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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of pH- and temperature-responsive semi-interpenetrating polymer network hydrogels based on linear sodium alginate and crosslinked poly(N-isopropylacrylamide)
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Preparation and characterization of pH- and temperature-responsive semi-interpenetrating polymer network hydrogels based on linear sodium alginate and crosslinked poly(N-isopropylacrylamide)

机译：基于线性藻酸钠和交联聚（N-异丙基丙烯酰胺）的pH响应和温度响应的半互穿聚合物网络水凝胶的制备与表征

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In this study, pH- and temperature-responsive hydrogels based on linear sodium alginate (SA) and crosslinked poly(N-isopropylacrylamide) (PNIPAAm) were prepared by semi-interpenetrating network (semi-IPN) technique. The dually responsive hydrogels were characterized by FTIR, DSC, and SEM, and their temperature- and pH-responsive behaviors were investigated by measuring equilibrium swelling ratios and pulsatile swelling experiments. The results showed that these hydrogels underwent volume phase transition at around 33 degrees C irrespective of the pH value of the medium, but their pH sensitivity was evident only below their volume phase transition temperature. Under basic conditions, the swelling ratios of SA/PNIPAAm semi-IPN hydrogels were greater than that of pure PNIPAAm hydrogel and increased with increasing SA content incorporated into the hydrogels, but the case was inverse under acidic conditions. The pulsatile swelling experiments indicated that the higher the SA content in SA/PNIPAAm semi-IPN hydrogels, the faster the response rate to both pH and temperature change. (C) 2005 Wiley Periodicals, Inc.
机译：在本研究中，通过半互穿网络（semi-IPN）技术制备了基于线性藻酸钠（SA）和交联聚（N-异丙基丙烯酰胺）（PNIPAAm）的pH和温度响应水凝胶。通过FTIR，DSC和SEM对双反应水凝胶进行了表征，并通过测量平衡溶胀比和脉动溶胀实验研究了它们的温度和pH响应行为。结果表明，这些水凝胶无论介质的pH值如何，都在33℃左右发生体积相变，但是它们的pH敏感性仅在其体积相变温度以下才明显。在碱性条件下，SA / PNIPAAm半IPN水凝胶的溶胀率大于纯PNIPAAm水凝胶，并且随着掺入水凝胶的SA含量的增加而增大，但在酸性条件下则相反。脉冲溶胀实验表明，SA / PNIPAAm半IPN水凝胶中SA含量越高，对pH和温度变化的响应速度越快。 （C）2005 Wiley期刊公司

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