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Alkyl ketene dimer akd Illustration and Icon
Alkyl ketene dimer akd
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Stylized chemical structure of an alkyl ketene dimer (AKD), showing a beta-lactone ring with a carbonyl oxygen (red) and two long saturated alkyl chains forming a V shape. In the biological hierarchy, this small organic molecule functions within papermaking formulations that treat the cellulose fiber network of paper. In chemistry and materials science, AKD acts as a hydrophobizing sizing agent, reacting with hydroxyl groups of cellulose to form beta-keto ester linkages, thereby reducing paper wettability under neutral to alkaline conditions.
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