Method for determining concentration of azodiisobutyronitrile in dimethyl sulfoxide

Abstract

The invention discloses a method for determining the concentration of azodiisobutyronitrile in dimethyl sulfoxide. The method comprises the following steps that a standard working curve is established, wherein azodiisobutyronitrile solutions with different concentrations are prepared, the absorbance of each prepared solution is measured at the positions with the wavelength of 350 nm and the wavelength of 210 nm, the measured absorbance serves as a vertical coordinate, the standard working curve is established, and a regression formula is calculated; the concentration of the azodiisobutyronitrile in the dimethyl sulfoxide is determined, wherein the absorbance of the to-be-determined solution is measured at the positions with the wavelength of 350 nm and / or the wavelength of 210 nm; the concentration of azodiisobutyronitrile in dimethyl sulfoxide is calculated according to the regression formula. The proper method is provided for determining the concentration of azodiisobutyronitrile indimethyl sulfoxide, and the technical blank is filled. In addition, azodiisobutyronitrile mixed in dimethyl sulfoxide can be recycled in the carbon fiber production process, so that the problem that the quality of carbon fibers is not high due to difficult concentration measurement is avoided.

Description

technical field [0001] The application belongs to the technical field of carbon fiber production, and in particular relates to a method for determining the concentration of azobisisobutyronitrile in dimethyl sulfoxide. Background technique [0002] Azobisisobutyronitrile (AIBN) is white crystal or crystalline powder, insoluble in water, soluble in ether, methanol, ethanol, propanol, chloroform, dichloroethane, ethyl acetate, benzene, etc., mostly oil-soluble agent. [0003] Azobisisobutyronitrile is an oil-soluble azo initiator. The reaction of azo initiators is stable, it is a first-order reaction, there is no side reaction, and it is relatively easy to control, so it is widely used in the research and production of polymers. In addition, it can also be used in other organic synthesis. [0004] At present, the concentration test of azobisisobutyronitrile is mainly used in China to use the decomposition of azobisisobutyronitrile to determine the content of azobisisobutyron...

AI Technical Summary

Problems solved by technology

[0004] At present, the concentration test of azobisisobutyronitrile is mainly used in China to use the decomposition of azobisisobutyronitrile to determine the content of azobisisobutyronitrile according to the nitrogen content released by it; while in the production of carbon fiber, This method is not only expensive for the instrument, but the test is cumbersome, and the test is the concentration of azobisisobutyronitrile in dimethyl sulfoxide (DMSO). Since azobisisobutyronitrile is in dimethyl sulfoxide, it cannot be used Kjeldahl nitrogen analyzer, so in China and the industry, there is no detection method for the determination of the concentration of azobisisobutyronitrile in dimethyl sulfoxide, and there is a technical gap

Therefore, in the carbon fiber production process, if the azobisisobutyronitrile mixed in dimethyl sulfoxide is recycled and used, it is easy to cause unsatisfactory carbon fiber quality due to the difficulty in determining the accurate concentration of azobisisobutyronitrile

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