Towards general guidelines for aligned, nanoscale assemblies of hairy-rod polyfluorene

被引:104
作者
Knaapila, M
Stepanyan, R
Lyons, BP
Torkkeli, M
Monkman, AP
机构
[1] Univ Durham, Dept Phys, Durham DH1 3LE, England
[2] Univ Twente, Dept Appl Phys, NL-7500 AE Enschede, Netherlands
[3] Univ Helsinki, Dept Phys Sci, FI-00014 Helsinki, Finland
关键词
D O I
10.1002/adfm.200500419
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
This account highlights recent progress towards understanding the complex hierarchical levels of solid-state structure in a prototypical helical hairy-rod polyfluorene, poly[9,9-bis(2-ethylhexy)fluorene-2,7-diyl] (or PF2/6). This branched-side-chain containing polyfluorene undergoes a systematic intermolecular self-assembly and liquid-crystalline phase behavior in combination with uniaxial and biaxial alignment. The latter processes yield full three-dimensional orientation of the crystallites and polymer chains. Also reviewed are the impact of the molecular structure and phase behavior on surface morphology, anisotropic film formation, and, ultimately, the overall impact of these physical attributes on optical constants. This particular polyfluorene also represents a model system for demonstrating the applicability of mean-field theory in detailing the self-organization of aligned hairy-rod block-copolymer systems. These results of PF2/6 are compared to those of other archetypical pi-conjugated hairy-rod polymers. General guidelines of how molecular weight influences nanostructure, phase behavior alignment, and surface morphology are given.
引用
收藏
页码:599 / 609
页数:11
相关论文
共 107 条
[11]   Polyphenylene nanostructures [J].
Berresheim, AJ ;
Müller, M ;
Müllen, K .
CHEMICAL REVIEWS, 1999, 99 (07) :1747-1785
[12]   Supramolecular organization of highly conducting organic thin films by the Langmuir-Blodgett technique [J].
Bjornholm, T ;
Hassenkam, T ;
Reitzel, N .
JOURNAL OF MATERIALS CHEMISTRY, 1999, 9 (09) :1975-1990
[13]   Smectic structures in electrochemically prepared poly(3,4-ethylenedioxythiophene) films [J].
Breiby, DW ;
Samuelsen, EJ ;
Groenendaal, L ;
Struth, B .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 2003, 41 (09) :945-952
[14]   New synchrotron radiation sources and the next-generation light sources [J].
Hasnain, SS ;
Kamitsubo, H ;
Mills, DM .
JOURNAL OF SYNCHROTRON RADIATION, 2001, 8 :1171-1171
[15]   A STRUCTURAL STUDY OF POLY (PARA-PHENYLENE VINYLENE) [J].
CHEN, D ;
WINOKUR, MJ ;
MASSE, MA ;
KARASZ, FE .
POLYMER, 1992, 33 (15) :3116-3122
[16]   Molecular packing in crystalline poly(9,9-di-n-octyl-2,7-fluorlene) [J].
Chen, SH ;
Chou, HL ;
Su, AC ;
Chen, SA .
MACROMOLECULES, 2004, 37 (18) :6833-6838
[17]   Noncrystalline phases in poly(9,9-di-n-octyl-2,7-fluorene) [J].
Chen, SH ;
Su, AC ;
Chen, SA .
JOURNAL OF PHYSICAL CHEMISTRY B, 2005, 109 (20) :10067-10072
[18]   Crystalline forms and emission behavior of poly(9,9-di-n-octyl-2,7-fluorene) [J].
Chen, SH ;
Su, AC ;
Su, CH ;
Chen, SA .
MACROMOLECULES, 2005, 38 (02) :379-385
[19]   Near-term aging and thermal behavior of polyfluorene in various aggregation states [J].
Cheun, H ;
Tanto, B ;
Chunwaschirasiri, W ;
Larson, B ;
Winokur, MJ .
APPLIED PHYSICS LETTERS, 2004, 84 (01) :22-24
[20]   Packing and uniaxial alignment of liquid crystalline oligofluorenes [J].
Chi, CY ;
Lieser, G ;
Enkelmann, V ;
Wegner, G .
MACROMOLECULAR CHEMISTRY AND PHYSICS, 2005, 206 (16) :1597-1609