Influence of side chain length on the self-assembly of hairy-rod poly(9,9-dialkylfluorene)s in the poor solvent methylcyclohexane

M. Knaapila, F. B. Dias, V. M. Garamus, L. Almásy, M. Torkkeli, K. Leppänen, F. Galbrecht, E. Preis, H. D. Burrows, U. Scherf, A. P. Monkman

Research output: Contribution to journalArticle

68 Citations (Scopus)

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 ßphase 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.

Original languageEnglish
Pages (from-to)9398-9405
Number of pages8
JournalMacromolecules
Volume40
Issue number26
DOIs
Publication statusPublished - Dec 25 2007

Fingerprint

Chain length
Self assembly
Crystalline materials
Polymers
Phase behavior
Isomers
Gels
Cooling
Heating
methylcyclohexane

ASJC Scopus subject areas

  • Materials Chemistry

Cite this

Influence of side chain length on the self-assembly of hairy-rod poly(9,9-dialkylfluorene)s in the poor solvent methylcyclohexane. / 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.

In: Macromolecules, Vol. 40, No. 26, 25.12.2007, p. 9398-9405.

Research output: Contribution to journalArticle

Knaapila, M, Dias, FB, Garamus, VM, Almásy, L, Torkkeli, M, Leppänen, K, Galbrecht, F, Preis, E, Burrows, HD, Scherf, U & Monkman, AP 2007, 'Influence of side chain length on the self-assembly of hairy-rod poly(9,9-dialkylfluorene)s in the poor solvent methylcyclohexane', Macromolecules, vol. 40, no. 26, pp. 9398-9405. https://doi.org/10.1021/ma0715728
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. / Influence of side chain length on the self-assembly of hairy-rod poly(9,9-dialkylfluorene)s in the poor solvent methylcyclohexane. In: Macromolecules. 2007 ; Vol. 40, No. 26. pp. 9398-9405.
@article{a4eb94141f9641f387f827101a0b8def,
title = "Influence of side chain length on the self-assembly of hairy-rod poly(9,9-dialkylfluorene)s in the poor solvent methylcyclohexane",
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 {\ss}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.",
author = "M. Knaapila and Dias, {F. B.} and Garamus, {V. M.} and L. Alm{\'a}sy and M. Torkkeli and K. Lepp{\"a}nen and F. Galbrecht and E. Preis and Burrows, {H. D.} and U. Scherf and Monkman, {A. P.}",
year = "2007",
month = "12",
day = "25",
doi = "10.1021/ma0715728",
language = "English",
volume = "40",
pages = "9398--9405",
journal = "Macromolecules",
issn = "0024-9297",
publisher = "American Chemical Society",
number = "26",

}

TY - JOUR

T1 - Influence of side chain length on the self-assembly of hairy-rod poly(9,9-dialkylfluorene)s in the poor solvent methylcyclohexane

AU - Knaapila, M.

AU - Dias, F. B.

AU - Garamus, V. M.

AU - Almásy, L.

AU - Torkkeli, M.

AU - Leppänen, K.

AU - Galbrecht, F.

AU - Preis, E.

AU - Burrows, H. D.

AU - Scherf, U.

AU - Monkman, A. P.

PY - 2007/12/25

Y1 - 2007/12/25

N2 - 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 ßphase 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.

AB - 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 ßphase 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.

UR - http://www.scopus.com/inward/record.url?scp=38349101287&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38349101287&partnerID=8YFLogxK

U2 - 10.1021/ma0715728

DO - 10.1021/ma0715728

M3 - Article

AN - SCOPUS:38349101287

VL - 40

SP - 9398

EP - 9405

JO - Macromolecules

JF - Macromolecules

SN - 0024-9297

IS - 26

ER -