Segmental Relaxation Dynamics of the Core and Corona in a Single Dry Micelle,Macromolecules

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Segmental Relaxation Dynamics of the Core and Corona in a Single Dry Micelle
Macromolecules ( IF 5.1 ) Pub Date : 2017-12-28 00:00:00 , DOI: 10.1021/acs.macromol.7b02237
Weizhao Ren ₁ , Yuping Wang ₁ , Xin Chen ₁ , Biao Zuo ₁ , Xianjing Zhou ₁ , Xinping Wang ₁

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The segmental relaxation dynamics of the core and the corona in a single dry spherical micelle comprising a polystyrene (PS) or poly(methyl methacrylate) (PMMA) core and a poly(acrylic acid) (PAA) corona, along with the effects of the micelle density and the chain length of the core-forming and corona-forming polymers, were investigated by AFM. The results showed that the segmental relaxation temperature in the micelle core was close to its bulk T_g and independent of the micellar structure, such as micelle size, density, and corona thickness. By contrast, the segmental relaxation temperature in the micelle corona is dependent on the micellar structure. The depressed chain mobility in the corona was enhanced as the micelle density and the length of both the corona-forming and core-forming blocks increased. This phenomenon was attributed to conformational entropy loss in the micelle corona because of the chain adopting a conformation more perpendicular to the core as the micelle size and density increased.

中文翻译：

单个干胶束中核和电晕的节段弛豫动力学

在包含聚苯乙烯（PS）或聚（甲基丙烯酸甲酯）（PMMA）核和聚（丙烯酸）（PAA）电晕的单个干燥球形胶束中，核和电晕的分段弛豫动力学，以及原子力显微镜研究了形成核和形成电晕的聚合物的胶束密度和链长。结果表明，胶束核心的节段弛豫温度接近其体温T _g。并且与胶束结构无关，例如胶束大小，密度和电晕厚度。相反，胶束电晕中的段弛豫温度取决于胶束结构。随着胶束密度的增加以及电晕形成和形成核的嵌段的长度增加，电晕中抑制的链迁移率增加。这种现象归因于胶束电晕中的构象熵损失，因为随着胶束大小和密度的增加，链采用的构象更垂直于核。

更新日期：2017-12-28

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