水溶性非离子大分子与烷基硫酸钠同系物团簇化的比饱和簇集量

Specific Saturation Capacity of Clusterization in Cluster of ROSO_3Na with Water-soluble Nonionic Macromolecules

研究了烷基硫酸钠同系物 ( ROSO3Na)与聚乙二醇 ( PEG)及聚乙烯吡咯烷酮 ( PVP)的γ-lgc曲线的双拐点特征 ,根据拟双平台现象求得烷基硫酸钠同系物对大分子的饱和簇集量Γ∞ ( mmol/L )和比饱和簇集量[Γ∞ ].由Γ∞ -c P 回归方程的斜率得到 ROSO3Na-PEG及 ROSO3Na-PVP体系的 [Γ∞ ]reg分别为 0 .3 94和0 .41 5 m/n. [Γ∞ ]随表面活性剂疏水基链长、大分子分子量及浓度的变化均很小 ,t检验结果表明回归值[Γ∞ ]reg与实验值 [Γ∞ ]exp之间无明显差异 ,因此超分子相互作用参数 [Γ∞ ]可以被视为不变量 .

The characteristics of bis-transition points in γ-lgc curves of surface active sodium alkylsulfates with water-soluble nonionic macromolecules such as PVP or PEG were studied, and saturation capacity of clusterization Γ ∞ and specific saturation capacity of clusterization [Γ ∞] of surfactant on macromolecule were calculated in accordance with the phenomena of pseudo double-plateau. [Γ ∞] of ROSO 3Na changes little with the chain length of both surfactant and macromolecule, as well as concentration of macromolecule. [Γ ∞] reg are 8.96 and 3.74 mmol/L, or 0.394 m/n and 0.415 m/n for ROSO 3Na-PEG and ROSO 3Na-PVP respectively, which was obtained from regression of Γ ∞-c P. The results of t-test show that there is no significant difference between [Γ ∞] reg and [Γ ∞] exp, therefore, it is reasonable to express [Γ ∞], a supramolecular interaction parameter, as a constant for soft cluster of ROSO 3Na homologue with PEG or PVP respectively. It is deduced from the experimental results that the soft clusters are formed between normal pseudo-micelles of ROSO 3Na and macromolecules by supramolecular self-assembly force in which electrostatic interaction is dominant.