Direct Characterization of In-Plane Phase Separation in Polystyrene Brush/Cyclohexane System

Direct Characterization of In-Plane Phase Separation in Polystyrene Brush/Cyclohexane System
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聚苯乙烯刷/环己烷系统中面内相分离的直接表征

DOI:
10.1021/acs.macromol.6b00151
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发表时间:
2016
期刊:
影响因子:
5.5
通讯作者:
H. Jinnai
H. Jinnai
中科院分区:
化学1区
文献类型:
--
作者:
D. Murakami;Y. Norizoe;Y. Higaki;A. Takahara;H. Jinnai

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首次用环境原子力显微镜研究了聚苯乙烯(PS)刷在环己烷(CHX)中的相行为与接枝密度和温度的关系。三种不同接枝密度的聚苯乙烯刷在平行于基底的方向上表现出岛状、双连续状和孔状微区。由于PS刷的链端之一锚定到基底,这种“面内”微区的尺寸接近PS刷链的端到端距离。随着温度的升高,微畴结构消失,随着温度的降低,具有相同形貌特征的新结构重新出现。这种可逆的温度响应对应于PS刷/CHX系统的面内相分离。与相应的未接枝聚合物溶液相比,PS刷/CHX体系中的UCST型双结点线向稍低的温度偏移,即,PS/CHX系统,在很好的协议与我们以前的Monte Carlo模拟研究。
The phase behavior of polystyrene (PS) brushes in cyclohexane (CHX) was investigated, for the first time, by environmental atomic force microscopy as a function of the graft density and temperature. The polystyrene brushes of three different graft densities exhibited island-, bicontinuous-, and hole-shape microdomains in the direction parallel to the substrate. The size of such “in-plane” microdomains is close to the end-to-end distance of PS brush chain due to the anchoring of one of the chain ends of PS brushes to the substrate. The microdomain structure disappeared as the temperature increased, and new structure with same morphological features reappeared by lowering temperature. This reversible temperature response corresponds to the in-plane phase separation of the PS brush/CHX system. The UCST type binodal line shifted toward slightly lower temperature in the PS brush/CHX system compared to that of the corresponding nongrafted polymer solution, i.e., PS/CHX system, in excellent agreement with our previous Monte Carlo simulation study.
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