Langmuir monolayer and Langmuir-Blodgett films of amphiphilic triblock copolymers with water-soluble middle block
Langmuir monolayer and Langmuir-Blodgett films of amphiphilic triblock copolymers with water-soluble middle block
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DOI：
10.1007/s00396-006-1527-2
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发表时间：
2006-10-01
影响因子：
2.4
通讯作者：
Kressler, Joerg
中科院分区：
文献类型：
--
作者：
Peetla, Chiranjeevi;Graf, Karlheinz;Kressler, Joerg
分别用表面压强测量和原子力显微镜(AFM)研究了两亲三嵌段共聚物的Langmuir单分子膜和Langmuir-Blodgett(LB)膜的形态。三嵌段共聚物由长的水溶性聚环氧乙烷(PEO)链作为中间嵌段和非常短的聚甲基丙烯酸全氟己基乙酯(PFMA)末端嵌段组成。表面压力-面积等温线显示出刷区的相变。这种相变是由于PFMA嵌段在气-水界面的重排造成的。随着共聚物中PFMA含量的增加，这种影响变得更加明显。在低表面压力下从空气-水界面转移到亲水硅衬底上的Lb薄膜表面胶束的尺寸范围为50-100 nm。在具有很短的PFMA嵌段的共聚物的LB膜中观察到相应PEO均聚物的典型结晶形态，在高表面压力下转移到刷子区域。随着共聚物中PFMA含量的增加，结晶受阻。
Langmuir monolayers and Langmuir-Blodgett (LB) film morphology of amphiphilic triblock copolymers are studied using surface pressure-area measurements and atomic force microscopy (AFM), respectively. The triblock copolymers are composed of long water-soluble poly(ethylene oxide) (PEO) chains as middle block with very short poly(perfluorohexylethyl methacrylate) (PFMA) end blocks. The surface pressure-area isotherms show phase transitions in the brush regime. This phase transition is due to a rearrangement of PFMA block at the air-water interface. It becomes more significant with increasing PFMA content in the copolymer. LB films transferred at low surface pressures from the air-water interface to hydrophilic silicon substrates show surface micelles in the size range of 50-100 nm. A typical crystalline morphology of the corresponding PEO homopolymer is observed in LB films of copolymers with very short PFMA blocks, transferred in the brush region at high surface pressure. This crystallization is hindered with increasing PFMA content in the copolymer.