Unprecedented acid-promoted polymerization and gelation of acrylamide: A serendipitous discovery

Siew Yin Chan, Shermin S. Goh, Qingqing Dou, Benjamin Qi Yu Chan, Wee Sim Choo, David James Young, Xian Jun Loh

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    4 Citations (Scopus)

    Abstract

    Dilute acid polymerizes degassed, aqueous acrylamide with concomitant gelation, without the need for added free radical initiator or cross-linking agent. This reaction is accelerated by sonication or UV irradiation, but inhibited by adventitious oxygen or the addition of a free radical inhibitor, suggesting an acid-accelerated free radical process. The resulting hydrogels are thixotropic in nature and partially disrupted by the addition of chaotropic agents, indicating the importance of hydrogen bonding to the 3D network. This discovery was made while trying to prepare pectin-polyacrylamide hydrogels. We observed that pectin initiated the gelation of acrylamide, but only if the aqueous pectin samples had a pH lower than ca. 5.

    Original languageEnglish
    Pages (from-to)1797-1804
    Number of pages8
    JournalChemistry-An Asian Journal
    Volume13
    Issue number14
    DOIs
    Publication statusPublished - 16 Jul 2018

    Keywords

    • acrylamide
    • cross-linking
    • gelation
    • hydrogels
    • polymerization

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