Self-assembling of poly(ε-caprolactone)-b-poly(ethylene oxide) diblock copolymers in aqueous solution and at the silica-water interface
Self-assembling of poly(ε-caprolactone)-b-poly(ethylene oxide) diblock copolymers in aqueous solution and at the silica-water interface
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DOI：
10.1016/j.physb.2004.03.233
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发表时间：
2004-07-15
影响因子：
2.8
通讯作者：
Jerome, R.
中科院分区：
文献类型：
--
作者：
Leyh, B.;Vangeyte, P.;Jerome, R.
用小角中子散射研究了不同嵌段长度的聚己内酯-b-聚环氧乙烷二嵌段共聚物在水溶液中、在添加十二烷基硫酸钠（SDS）的水溶液中以及在硅-水界面上的自组装行为。由于这些共聚物的临界胶束浓度非常小（0.01 g/l），在我们的实验条件下观察到胶束。聚（ε-己内酯）核被聚（环氧乙烷）冠包围。胶束形状因子已被测量在低共聚物浓度（0.2重量%）下，在选定的对比度匹配条件。数据已被拟合到各种分析模型，以提取胶束核心和电晕尺寸。SDS显示出诱导部分胶束破坏，同时使聚（环氧乙烷）电晕延伸从25%（无SDS）增加到70%（有SDS）的完全延伸的PEO（114）链。我们的数据在二氧化硅-水界面是相容的胶束的吸附。(C)2004 Elsevier B. V.保留所有权利。
Small-angle neutron scattering is used to investigate the self-assembling behaviour of poly(epsilon-caprolactone)-b-poly(ethylene oxide) diblock copolymers with various block lengths (i) in aqueous solution, (ii) in aqueous solution with the addition of sodium dodecyl sulphate (SDS) and (iii) at the silica-water interface. Micelles are observed under our experimental conditions due to the very small critical micellar concentration of these copolymers (0.01 g/l). The poly(epsilon-caprolactone) core is surrounded by a poly(ethylene oxide) corona. The micellar form factors have been measured at low copolymer concentrations (0.2 wt%) under selected contrast matching conditions. The data have been fitted to various analytical models to extract the micellar core and corona sizes. SDS is shown to induce partial micelle disruption together with an increase of the poly(ethylene oxide) corona extension from 25% (without SDS) to 70% (with SDS) of a completely extended PEO(114) chain. Our data at the silica-water interface are compatible with the adsorption of micelles. (C) 2004 Elsevier B.V. All rights reserved.