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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/5960


    Title: Segmental Alignment in the Aggregate Domains of Poly(9,9-dioctylfluorene) in Semidilute Solution
    Authors: M. Habibur Rahman
    Chun-Yu Chen
    Shao-Ching Liao
    Hsin-Lung Chen
    Cheng-Si Tsao
    Jean-Hong Chen (陳建宏)
    Jing-Long Liao
    Viktor A. Ivanov
    Show-An Chen
    Date: 2007
    Issue Date: 2009-11-24 06:31:44 (UTC+8)
    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.
    Relation: Macromolecules 2007, 40, 6572-6578
    Appears in Collections:[材料工程系所] 期刊論文

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