Adhesive ph

In both oxidizing conditions, the three properties of the adhesive are at pH 7 . 0-7 . 5 is optimal, because during the oxidation process, the key to the reaction is to destroy the hydrogen bonding between the hydroxyl groups of the starch. Under acidic conditions, the hydrogen bonds are strengthened, which increases the reaction resistance and reduces the oxidation efficiency. Under the conditions, the hydrogen bonds are destroyed and the degree of oxidation increases. However, a too high pH may cause the decomposition of hydrogen peroxide itself and reduce the oxidation efficiency. In addition, the catalyst used in this experiment is copper sulfate. When it is neutral, the hydrogen bonds between the starch molecules are weak, and the cu2+ causes the starch granule structure to be destroyed, the hydroxyl group is activated, and the reaction efficiency is increased, while in the alkaline condition, Although hydrogen bonds are destroyed, cu2+ precipitates and is confined, resulting in a decrease in reaction efficiency. Therefore, it is better to control the reaction environment in a neutral environment, and the reaction liquid is also easy to handle, which is in line with the requirements of environmental protection.

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