Method for detecting generalized orientation degree of polyacrylonitrile fibers by applying two-dimensional X-ray diffraction
A technology of polyacrylonitrile fiber and degree of orientation, which is applied in the direction of material analysis using radiation diffraction, and can solve problems such as inaccuracy and incompleteness
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[0015] The technical solution of the present invention will be further explained and described in the manner of specific embodiments below.
[0016] 1) The polyacrylonitrile fiber is tested by a two-dimensional X-ray diffractometer to obtain a two-dimensional diffraction pattern, and at the same time, the I(2θ,κ) curve can be obtained, that is, the diffraction intensity-diffraction angle-azimuth curve;
[0017] 2) For the crystal phase, select the (100) crystal plane diffraction angle 2θ c = 16.9°, at diffraction angle 2θ c Calculate the curve integral within the range of ±Δ2θ; for the oriented amorphous phase, select the diffraction angle 2θ o =25.2°, at diffraction angle 2θ o Calculate the curve integral within the range of ±Δ2θ; obtain the I~κ curve respectively, that is, the diffraction intensity-azimuth angle curve; Δ2θ is 1°~5°;
[0018] 3) Calculate the half-height width of the two I~κ curves respectively, and the half-height width of the crystalline phase curve is H...
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