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Title: Influence of Side Chain Length on the Self-Assembly
Authors: Knaapila, M. 
Dias, F. B. 
Garamus, V. M. 
Almásy, L. 
Torkkeli, M. 
Leppänen, K. 
Galbrecht, F. 
Preis, E. 
Burrows, H. D. 
Scherf, U. 
Monkman, A. P. 
Issue Date: 25-Dec-2007
Publisher: American Chemical Society
Citation: Macromolecules. 40:26 (2007) 9398-9405
Abstract: We report on the phase behavior of poly(9,9-dihexylfluorene) (PF6), poly(9,9-diheptylfluorene) (PF7), poly(9,9-dioctylfluorene) (PF8), poly(9,9-dinonylfluorene) (PF9), and poly(9,9-didecylfluorene) (PF10) in methylcyclohexane (MCH). After a heating−cooling cycle, in the 10−50 mg/mL concentration range, PF6/MCH, PF7/MCH, PF8/MCH, and PF9/MCH systems were found to be gel-like, while PF10/MCH appears less viscous. PF6/MCH, PF7/MCH, PF8/MCH, and PF9/MCH form large (10−100 nm) sheetlike assemblies (thickness of 2−3 nm). The larger length scale structures of these sheets show an odd−even dependence on the side chain (spacer) length: the PF6 and PF8 sheets are broader and thinner, whereas PF7 and PF9 sheets are thicker with a putative double layer structure. PF10 does not follow this sequence, and only part of the polymer is assembled into a sheetlike structure, the rest remaining dissolved at the molecular level. PF8/MCH and PF9/MCH mixtures also have lower length scale crystalline structures with an internal period corresponding to the periodicity observed in the solid-state β phase of PF8. Vestiges of crystalline domains are found for PF6 and PF7 but not for PF10. PF7/MCH, PF8/MCH, and PF9/MCH systems contain the conformational isomer Cβ, of those chains observed in the β phase, while this is not observed with other polymer/MCH systems.
ISSN: 0024-9297
DOI: 10.1021/ma0715728
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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