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

*此作品的通信作者

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46 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)6572-6578
頁數7
期刊Macromolecules
40
發行號18
DOIs
出版狀態已出版 - 04 09 2007
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