Synthesis of poly(n-butyl acrylate)-block-poly(acrylic acid) diblock copolymers by ATRP and their micellization in water
Synthesis of poly(n-butyl acrylate)-block-poly(acrylic acid) diblock copolymers by ATRP and their micellization in water
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DOI：
10.1021/ma0609578
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发表时间：
2007-06-12
期刊：
影响因子：
5.5
通讯作者：
Mueller, Axel H. E.
中科院分区：
文献类型：
--
作者：
Colombani, Olivier;Ruppel, Markus;Mueller, Axel H. E.
两亲性二嵌段共聚物，聚（丙烯酸正丁酯）-嵌段-聚（丙烯酸）（PnBA-PAA），具有窄分子量分布（PDI 4.7）。芘的稳态荧光光谱和荧光相关光谱研究表明存在一个很低的临界胶束浓度（cmc约为10（-8）mol/L）。胶束的数均流体动力学半径，由FCS测定，范围从28至55 μ m，这取决于PAA块长度。FCS数据表明，胶束的大小显着减少稀释无盐系统。这归因于这些自组装纳米结构的动态但动力学控制的行为。在盐水溶液中，胶束尺寸在“表观”cmc（cmc*）以上保持恒定，这归因于胶束之间单聚物交换的较慢动力学。
Amphiphilic diblock copolymers, poly(n-butyl acrylate)-block-poly(acrylic acid) (PnBA-PAA), with narrow molecular weight distribution (PDI 4.7. Pyrene steady-state fluorescence spectroscopy and fluorescence correlation spectroscopy (FCS) studies indicate the existence of a very low critical micelle concentration (cmc similar to 10(-8) mol/L). The number-average hydrodynamic radii of the micelles, as determined by FCS, range from 28 to 55 urn, depending on the PAA block length. FCS data indicate that micellar sizes significantly decrease upon dilution for salt-free systems. This is attributed to a dynamic, but kinetically controlled, behavior of these self-assembled nanostructures. In saline solutions the micellar sizes remain constant above the "apparent" cmc (cmc*), which is attributed to slower dynamics of unimer exchange between micelles.