Four new types of organic siloxane surfactants with quaternary ammonium group have been obtained.
通过多步骤合成了四种含有季铵基的有机硅表面活性剂。
The catalyst also contains urea and quaternary ammonium groups, and long-fluorine hydrophobic group which can reduce the surface tension of water.
该催化剂同时含有双脲基和季铵盐基团以及疏水基的长氟链。
A cationic polymeric flocculant was chosen because its hydrolysate with positive ammonium group enhanced the adsorption of residual COD and improved the flocculation efficiency.
选择阳离子高分子絮凝剂，由于其水解产物带有正电荷铵盐基团，加强了残存COD的吸附，完善了絮凝分离过程。
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