Condensation of (aminomethyl)triethoxysilane with thiocarbamide in the presence of catalytic amounts of ammonium sulfate was used to synthesize N,N-bis(triethoxysilylmethyl)thiocarbamide. The latter was brought into oxidative hydrolytic polycondensation with H2O2 to obtain poly[N,N′-bis(silsesquioxanylmethyl)thiocarbamide S, S-dioxide] whose properties were compared with the properties of poly[N,N′-bis(silsesquioxanylpropyl)thiocarbamide S,S-dioxide]. Both polymers in highly acidic media rather strongly absorb Ag(I), while at pH 7 they reduce most absorbed Ag+ to the metal. Their reaction with potassium permanganate involves reduction of Mn7+ to Mn4+. The first polymer is a less effective sorbent and redox agent than the second.
在大量
硫酸铵催化下,用(
氨甲基)三乙氧基
硅烷与
硫代甲酰胺缩合合成 N,N-双(三乙氧基
硅甲基)
硫代甲酰胺。将后者与
H2O2 进行氧化
水解缩聚,得到聚[N,N′-双(
硅烷氧基甲基)
硫代碳酰胺 S,S-二氧化物],并将其性质与聚[N,N′-双(
硅烷氧基丙基)
硫代碳酰胺 S,S-二氧化物]的性质进行比较。在高酸性介质中,这两种聚合物都能强烈吸收 Ag(I),而在 pH 值为 7 时,它们能将吸收的大部分 Ag+ 还原成
金属。它们与
高锰酸钾的反应是将 Mn7+ 还原成 Mn4+。与第二种聚合物相比,第一种聚合物的吸附剂和氧化还原剂效果较差。