A study of the different structural phases of the polymer poly(9,9′-dioctyl fluorene) using Raman spectroscopy
A study of the different structural phases of the polymer poly(9,9′-dioctyl fluorene) using Raman spectroscopy
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DOI：
10.1016/s0379-6779(00)00456-2
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发表时间：
2001-01-15
期刊：
影响因子：
4.4
通讯作者：
Strohriegl, P
中科院分区：
文献类型：
--
作者：
Ariu, M;Lidzey, DG;Strohriegl, P
聚合物聚（9,9′-二辛基芴）（F8）可以通过不同的热处理或溶剂处理很容易地在许多不同的结构相之间驱动。我们已经确定的相包括(i)自旋包覆，（ii）半晶，（iii）玻璃状，（iv）具有扩展的链内构象。原子力显微镜已经被用来研究与聚合物的不同相和不同的溶剂浇铸薄膜相关的表面结构。对这些样品进行了拉曼光谱分析，以了解聚合物构象如何随相变化。可以观察到峰的相对强度的变化和能量的变化。我们比较了具有丁基侧链和丙烯酸酯/羟基端基通过己基间隔剂连接在芴主链上的芴三聚体的Fs谱。我们发现一个非常小的频率色散在振动模式连接到增加的共轭长度。因此，三聚体的振动模式的分配对于理解F8谱是非常重要的。(C) 2001 Elsevier Science B.V.版权所有
The polymer poly(9,9'-dioctyl fluorene) (F8) can be easily driven between a number of different structural phases by different thermal or solvent treatments. The phases which we have identified include (i) as-spin-coated, (ii) semi-crystalline, (iii) glassy, (iv) with an extended intrachain conformation. Atomic force microscopy has been used to investigate the surface structures associated with the different phases of the polymer and different solvents used to cast the film. Raman spectroscopy has been performed on these samples to understand how the polymer conformation changes with the phases. Variations in the relative intensity of the peaks and shifts in energy are observed. We have compared the Fs spectrum with a trimer of fluorene with butyl side chains and acrylate/hydroxy endgroups attached to the fluorene main chain via hexyl spacers. We identify a very small frequency dispersion in the vibrational modes connected to an increase of the conjugation length. Therefore, the assignment of the vibrational modes of the trimer is very important for understanding the F8 spectrum. (C) 2001 Elsevier Science B.V. All rights reserved.