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CONFORMATION OF A CONJUGATED POLYELECTROLYTE IN AQUEOUS SOLUTION: SMALL ANGLE NEUTRON SCATTERING.

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Title: CONFORMATION OF A CONJUGATED POLYELECTROLYTE IN AQUEOUS SOLUTION: SMALL ANGLE NEUTRON SCATTERING.
Authors: Wang, Deli1 (AUTHOR), Moses, Daniel2 (AUTHOR), Bazan, GuillermoC.2 (AUTHOR), Heeger, AlanJ.2 (AUTHOR), Lal, Jyostana3 (AUTHOR)
Source: Journal of Macromolecular Science: Pure & Applied Chemistry. Dec2001, Vol. 38 Issue 12, p1175-1189. 15p. 2 Charts.
Subjects: Polyelectrolytes, Scattering (Physics), Polymers, Luminescence
Abstract: Small angle neutron scattering (SANS) by a conjugated, luminescent polyelectrolyte, poly[5-methoxy-2-(4-sulfobutoxy)-1,4-phenylenevinylene] (MBL-PPV), was investigated at semi-dilute concentrations in aqueous solution at room temperature. The polymer conformation was studied in pure deteurated water and in solutions with added salt, in solutions with added dicationic quencher and in solutions with added surfactant. A single broad peak in the scattered intensity, I(q), was observed for all concentrations in salt free solutions; the peak position and peak intensity per monomer unit scale with the MBL-PPV concentration as qm ∼ c1/2 and I(qm)/c ∼ c-1/2, respectively. The upturn of I(q) at low q (q<0.08Å--) results from aggregation of the polymer chains; the sizes of the aggregates increase with increasing concentration. The addition of excess salt completely removes the broad peak from the scattering pattern as the salt ions screen the repulsive interchain electrostatic interaction. In high salt solutions, I(q) ∼ q--, over a wide range of q, indicating a rigid-rod conformation for the conjugated chains with persistence length greater than 800Å. Cationic surfactant, DTA, was found to separate the polyelectrolyte chains from each other. Initial experiments in the presence of dicationic quencher indicate an increase in the aggregate size. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Macromolecular Science: Pure & Applied Chemistry is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: CONFORMATION OF A CONJUGATED POLYELECTROLYTE IN AQUEOUS SOLUTION: SMALL ANGLE NEUTRON SCATTERING.
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  Data: Small angle neutron scattering (SANS) by a conjugated, luminescent polyelectrolyte, poly[5-methoxy-2-(4-sulfobutoxy)-1,4-phenylenevinylene] (MBL-PPV), was investigated at semi-dilute concentrations in aqueous solution at room temperature. The polymer conformation was studied in pure deteurated water and in solutions with added salt, in solutions with added dicationic quencher and in solutions with added surfactant. A single broad peak in the scattered intensity, I(q), was observed for all concentrations in salt free solutions; the peak position and peak intensity per monomer unit scale with the MBL-PPV concentration as qm ∼ c1/2 and I(qm)/c ∼ c-1/2, respectively. The upturn of I(q) at low q (q&lt;0.08&#197;--) results from aggregation of the polymer chains; the sizes of the aggregates increase with increasing concentration. The addition of excess salt completely removes the broad peak from the scattering pattern as the salt ions screen the repulsive interchain electrostatic interaction. In high salt solutions, I(q) ∼ q--, over a wide range of q, indicating a rigid-rod conformation for the conjugated chains with persistence length greater than 800&#197;. Cationic surfactant, DTA, was found to separate the polyelectrolyte chains from each other. Initial experiments in the presence of dicationic quencher indicate an increase in the aggregate size. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Journal of Macromolecular Science: Pure &amp; Applied Chemistry is the property of Taylor &amp; Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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        Value: 10.1081/MA-100108376
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      – Code: eng
        Text: English
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        PageCount: 15
        StartPage: 1175
    Subjects:
      – SubjectFull: Polyelectrolytes
        Type: general
      – SubjectFull: Scattering (Physics)
        Type: general
      – SubjectFull: Polymers
        Type: general
      – SubjectFull: Luminescence
        Type: general
    Titles:
      – TitleFull: CONFORMATION OF A CONJUGATED POLYELECTROLYTE IN AQUEOUS SOLUTION: SMALL ANGLE NEUTRON SCATTERING.
        Type: main
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          Name:
            NameFull: Wang, Deli
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            NameFull: Moses, Daniel
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            NameFull: Bazan, GuillermoC.
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            NameFull: Heeger, AlanJ.
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            – D: 01
              M: 12
              Text: Dec2001
              Type: published
              Y: 2001
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              Value: 38
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            – TitleFull: Journal of Macromolecular Science: Pure & Applied Chemistry
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