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Random copolymer gels of N-isopropylacrylamide and N-ethylacrylamide: effect of synthesis solvent compositions on their properties

机译: N -异丙基丙烯酰胺和 N -乙基丙烯酰胺的无规共聚物凝胶:合成溶剂组合物对其性能的影响

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Random copolymer gels of N-isopropylacrylamide (NIPAM) and N-ethylacrylamide (NEAM) were synthesized using a 1?:?1 monomer molar ratio in different methanol–water (xm = 0, 0.06, 0.13, 0.21, 0.31 0.43, 0.57, 0.76, where xm = mole fraction of methanol) mixtures. The samples were characterized using different techniques like Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), swelling ratio measurements, deswelling kinetics study, atomic force microscopy (AFM), and rheology. We found that, with the variation of the solvent composition (methanol–water mixtures) the properties of the gels varied significantly. These results can be explained on the basis of the interactions of the two different kinds of monomers with different methanol–water mixtures, their different kinds of thermoresponsiveness and hydrophilicity, and their different cononsolvent properties toward methanol–water mixtures.
机译: N -异丙基丙烯酰胺(NIPAM)和 N -乙基丙烯酰胺(NEAM)的无规共聚物凝胶是在不同的甲醇-水( em> x m = 0、0.06、0.13、0.21、0.31 0.43、0.57、0.76,其中 x m =甲醇的摩尔分数)混合物。使用不同的技术对样品进行表征,例如傅立叶变换红外光谱(FTIR),扫描电子显微镜(SEM),溶胀比测量,溶胀动力学研究,原子力显微镜(AFM)和流变学。我们发现,随着溶剂成分(甲醇-水混合物)的变化,凝胶的性能也发生了显着变化。可以基于两种不同类型的单体与不同的甲醇-水混合物的相互作用,其不同种类的热响应性和亲水性以及它们对甲醇-水混合物的不同溶剂型性质来解释这些结果。

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