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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.
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页码:599 / 609
页数:11
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