Micellization behavior of diblock copolymers in solution near the critical micelle temperature
Micellization behavior of diblock copolymers in solution near the critical micelle temperature
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DOI：
10.1016/s0032-3861(99)00697-7
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发表时间：
2000-06-01
期刊：
影响因子：
4.6
通讯作者：
Nose, T
中科院分区：
文献类型：
--
作者：
Fukumine, Y;Inomata, K;Nose, T
研究了聚苯乙烯嵌段聚二甲基硅氧烷 (PS-b-PDMS) 在 1,2-二氯苯/苯甲醇混合溶剂中在临界胶束温度 (c.m.t.) 附近的胶束化行为，形成以 PDMS 为核心的胶束。静态和动态光散射实验已经证明了以下行为。稀溶液（c 等于 0.1-4 wt%）根据共聚物浓度 c 显示出三种不同的特征行为。在浓缩区，散射光强度的温度依赖性在c.m.t.以下出现一个大峰，这与反常胶束化类似。详细的光散射研究表明：在该浓度区，在低温下形成致密的胶束，随着温度的升高，胶束在一定温度下不连续地转变为膨胀的膨胀胶束。这种变化是相当可逆地发生的，并且可以通过由于溶剂质量随着温度降低而降低而导致核心的强烈冷凝来解释。这可能是异常胶束化的机制。 (C) 2000 Elsevier Science Ltd. 保留所有权利。
Micellization behavior near the critical micelle temperature (c.m.t.) has been studied for polystyrene-block-poly(dimethylsiloxane) (PS-b-PDMS) in a mixed solvent of 1,2-dichlorobenzene/benzyl alcohol, which forms micelles with PDMS as cores. Static and dynamic light scattering experiments have demonstrated the following behaviors. The dilute solution (c congruent to 0.1-4 wt%) shows three different characteristic behaviors depending on the copolymer concentration c. In the concentrated region, the temperature dependence of scattered-light intensity exhibits a large peak just below c.m.t., which is similar to the anomalous micellization, Detailed light scattering studies have revealed the following: in this concentration region, compact micelles are formed at low temperatures and as the temperature is increased, the micelles change into expanded swollen micelles discontinuously at a certain temperature. This change occurs rather reversibly, and may be explained by a strong condensation of the core due to the decrease in solvent quality with decreasing temperature. This can be a mechanism of the anomalous micellization. (C) 2000 Elsevier Science Ltd. All rights reserved.