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聚环氧乙烯醚-聚环氧丙烯醚-聚环氧乙烯醚(EO20PO70EO20)三嵌段高分子为模板剂制备了SBA-15分子筛.用3-氨丙基-三乙氧基硅烷对SBA-15进行改性,改性后SBA-15表面上的氨基再与(+)O-,O′-二苯甲酰基-L-酒石酸酐(DBTA)进行酰化反应,以酰胺键将该手性羧酸连接在SBA-15表面上.XRD和氮气吸附结果表明,材料经过处理后仍然保持良好的孔性质;13C和29S i魔角旋转核磁共振(MAS NMR)谱图表明,SBA-15与氨丙基化合物的作用是共价成键,表面修饰度达25%;从傅里叶变换红外(FTIR)光谱可见,有部分修饰氨基与DBTA成功地进行了酰化反应,以一个羧基裸露的形式将该二元羧酸化合物连接在表面上;从孔径分布图可知,胺丙基修饰之后孔减小了1.5 nm,与DBTA修饰后孔尺寸又减少0.5 nm,说明胺丙基化合物是头对头垂直连接在S i表面上,而酒石酸分子是采取平行方式侧卧在氨基表面.
SBA-15 molecular sieve was prepared by using polyoxyethylene ether-polyepoxylene ether-polyoxyethylene ether (EO20PO70EO20) triblock polymer as templating agent.The effect of SBA- 15, the amino group on the surface of the modified SBA-15 is acylated with (+) O-, O’-dibenzoyl-L-tartaric anhydride (DBTA) The carboxylic acid was attached to the surface of SBA-15.The results of XRD and nitrogen adsorption showed that the material still maintained good pore properties after treatment. The 13C and 29S i MAS NMR spectra showed that SBA-15 and ammonia The effect of the propyl compound is covalent bonding, the degree of surface modification is up to 25%. From the FTIR spectra, some of the modified amino groups are successfully acylated with DBTA, The dicarboxylic acid compound was attached to the surface. From the pore size distribution, the pore diameter was reduced by 1.5 nm after the aminopropyl modification, and the pore size was reduced by 0.5 nm after DBTA modification. This shows that the aminopropyl compound is a Connected to the Si surface, while the tartaric acid molecules are taken parallel to the side lying on the amino surface.