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以超支化聚乙烯亚胺为构筑基元、以卤键为推动力制备了可以选择性吸附带有负电荷小分子的层层组装多层膜.为了将超支化聚乙烯亚胺引入多层膜体系中,我们首先制备了接枝有卤键给体分子-碘全氟苯的超支化聚乙烯亚胺(BPEI-I).然后将BPEI-I和含有卤键受体的聚(4-乙烯吡啶)(PVPy)在四氢呋喃和三氯甲烷的混合溶剂中组装成膜,并用紫外可见光谱、AFM和XPS对膜的组装过程、形貌、厚度和推动力进行了表征.制备得到的BPEI-I和PVPy多层膜可以吸附含有负电荷的2-蒽甲酸钠小分子,而对有类似结构但带有正电荷的溴化-N-(2-蒽甲基)吡啶盐却没有吸附作用.这种选择性吸附能力主要得益于包覆在多层膜中的超支化聚乙烯亚胺基元的正电荷空腔和由卤键构筑的弱极性微环境.本文的研究为制备选择性吸附薄膜提供了一种新的思路,在传感、富集分离和微接触印刷等领域都有潜在应用价值.
Using hyperbranched polyethylenimine as building block and halogen bond as driving force, multilayer assembled multilayers with small negative charge can be selectively adsorbed.In order to introduce hyperbranched polyethylenimine into multilayers In this system, we first prepared a hyperbranched polyethyleneimine (BPEI-I) grafted with a halogen bond donor molecule, iodobenzene perfluorobenzene, and then BPEI-I and a halogenated bond acceptor poly (PVPy) was assembled into film in a mixed solvent of tetrahydrofuran and chloroform, and the assembly process, morphology, thickness and driving force of the film were characterized by UV-Vis, AFM and XPS.The prepared BPEI-I And PVPy multilayers can adsorb small molecules of negatively charged sodium 2-anthracenecarboxylate but have no adsorption effect on similarly charged but positively charged bromo-N- (2-anthrylmethyl) pyridine salts. The selective adsorption capacity is mainly due to the positively charged cavities of the hyperbranched polyethyleneimines and the weakly polar microenvironment formed by the halogen bonds.These studies in this paper are mainly focused on the preparation of selective adsorption films Provides a new way of thinking in the sensing, enrichment separation and micro-contact printing and other fields have In value.