Polyacrylic (PAN) carbon fiber was obtained by high temperature treatment of organic fiber, and its structure and properties were closely related to heat treatment time. The effects of heat treatment time on the structure and properties of preoxidized fibers were studied by solid nuclear magnetic resonance spectrometer, thermogravimetric analyzer, X-ray diffractometer and mechanical properties analysis.

The results show that the content of —C═N、C═C、C═CH、C═O formed by cyclization, dehydrogenation and oxidation increases with the prolongation of pre-oxidation time. And the stability of preoxidized fiber is enhanced. The carbon fiber formed by this method has the small microcrystal size, large interlayer spacing, large tensile strength and large tensile strength. But its bulk density is low. With the prolongation of carbonation time, the thermal stability of the fiber decreased at first and then increased. The microcrystal size of carbon fiber increases, the interlayer spacing decreases, and the bulk density, tensile strength and tensile modulus of carbon fiber increase.

The experiment of "relatively high" carbonation temperature was carried out by low fiber wet spinning precursor. And the change of N content in carbon fiber C was investigated by means of elemental analysis. The effects of high carbon temperature on mechanical properties and bulk density were studied by measuring mechanical properties and bulk density. The results show that the increase of carbon content, elastic modulus and the decrease of nitrogen are slow before 1600 ℃. Between 1600 ℃ and 1900 ℃, the increase of carbon content and elastic modulus, and the decrease of nitrogen greatly increased. At 1480 ℃, the tensile strength peaked. At 1500 ~1700 ℃, the tensile strength decreases slightly with the increase of temperature. At 1900 ℃, the tensile strength decreased greatly. With the increase of carbonation temperature, the bulk density of carbon fiber decreased gradually. The bulk density of carbon fiber decreased little before 1500 ℃, and then increased rapidly.

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