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以 AIBN为引发剂,丙烯酰胺与苯乙烯在1 4—二氧六环溶剂中进行共聚,得到无规共聚物P(St-Am)。使P(St-Am)与过量甲醛反应,生成羟甲基化产物。该产物在酸性条件下进一步与二氰二胺反应,制得分子链上同时含有离子和疏水基团的高分子苯乙烯—丙烯酰胺基甲撑脒基脲盐酸盐共聚物P(St-Am·MG)。P(St-Am) 和P(St-Am·MG) 的结构用红外光谱法鉴定,组成用元素分析法测定。 P(St-Am·MG) 在 MeOH/H_2O混合溶剂中的粘性行为表明它是带有疏水基的聚电解质,用电导滴定法和小角激光光散射法分别测定其电荷密度和分子量。
Using AIBN as initiator, acrylamide and styrene were copolymerized in 1 4-dioxane solvent to obtain random copolymer P (St-Am). P (St-Am) is reacted with an excess of formaldehyde to form a methylolated product. The product was further reacted with dicyandiamide under acidic conditions to prepare a polymer styrene-acrylamide carbamidine urea hydrochloride P (St-Am) having both ionic and hydrophobic groups on the molecular chain · MG). The structures of P (St-Am) and P (St-Am · MG) were identified by infrared spectroscopy and the composition was determined by elemental analysis. The viscous behavior of P (St-Am · MG) in a mixed solvent of MeOH / H 2 O shows that it is a polyelectrolyte with hydrophobic groups. The charge density and molecular weight of P (St-Am · MG) were determined by conductometric titration and small angle laser light scattering.