聚氧乙烯山梨糖醇酐单油酸酯的亲水-亲油平衡值方法研究

目的:通过分析测定不同厂家聚氧乙烯山梨糖醇酐单油酸酯(吐温80)的亲水-亲油平衡(HLB)值,初步评价吐温80的质量。方法:采用水数法,通过多项式方程的拟合对3种溶剂系统进行选择,确定最佳的溶剂系统测定HLB值。结果:不同厂家吐温80的HLB值与文献值有差异。结论:水数法测定吐温80的HLB值简便、易行,可用HLB值对吐温80进行初步筛选。

树枝状高分子聚酰胺-胺水溶液的性质

Three polyamidoamine(PAMAM) dendrimers have been synthesized by divergence method with ethylenediamine as core. The surface tensions of aqueous solution of different generation PAMAM were determined by traditional surfactant method. The results showed that the whole PAMAM doesn′t have surface acti- vity and the half PAMAM have certain surface activity. Their critical micelle concentrations(CMC) were obtained from surface tension curves, and the hydrophile-lipophile balance number(HLB), saturated adsorption capacity, molecular cross section area and molecular diameter were calculated. The results revealed that the molecular diameter of 0.5G, 1.5G and 2.5G PAMAM were 0.743, 0.998 and 1.371 nanometer, respe- ctively. The dendrimer obtained was also proved to be of nanometer order.

脂肪醇聚氧乙烯醚的HLB值分析方法研究

采用水数法,选择异丙醇/甲苯和1,4-二氧六环/苯两种溶剂体系测定了不同碳链长度和不同EO链长度的脂肪醇聚氧乙烯醚的HLB值。通过多项式方程拟合以及与文献计算值比较,确定1,4-二氧六环/苯是测定脂肪醇聚氧乙烯醚HLB值的比较好的溶剂系统。