Unprecedented Acid‐Promoted Polymerization and Gelation of Acrylamide: A Serendipitous Discovery,Chemistry - An Asian Journal

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Unprecedented Acid‐Promoted Polymerization and Gelation of Acrylamide: A Serendipitous Discovery
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2018-06-20 , DOI: 10.1002/asia.201800552
Siew Yin Chan _{1,

2} , Shermin S Goh ₂ , Qingqing Dou ₂ , Benjamin Qi Yu Chan _{2,

3} , Wee Sim Choo ₁ , David James Young _{1,

2,

4} , Xian Jun Loh _{2,

3,

5}

Affiliation

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.

中文翻译：

前所未有的酸促进丙烯酰胺聚合和凝胶化：一个偶然的发现

稀酸聚合脱气的含水丙烯酰胺并伴随凝胶化，无需添加自由基引发剂或交联剂。该反应可通过超声处理或紫外线照射加速，但会被外来氧或添加自由基抑制剂抑制，表明酸加速自由基过程。所得水凝胶本质上具有触变性，并且通过添加离液剂而部分破坏，这表明氢键对 3D 网络的重要性。这一发现是在尝试制备果胶聚丙烯酰胺水凝胶时发现的。我们观察到，果胶引发丙烯酰胺的凝胶化，但前提是果胶水溶液样品的 pH 值低于约 1。 5.

更新日期：2018-06-20

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