Structural anisotropy of poly(alkylthiophene) films

被引:165
作者
Aasmundtveit, KE [1 ]
Samuelsen, EJ
Guldstein, M
Steinsland, C
Flornes, O
Fagermo, C
Seeberg, TM
Pettersson, LAA
Inganäs, O
Feidenhans'l, R
Ferrer, S
机构
[1] NTNU, Inst Fys, N-7491 Trondheim, Norway
[2] Linkoping Univ, Inst Fys & Mattekn, S-58183 Linkoping, Sweden
[3] Forskningsctr Riso, DK-4000 Roskilde, Denmark
[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France
关键词
D O I
10.1021/ma991631k
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The structural anisotropy of various poly(alkylthiophene) films have been studied by X-ray diffraction, using both conventional methods and synchrotron radiation at grazing incidence. Solution-cast films orient with the side chains preferably normal to the film surface, whereas spin-cast films of nonstereoregular material orient with both the main and the side chains in the film plane. For thick (10-50 mu m) solution-cast films, the degree of orientation depends strongly on the solvent used for casting, and on the stereoregularity of the polymer, films of stereoregular materials being more oriented than those of nonregular materials. The most oriented nonregular films are those cast from mixtures of chloroform and tetrahydrofuran. Thin (50-500 nm) solution-cast films are more oriented than the thicker ones, and the effects of different stereoregularity or different casting solvents are small. For spin-cast films, the degree of orientation is independent of substrate and solvent. Spin-cast films of stereoregular material have two different phases: One with the side chains normal to the substrate, and another where they are parallel to the substrate. The diffraction peaks of spin-cast poly(octylthiophene) narrow considerably upon heating.
引用
收藏
页码:3120 / 3127
页数:8
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