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通过对聚乙二醇端羟基烯丙基化及硅氢化加成反应,将疏水性有机硅基团接枝到亲水的聚乙二醇链段两端,得到有机硅接枝单元数量不同的两种线形-枝状两亲聚合物,用NMR、FTIR对其结构进行了表征,并评价了其表面活性。两种聚合物具有良好的表面活性,其临界聚集浓度(CAC)值分别为5.13×10-4mol/L和4.83×10-5mol/L,γCAC值分别为32.48 m N/m和32.21 m N/m。此外,该聚合物水溶液的表面张力-浓度曲线呈现“两段式”变化,说明聚合物分子在空气/水表面上有构象变换过程,而聚合物PEG链段、含硅枝状结构将显著影响吸附层中聚合物的分子构象。
Hydrophobic organosilicon groups were grafted onto both ends of the hydrophilic polyethylene glycol segments by terminal hydroxy-allylation of polyethylene glycol and hydrosilylation reaction to obtain different numbers of organosilicon grafting units Two linear - dendritic amphiphilic polymers were characterized by NMR and FTIR. Their surface activities were evaluated. The two polymers have good surface activity with CAC values of 5.13 × 10-4 mol / L and 4.83 × 10-5 mol / L, respectively, with γCAC values of 32.48 mN / m and 32.21 mN / m. In addition, the surface tension-concentration curve of the aqueous polymer solution shows a “two-stage” variation, indicating that the polymer molecules have a conformational transition on the air / water surface while the polymer PEG segments, the silicon-containing dendritic structures Significantly affects the molecular conformation of the polymer in the adsorbed layer.