X-ray diffraction study of the structure of thin polyfluorene films

被引:113
作者
Kawana, S
Durrell, M
Lu, J
Macdonald, JE
Grell, M
Bradley, DDC
Jukes, PC
Jones, RAL
Bennett, SL
机构
[1] SERC, Daresbury Lab, CLRC, Warrington WA4 4AD, Cheshire, England
[2] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England
[3] Univ Wales Coll Cardiff, Dept Phys & Astron, Cardiff CF2 3YB, S Glam, Wales
[4] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
基金
英国工程与自然科学研究理事会;
关键词
polyfluorene; grazing incidence X-ray diffraction; thin films;
D O I
10.1016/S0032-3861(01)00753-4
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 molecular arrangement in thin films of poly(9,9-dioctylfluorene) and poly(9,9-dihexylfluorene) deposited on silicon substrates has been investigated with grazing incidence X-ray diffraction. In particular, the effect of the interface on the molecular orientation is highlighted. Both materials display a periodicity normal to the surface arising from stacked sheets of fluorene chains in both the crystalline and liquid crystalline phases. For the crystalline phase, a periodicity in the plane of the surface of 4.15 Angstrom is observed corresponding to half the fluorene ring repeat distance along the backbone, consistent with interdigitating side-chains. For crystalline films deposited onto rubbed polyimide films, strong orientation effects are observed. In the liquid-crystalline phase, this strong in-plane ordering of backbones is lost. Poly(9,9-dihexylfluorene) exhibits an additional degree of ordering in the plane of the interface, which is likely to arise from hexagonal ordering of the backbone chains. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1907 / 1913
页数:7
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