Carbon fibre surface energy measurement method

[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; 2. Cut the carbon fiber to a length of 45-55 mm, and then randomly select 4 carbon fiber monofilaments and fix them on the fixture, 4 of which are The carbon fiber monofilaments are parallel to each other, and the distance between adjacent carbon fiber monofilaments is greater than 5mm and less than 10mm. The length of the carbon fiber exposed fixture is X, 8mm≤X≤10mm; 3. Use a surface tension meter to detect the carbon fiber and water and The contact angle of methyl iodide, 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. The detection limit of the surface tension meter is 0.08mg, and the carbon fiber monofilament is inserted into the water and the diiodine is inserted. The depth in methane is 5mm, the surface wetting speed is 0.1mm/s, and the forward and backward wetting speeds are both 0.008mm/s; 4. Substitute the data measured in step 3 into formula (1) and formula (2) to calculate Obtain the surface energy of carbon fiber; where the formula (1) in step 4 is γ ( 1 + cos θ ) = 2 γ s p γ p + 2 γ s d γ d , Formula (2) is γ s =γ s d +γ s p , Where θ is the contact angle, γ is the surface energy of the test liquid, γ p To test the polar component of liquid surface energy, γ d To test the dispersion component of the liquid surface energy, γ s Is the surface energy of the fiber, Is the polar component of the fiber surface energy, Is the dispersion component of the fiber surface energy.

[0013] The second embodiment: The difference between this embodiment and the first embodiment is that 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. The other steps and parameters are the same as the first embodiment.

[0014] Specific embodiment three: The difference between this embodiment and specific embodiment one or two is that the length of the clamp in step two is 4 times the length of the fiber clamp. The other steps and parameters are the same as the first or second embodiment.

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