EFFECT OF POTASSIUM FLUORIDE ON THE MICELLAR BEHAVIOR OF PLURONIC F-68 IN AQUEOUS-SOLUTION
EFFECT OF POTASSIUM FLUORIDE ON THE MICELLAR BEHAVIOR OF PLURONIC F-68 IN AQUEOUS-SOLUTION
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DOI：
10.1021/la00044a005
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发表时间：
1992-08-01
期刊：
影响因子：
3.9
通讯作者：
BROWN, W
中科院分区：
文献类型：
--
作者：
BAHADUR, P;LI, PY;BROWN, W
Pluronic F68是一种平均组成为EO78PO30EO78的PEO/PPO/PEO型三段共聚物，当溶液中加入1.0 M KF时，其浊点降低了50℃。聚合属性也会受到影响。根据动态光散射和核磁共振自扩散测量确定的扩散系数或静态光散射的分子量估计，溶液中单体和胶束的大小在盐存在和不存在时是相似的，但胶束的生长始于较低的温度-在1.0 M KF中25℃，在水中44℃，从外推值到零浓度-并在盐溶液中继续在更宽的温度范围内生长。特性粘度表明，与Pluronics家族中疏水性更强的成员形成的胶束相比，该胶束不太紧密，更容易溶剂化，但随着温度的升高，其溶剂化程度比类似分子量的PEO组分更低。
The cloud point of Pluronic F68, a triblock copolymer of the type PEO/PPO/PEO with average composition EO78PO30EO78, is reduced by 50-degrees-C when 1.0 M KF is added to the aqueous solution. The aggregation properties are also affected. The size of the unimers and micelles in the solution, as estimated from diffusion coefficients, determined by dynamic light scattering and NMR self-diffusion measurements, or molecular weights from static light scattering, are similar with and without salt present, but the growth of the micelles starts at a lower temperature-25-degrees-C in 1.0 M KF, 44-degrees-C in water, values from extrapolation to zero concentration-and continues over a wider temperature range in the salt solution. The intrinsic viscosity indicates that the micelles are less compact-more solvated-than those formed by the more hydrophobic members of the Pluronics family but become less solvated with increasing temperature than PEO fractions of similar molecular weight.