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首页> 外文期刊>Journal of Applied Polymer Science >Synthesis and characterization of hydroxyethyl methacrylate/acrylamide responsive hydrogels
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Synthesis and characterization of hydroxyethyl methacrylate/acrylamide responsive hydrogels

机译：甲基丙烯酸羟乙酯/丙烯酰胺响应水凝胶的合成与表征

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摘要

Hydrogels based on an aqueous solution of hydroxyethyl methacrylate (HEMA) and acrylamide (AM) in the presence of trithioglycolic acid (TTGA) were prepared under the effect of gamma irradiation. These hydrogels were characterized by IR spectroscopy and thermogravimetric analysis and investigated for temperature- and pH-responsive materials. It was found that TTGA is essential for the formation of HEMA/AM hydrogels at different compositions, in which the gel fraction depends on composition. A binary mixture of HEMA and AM at equal ratios was the critical composition that forms hydrogels, even in the presence of TTGA. The IR spectroscopic analysis showed that the formation of hydrogels depends on hydrogen bonding and crosslinking. The TGA investigations with respect to mass loss and the temperatures of the maximum value of the rate of reaction showed that HEMA/AM hydrogels possess higher thermal stability than that of pure HEMA and this stability increases with increasing ratio of the AM component. Also, it was observed that the temperature of the maximum value of the rate of thermal decomposition reaction depends on hydrogel composition. However, calculations of the activation energy showed that the hydrogel composed of 90%, HEMA and 10%, AM exhibits the highest thermal stability during the increasing or decreasing rate of reaction. Kinetic studies of swelling in water showed that HEMA/AM hydrogels displayed a temperature-responsive character within the temperature range 25-30degreesC, and showed a stepwise swelling behavior in the pH range 2-10, depending on composition. (C) 2005 Wiley Periodicals, Inc.
机译：在γ-射线辐射的作用下，制备了基于甲基丙烯酸羟乙酯（HEMA）和丙烯酰胺（AM）的水溶液在三硫代乙醇酸（TTGA）存在下的水凝胶。这些水凝胶通过红外光谱和热重分析进行了表征，并针对温度和pH响应材料进行了研究。发现TTGA对于在不同组成下形成HEMA / AM水凝胶是必不可少的，其中凝胶分数取决于组成。甚至在TTGA存在的情况下，HEMA和AM的二元混合物等比例混合也是形成水凝胶的关键组成。红外光谱分析表明，水凝胶的形成取决于氢键和交联。关于质量损失和反应速率的最大值的温度的TGA研究表明，HEMA / AM水凝胶具有比纯HEMA更高的热稳定性，并且该稳定性随AM组分的比例增加而增加。另外，观察到热分解反应速率的最大值的温度取决于水凝胶组成。然而，活化能的计算表明，由90％HEMA和10％AM组成的水凝胶在反应速率的增加或降低过程中表现出最高的热稳定性。在水中溶胀的动力学研究表明，HEMA / AM水凝胶在25-30℃的温度范围内显示出温度响应特性，并且在pH 2-10范围内显示逐步溶胀行为，具体取决于组成。 （C）2005 Wiley期刊公司

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