分子印迹聚合反应中致孔剂选择的紫外光谱分析

UV Spectral Analysis of Porogen Selected in Molecular Imprinted Polymerization

在制备分子印迹聚合物的过程中,模板分子与功能单体的结合程度直接影响到分子印迹聚合物的吸附性能,适宜的致孔剂对模板分子与功能单体之间的作用力影响巨大。采用紫外光谱分析法,研究了模板分子香兰素与功能单体丙烯酰胺(AM)在3种致孔剂乙腈、四氢呋喃和乙酸乙酯中相互作用力的大小。实验结果发现,香兰素与AM在乙腈致孔剂中,227nm处的紫外吸收峰发生蓝,蓝移5nm,且吸收峰增强,表明两者之间发生较强的氢键作用力;而它们在另两种致孔剂中作用力很微弱。因此,加入功能单体后光谱改变越大分子间作用力越强,由此制备的分子印迹聚合物的吸附性能越好。

In the process of molecular imprinted polymerization,the intermolecular forces of template molecule and functional monomers directly affect the adsorption properties of molecular imprinted polymers.Suitable porogen enormously impacts the forces between the template molecule and the functional monomers.UV spectral analysis was selected to study on the intermolecular forces between vanillin and acrylamide（AM） in three kind of porogen acetonitrile,tetrahydrofuran and ethyl acetate.Experimental results showed that UV absorption peak at 227nm exhibited a blue shift of 5nm,and the absorption peak increased for vanilin and AM in acetonitrile solvent,indicating a strong hydrogen bonding haven generated.Intermolecular interaction was very weak in other two porogens.It is obvious that the stronger the intermolecular interaction is,the greater the spectrum changes,and the better the adsorption properties of MIPs are.