of diiodomethane is 0mJ / m 2 , the surface energy of diiodomethane is 50.8mJ / m 2 . Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the length of the clamp in step 2 is 4 times the length of the fiber clamp. Other steps and parameters are the same as those in Embodiment 1 or 2.

[0015] In step 2 of this embodiment, except for the length, other structures and structures of the clamp are the same as those of the existing fiber clamp (monofilament fiber clamp).

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Abstract

The invention provides a measuring method for carbon fiber surface energy, which relates to a measuring method for surface energy, which solves the defects that in the existing method for using a seepage instrument to measure the carbon fiber surface energy, as synnema measurement is largely influenced by capillary action, the accuracy of measuring results is low and the carbon fiber surface energy can not be reflected actually. The measuring method comprises the following steps of: (1) drying carbon fiber; (2) preparing sampling by carbon fiber; (3) carrying out detection by using a surface tensiometer; and (4) calculating to obtain the carbon fiber surface energy. As the measuring method of the carbon fiber surface energy reduces the external interference to the measured results to the utmost, the contacting angle measurement of the carbon fiber is more accurate; and the measuring method has high accuracy compared with the existing testing method and can accurate to two digits after the decimal point, thus obtaining the more accurate carbon fiber surface energy.

Description

technical field [0001] The invention relates to a method for measuring surface energy. Background technique [0002] Carbon fiber is the main component of high-performance resin-based composites, and its surface energy determines the performance index of the interface of high-performance resin-based composites, directly affecting the performance of high-performance resin-based composites. [0003] Since the surface of carbon fiber cannot flow, the surface energy of carbon fiber can only be obtained by testing the contact angle between carbon fiber and liquid. At present, the contact angle between carbon fiber and different liquids is mainly measured on an infiltration instrument. Because the traditional beam measurement is greatly affected by capillary action, the accuracy of the test result is low, and it cannot truly reflect the surface energy of carbon fiber. Contents of the invention [0004] The present invention aims to solve the defects of the current method of mea...

Claims

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Application Information

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IPC IPC(8): G01N13/02
Inventor 黄玉东郭慧刘丽姜再兴徐丽薇
Owner HARBIN INST OF TECH
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