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The amount of initiator and the content of polymerization inhibitor in the monomer affect the polymerization reaction and product quality. Therefore, it should be analyzed before use. Due to the wide variety of initiators and polymerization inhibitors, they cannot be introduced one by one. Here only the analysis of peroxide content and the analysis of hydroquinone and hydroquinone in monomers are introduced.
1. Analysis of peroxide content
(1) Room temperature sodium iodide method Room temperature sodium iodide ebs wax quote method is suitable for easily reduced organic peroxides, such as dibenzoyl peroxide, 2,4-dichlorobenzoyl peroxide, tert-butyl hydroperoxide, etc. .
(2) 60 ℃ sodium iodide method This method is suitable for peroxides that are difficult to reduce, such as tert-butyl peroxyacetate, tert-butyl peroxyisobutyrate, tert-butyl peroxybenzoate and 2 , 2-Di(tert-butylperoxy)butane.
2. Analysis of hydroquinone and hydroquinone content in monomer
Hydroquinone is easily oxidized to p-quinone in alkaline medium.
Hydroquinone reacts with 2.4 dinitrophenylhydrazine to generate dinitrophenylhydrazone. Dinitrophenylhydrazone is star blue in a weakly alkaline medium, and the maximum absorption occurs in the visible light band (620nm). The absorbance is measured with a spectrophotometer, and the pg-level content in the monomer is obtained from the standard curve.
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