Segmental alignment in the aggregate domains of poly(9,9-dioctylfluorene) in semidilute solution

M. Habibur Rahman; Chun Yu Chen; Shao Ching Liao; Hsin Lung Chen; Cheng Si Tsao; Jean Hong Chen; Jing Long Liao; Viktor A. Ivanov; Show An Chen

doi:10.1021/ma071036f

Segmental alignment in the aggregate domains of poly(9,9-dioctylfluorene) in semidilute solution

M. Habibur Rahman, Chun Yu Chen, Shao Ching Liao, Hsin Lung Chen^*, Cheng Si Tsao, Jean Hong Chen, Jing Long Liao, Viktor A. Ivanov, Show An Chen

^*Corresponding author for this work

Research output: Contribution to journal › Journal Article › peer-review

46 Scopus citations

Abstract

The structure of poly(9,9-dioctylfluorene-2,7-diyl) (PF8) in deuterated toluene solutions at concentrations ranging from 0.60% to 7.0% (w/v) has been investigated by means of small-angle neutron scattering (SANS) and nuclear magnetic resonance (NMR) spectroscopy. PF8 chains exhibited aggregation above 1.0%, where the corresponding SANS profiles were characterized by the superposition of an aggregate component and a dynamic component associated with the transient network formed by interchain overlap. The ¹H NMR resonance lines for both the polymer as well as for the residual protons in the solvent showed large upfield shift at higher concentrations, indicating strong polymer-solvent interaction. At a higher concentration (4.5%) an additional resonance line was observed in the aromatic regions of both the ¹H and the ²H spectra that has been attributed to a residual anisotropic chemical shift of the solvent molecules. The later phenomenon is suggestive of the existence of magnetically anisotropic aggregate domains of PF8 dispersed in an isotropic bulk.

Original language	English
Pages (from-to)	6572-6578
Number of pages	7
Journal	Macromolecules
Volume	40
Issue number	18
DOIs	https://doi.org/10.1021/ma071036f
State	Published - 04 09 2007
Externally published	Yes

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title = "Segmental alignment in the aggregate domains of poly(9,9-dioctylfluorene) in semidilute solution",

abstract = "The structure of poly(9,9-dioctylfluorene-2,7-diyl) (PF8) in deuterated toluene solutions at concentrations ranging from 0.60% to 7.0% (w/v) has been investigated by means of small-angle neutron scattering (SANS) and nuclear magnetic resonance (NMR) spectroscopy. PF8 chains exhibited aggregation above 1.0%, where the corresponding SANS profiles were characterized by the superposition of an aggregate component and a dynamic component associated with the transient network formed by interchain overlap. The 1H NMR resonance lines for both the polymer as well as for the residual protons in the solvent showed large upfield shift at higher concentrations, indicating strong polymer-solvent interaction. At a higher concentration (4.5%) an additional resonance line was observed in the aromatic regions of both the 1H and the 2H spectra that has been attributed to a residual anisotropic chemical shift of the solvent molecules. The later phenomenon is suggestive of the existence of magnetically anisotropic aggregate domains of PF8 dispersed in an isotropic bulk.",

author = "Rahman, {M. Habibur} and Chen, {Chun Yu} and Liao, {Shao Ching} and Chen, {Hsin Lung} and Tsao, {Cheng Si} and Chen, {Jean Hong} and Liao, {Jing Long} and Ivanov, {Viktor A.} and Chen, {Show An}",

year = "2007",

month = sep,

day = "4",

doi = "10.1021/ma071036f",

language = "英语",

volume = "40",

pages = "6572--6578",

journal = "Macromolecules",

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publisher = "American Chemical Society",

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T1 - Segmental alignment in the aggregate domains of poly(9,9-dioctylfluorene) in semidilute solution

AU - Rahman, M. Habibur

AU - Chen, Chun Yu

AU - Liao, Shao Ching

AU - Chen, Hsin Lung

AU - Tsao, Cheng Si

AU - Chen, Jean Hong

AU - Liao, Jing Long

AU - Ivanov, Viktor A.

AU - Chen, Show An

PY - 2007/9/4

Y1 - 2007/9/4

N2 - The structure of poly(9,9-dioctylfluorene-2,7-diyl) (PF8) in deuterated toluene solutions at concentrations ranging from 0.60% to 7.0% (w/v) has been investigated by means of small-angle neutron scattering (SANS) and nuclear magnetic resonance (NMR) spectroscopy. PF8 chains exhibited aggregation above 1.0%, where the corresponding SANS profiles were characterized by the superposition of an aggregate component and a dynamic component associated with the transient network formed by interchain overlap. The 1H NMR resonance lines for both the polymer as well as for the residual protons in the solvent showed large upfield shift at higher concentrations, indicating strong polymer-solvent interaction. At a higher concentration (4.5%) an additional resonance line was observed in the aromatic regions of both the 1H and the 2H spectra that has been attributed to a residual anisotropic chemical shift of the solvent molecules. The later phenomenon is suggestive of the existence of magnetically anisotropic aggregate domains of PF8 dispersed in an isotropic bulk.

AB - The structure of poly(9,9-dioctylfluorene-2,7-diyl) (PF8) in deuterated toluene solutions at concentrations ranging from 0.60% to 7.0% (w/v) has been investigated by means of small-angle neutron scattering (SANS) and nuclear magnetic resonance (NMR) spectroscopy. PF8 chains exhibited aggregation above 1.0%, where the corresponding SANS profiles were characterized by the superposition of an aggregate component and a dynamic component associated with the transient network formed by interchain overlap. The 1H NMR resonance lines for both the polymer as well as for the residual protons in the solvent showed large upfield shift at higher concentrations, indicating strong polymer-solvent interaction. At a higher concentration (4.5%) an additional resonance line was observed in the aromatic regions of both the 1H and the 2H spectra that has been attributed to a residual anisotropic chemical shift of the solvent molecules. The later phenomenon is suggestive of the existence of magnetically anisotropic aggregate domains of PF8 dispersed in an isotropic bulk.

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U2 - 10.1021/ma071036f

DO - 10.1021/ma071036f

M3 - 文章

AN - SCOPUS:34748830492

SN - 0024-9297

VL - 40

SP - 6572

EP - 6578

JO - Macromolecules

JF - Macromolecules

IS - 18

ER -

Segmental alignment in the aggregate domains of poly(9,9-dioctylfluorene) in semidilute solution

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