Herein, four novel poly(ionic liquid)@poly(N-isopropylacrylaminde) microgels were prepared and doped into polyvinylidene fluoride (PVDF) to fabricate eight temperature-responsive mixed matrix membranes (TRMs) for the efficient separation of natural citrus flavonoids, viz. naringin, neohesperidin, naringenin, and hesperetin. Dynamic light scattering of microgels in water at 20 and 50 ℃ confirmed their temperature-responsive properties. Water flux of TRMs at different temperatures proved their switchable response characteristic between 30 and 35 ℃. The mechanical property, pore size distribution, porosity, and specific surface area of these TRMs were measured. Moreover, the chemical structure, microstructure, hydrophobicity, thermostability, anti-fouling performance, and charge property were also confirmed for them. The M4 membrane exhibited a maximum separation selectivity of 81.66% at 20 ℃. Binding energy of G4 microgel to flavanone glycosides through H-bonding was greater than that of G4/flavanones. These TRMs, as a kind of novel separation materials, have the potential in the separation of various natural products.

中文翻译：

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基于聚离子液体@聚N-异丙基丙烯酰胺微凝胶和聚偏二氟乙烯的温度响应型混合基质膜用于柑橘类黄酮的选择性分离


在此，制备了四种新型聚（离子液体）@聚（N-异丙基丙烯酰胺）微凝胶，并将其掺杂到聚偏二氟乙烯（PVDF）中，以制造八种温度响应型混合基质膜（TRM），用于有效分离天然柑橘类黄酮，即。柚皮苷、新橙皮苷、柚皮素和橙皮素。微凝胶在 20 和 50 ℃ 水中的动态光散射证实了它们的温度响应特性。不同温度下TRM的水通量证明了它们在30℃和35℃之间的可切换响应特性。测量了这些 TRM 的机械性能、孔径分布、孔隙率和比表面积。此外，还对其化学结构、微观结构、疏水性、热稳定性、防污性能和带电性能进行了确认。 M4膜在20 ℃时表现出最大分离选择性为81.66%。 G4微凝胶通过氢键与黄烷酮苷的结合能大于G4/黄烷酮。这些TRM作为一种新型分离材料，在多种天然产物的分离中具有潜力。