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Role of ammonium chloride in preparing poly(urea-formaldehyde) microcapsules using one-step method

Authors

  • Chuanjie Fan,

    1. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
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  • Juntao Tang,

    1. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
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  • Xiaodong Zhou

    Corresponding author
    1. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
    • State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, People's Republic of China
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Abstract

This study investigates the role of ammonium chloride in the process of preparing poly (urea-formaldehyde) (PUF) microcapsules using the one-step method. Scanning electron microscopy (SEM) and optical microscopy (OM) were used to observe the morphology of the microcapsule. The results showed that the addition of ammonium chloride in the one-step process of preparing PUF resin microcapsule decreases the pH of the system. The decrease in pH of the system is due to the reaction between ammonium chloride and formaldehyde, and more so due to the reaction between ammonium chloride and hydroxymethyl urea. In addition to reducing the pH of the system, the reaction between ammonium chloride and urea-formaldehyde resin can generate surface active substances, which drives the formed UF nanoparticles to enrich the surface of the dispersed phase. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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