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Mechanism

- Oct 17, 2016 -

As the monomer in polymerization of acrylamide occurs have a branched chain transfer, PAM polymer chain structure containing branched-chain cross-linking and imine-bridge structure. Crosslinking moderately high relative molecular mass and soluble and cross-linked insoluble products. Weakening chain Association, PAM glass transition temperature lower than dissolve easily. In low molecular amide (such as urea) can weaken after PAM chain of Association, so as to improve the dissolution of PAM. In addition, urea or inhibit the delivery of the products and enhance the role of PAM molecular weight. Preparation of high molecular weight PAM for the pursuit of the goal, but relative molecular mass greater branched the more added to PAM dissolve difficulties. Hydrolysis degree of PAM: PAM dissolution can be hydrolyzed under, degree of hydrolysis of bigger is dissolved. PAM break down easily under the greater than 200 ° c, 210 ° c under anaerobic conditions, PAM amide dehydration into cyano at 500 ° c under polyacrylamide PAM into carbon black powder. PAM amide group in the molecule has a high level of activity, including the flocculation and thickening, and resistance and other properties. PAM: toxic: PAM is nontoxic, but Pam PAM molecular residual acrylamide, acrylamide is toxic, in a polyacrylamide PAM allows for residual acrylamide 1%. Should be used for water purification, sugar cane juice and other foods and food contact paper, and residues of acrylamide in polyacrylamide PAM should be less than 0.05%

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