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首页> 外文期刊>RSC Advances >New ampholytic microgels based on N-isopropylacrylamide and alpha-amino acid: changes in swelling behavior as a function of temperature, pH and divalent cation concentration
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New ampholytic microgels based on N-isopropylacrylamide and alpha-amino acid: changes in swelling behavior as a function of temperature, pH and divalent cation concentration

机译：基于N-异丙基丙烯酰胺和α-氨基酸的新型两性微凝胶：溶胀行为随温度，pH和二价阳离子浓度的变化

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摘要

Several new microgels based on N-isopropylacrylamide and the amino acid L-ornithine were synthesized by means of surfactant free emulsion polymerization. N-delta-Acryloyl ornithine was copolymerized with N-isopropylacrylamide and N,N'-methylenebisacrylamide, leading to the synthesis of a new ampholytic microgel. The swelling behavior of the obtained microgels with respect to the amount of amino acid incorporated in the polymer network, temperature, concentration of ions and pH was investigated. The pH dependence of the microgel size, measured at a constant temperature, was found to exhibit a minimum; the pH range where the minimum appeared corresponded well with the pH range where zwitterions dominated. The temperature dependence of the swelling process obtained for different pH values showed that for the pH region where zwitterions dominated, the polymer networks collapsed more efficiently. The presence of free alpha-amino acid groups attached to the polymeric network of the microgels also enabled the complexation of some metal cations. The influence of the presence of two metal ions (Cu2+ and Ca2+), which differ significantly in their ability to form complexes with the alpha-amino-acid, on the swelling behavior was investigated. It was found that the presence of copper ions that form stable complexes with the alpha-amino acid strongly influenced the swelling behavior of the investigated microgels.
机译：通过无表面活性剂乳液聚合合成了几种基于N-异丙基丙烯酰胺和氨基酸L-鸟氨酸的新型微凝胶。将N-δ-丙烯酰基鸟氨酸与N-异丙基丙烯酰胺和N，N'-亚甲基双丙烯酰胺共聚，从而合成了新的两性微凝胶。研究了所得微凝胶相对于聚合物网络中掺入的氨基酸量，温度，离子浓度和pH的溶胀行为。发现在恒定温度下测得的微凝胶尺寸的pH依赖性最小。出现最小值的pH范围与两性离子占主导的pH范围很好。在不同pH值下获得的溶胀过程的温度依赖性表明，对于两性离子占主导的pH区域，聚合物网络更有效地塌陷。附着在微凝胶聚合物网络上的游离α-氨基酸基团的存在还使某些金属阳离子能够络合。研究了两种金属离子（Cu2 +和Ca2 +）的存在对溶胀行为的影响，这两种金属离子与α-氨基酸形成络合物的能力明显不同。发现与α-氨基酸形成稳定络合物的铜离子的存在强烈影响所研究的微凝胶的溶胀行为。

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