Details

Autor(en) / Beteiligte

• Emerson, Jillian A
• Toolan, Daniel T. W
• Howse, Jonathan R
• Furst, Eric M
• Epps, Thomas H

Titel

Determination of Solvent–Polymer and Polymer–Polymer Flory–Huggins Interaction Parameters for Poly(3-hexylthiophene) via Solvent Vapor Swelling

Ist Teil von

• Macromolecules, 2013-08, Vol.46 (16), p.6533-6540

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We report the use of solvent vapor swelling of ultrathin polymer films to determine Flory–Huggins solvent–polymer and polymer–polymer interaction parameters (χ i–j ) for poly(3-hexylthiophene) (P3HT) and polystyrene (PS) over a wide solvent composition range. From the calculated interaction parameters, we constructed a polymer/polymer/solvent phase diagram that was validated experimentally. χtetrahydrofuran–P3HT (1.04 ± 0.04) and χCHCl3–P3HT (0.99 ± 0.01) were determined through swelling of ultrathin P3HT films. Similar experiments using PS films gave χtetrahydrofuran–PS = 0.41 ± 0.02 and χCHCl3–PS = 0.39 ± 0.01, consistent with literature values. As expected, these χ i–j parameters indicated that P3HT is less compatible than PS with either solvent. From δPS (17.9 ± 0.2 MPa1/2) and δP3HT (14.8 ± 0.2 MPa1/2), determined through regular solution theory, we calculated χPS–P3HT = 0.48 ± 0.06 at 23 °C. The resulting phase diagram was validated by solution-based transmission measurements of PS/P3HT blends in o-xylene. Although we focused on PS/P3HT blends in this work, this approach is easily adaptable to other polymer/polymer combinations of interest.