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首页> 外文期刊>RSC Advances >Topology and porosity modulation of polyurea films using interfacial polymerization
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Topology and porosity modulation of polyurea films using interfacial polymerization

机译：使用界面聚合的聚脲膜的拓扑和孔隙率调节

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Polyurea (PU) films are interesting owing to the high mechanical properties and wide range of applications. Here we report an interfacial synthesis of a PU thin film at the liquid–liquid interface using the reaction between diisocyanate and polyamines. Three amines – polyethylenimine (PEI), diethylenetriamine (DETA) and tris(2-aminoethyl)amine (TREN) were dissolved in the aqueous phase separately and allowed to react with an organic solution of hexamethylene diisocyanate (HMDI) at the liquid–liquid interface. The structure and morphologies of the films were established using spectroscopic and microscopic techniques. Smooth PU films were obtained from the reaction of HMDI with PEI, whereas films with holes and tubules were obtained from small molecular amines such as DETA and TREN. Such observations are explained based on the differences in solubility, reactivity of the reagents and molecular size dependant diffusion across the film. The effect of the changes in concentration of reactants and time of reaction on film thickness and transport of organic dye molecules through the film were investigated. PEI gave a smooth defect-free film of PU, whereas small molecular amines upon reaction with HMDI gave films with significant number of defects. To demonstrate the accessibility of functional groups on the film, adsorption of fluorescent dyes on the film surface was investigated. From the UV-Vis spectroscopic measurements, it is clear that acidic molecules adsorb on the surface of the films and the corresponding esters are not extracted efficiently by the film. In summary, the synthesis and characterization of PU films from multiple amines, and the transport of small molecules and adsorption of dyes on the surface of the films were established.
机译：由于高机械性能和广泛的应用，聚脲（PU）薄膜很有趣。在这里，我们在液 - 液界面上报道了PU薄膜的界面合成使用二异氰酸酯和多胺之间的反应。将三个胺 - 聚乙烯亚胺（PEI），二亚乙基三胺（DETA）和三（2-氨基乙基）胺（Tren）分别溶解在水相中，并在液体液体界面下与六亚甲基二异氰酸酯（HMDI）的有机溶液反应。使用光谱和微观技术建立薄膜的结构和形态。从HMDI与PEI的反应获得光滑的PU膜，而用孔和小管的薄膜从诸如DETA和Tren的小分子胺获得。基于溶解度，试剂的反应性和在整个薄膜上的分子大小依赖性扩散的差异来解释这些观察结果。研究了反应物浓度变化的影响和通过薄膜的膜厚度和有机染料分子的运输的影响。 PEI对PU的无光滑缺陷薄膜，而与HMDI反应后的小分子胺使薄膜具有大量缺陷。为了证明膜上的官能团的可访问性，研究了薄膜表面上的荧光染料的吸附。从UV-Vis光谱测量开始，显然薄膜吸附在膜的表面上的酸性分子和相应的酯在膜上没有有效地提取。总之，建立了来自多种胺的PU膜的合成和表征，以及小分子的运输和染料在薄膜表面上的吸附。

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