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Tetra-sensitive graft copolymer gels with high volume changes

机译：具有高体积变化的Tetra敏感接枝共聚物凝胶

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For the preparation of multi-responsive graft copolymer gels for hydrogel-based microsystem technologies, a poly(4-vinylbenzoic acid) macromonomer was prepared in a three-step synthesis. At first, a chain transfer agent was functionalized with an azide group, followed by a reversible addition fragmentation chain transfer polymerization to give an azide bearing poly(4-vinylbenzoic acid) macromonomer. Subsequently, an acrylamide functionalized macromonomer was prepared by Cu-catalyzed alkyne and azide 1,3-dipolar cycloaddition. With this acrylamide functionalized poly(4-vinylbenzoic acid) macromonomer, various graft copolymer gels composed of a temperature-sensitive poly( N -isopropylacrylamide) backbone and pH-sensitive poly(4-vinylbenzoic acid) graft chains were prepared by radical polymerization. Moreover, the swelling behavior of the hydrogels was investigated with respect to pH, temperature, solvent and salt. It was shown that the graft copolymer gels respond to these stimuli independently with a sharp transition and a high volume change. Additionally, the swelling behavior was reversible over various cycles. This behavior is fundamental for applications of smart gels in microfluidic platforms.
机译：为了制备用于水凝胶的微系统技术的多响应接枝共聚物凝胶，在三步合成中制备聚（4-乙烯基苯甲酸）大分子单体。首先，将链转移剂用叠氮基团官能化，其次是可逆的添加碎片链转移聚合，得到叠氮化物轴承聚（4-乙烯基苯甲酸）大分子单体。随后，通过Cu催化的炔烃和叠氮化物1,3-偶极环加入制备丙烯酰胺官能化大分子单体。用该丙烯酰胺官能化聚（4-乙烯基苯甲酸）大分子单体，通过自由基聚合制备由温敏 - 聚（N-异丙基丙烯酰胺）主链和pH敏感聚（4-乙烯基苯甲酸）接枝链组成的各种接枝共聚物凝胶。此外，对pH，温度，溶剂和盐研究了水凝胶的溶胀行为。结果表明，接枝共聚物凝胶独立地响应这些刺激，并具有急剧的过渡和高体积变化。另外，膨胀行为在各种循环中是可逆的。这种行为是微流体平台中智能凝胶应用的基础。

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