Two-dimensional polymers investigated by scanning near-field optical microscopy: Phase separation of polymer blend monolayer
Two-dimensional polymers investigated by scanning near-field optical microscopy: Phase separation of polymer blend monolayer
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DOI：
10.1021/jp0032412
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发表时间：
2001-04
影响因子：
3.3
通讯作者：
H. Aoki;S. Ito
中科院分区：
文献类型：
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作者：
H. Aoki;S. Ito
采用扫描近场光学显微镜（SNOM）研究了染料标记的聚甲基丙烯酸十八酯（PODMA）和聚甲基丙烯酸异丁酯（PiBMA）在空气/水界面形成稳定单分子膜的共混物单分子膜的相分离行为。在PODMA富集区观察到能量转移发射，表明存在两种组分在分子水平上混合的区域。当聚合物共混物溶液铺展到水面上时，PODMA链倾向于聚集并在PODMA和PiBMA彼此完全分离之前形成固体状域。这归因于PODMA的长烷基的强结晶性。当温度升高到40 °C时，相分离几乎在几分钟内完成，然后畴尺寸随着退火时间增加。利用时间分辨自近场光学显微镜研究了完全相分离单层膜的二维结构。近距离.
Scanning near-field optical microscopy (SNOM) was employed for investigating the phase separation behavior of a polymer blend monolayer which consisted of dye-labeled poly(octadecyl methacrylate) (PODMA) and poly(isobutyl methacrylate) (PiBMA), both forming stable monolayers at the air/water interface. The energy transfer emission was observed in the PODMA rich domain, indicating that there existed the area where both components were mixed at the molecular level. When the polymer blend solution is spread onto a water surface, the PODMA chains tend to aggregate and form a solidlike domain before the PODMA and PiBMA separate completely from each other. This is attributed to the strong crystallinity of the long alkyl group of PODMA. When the temperature was raised to 40 °C, the phase separation was almost completed in several minutes, and then the domain size increased with annealing time. The two-dimensional structure for the completely phase-separated monolayer was studied by time-resolved SNOM. A near-fie...