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The development of poly(9,9-dioctylfluorene) from solutions to solution processed films in terms of β-conformation: Perspective of molecular weight and solvent quality.
- Source :
-
Polymer . Mar2024, Vol. 295, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- We report how the solution structure, β-conformation and film morphology develop in poly(9,9-dioctylfluorene) (PFO) solutions and suspensions, as well as in subsequently prepared films when the molecular weight and solvent quality are systematically varied in toluene-acetone mixtures. The polymer series with molecular weights ranging from 10 kDa to 100 kDa is prepared using the precipitation fraction. The β conformation is favored by increasing molecular weight (≥30 kDa) and decreasing solvent quality (≥45 % acetone content). The content of the β conformation in the films is significantly increased when the β conformation already exists in precursor suspensions. In contrast, when there is no β conformation in the precursor solution, no β conformation will appear in the films. The mechanisms of phenomenological transformation are discussed. This work is a step toward developing quantitative guidelines for controlling PFO solutions and their film properties. [Display omitted] • β conformation of PFO is influenced by molecular weight and mixed solvent, in both solutions and films. • The β conformation and chain structure of the film are partially related to the solution. • Aggregates in solution can form sheet-like aggregates or even network. • The β content in film is higher than that in solution due to the spin-out of liquid rich in α. [ABSTRACT FROM AUTHOR]
- Subjects :
- *MOLECULAR weights
*SOLVENTS
*ACETONE
Subjects
Details
- Language :
- English
- ISSN :
- 00323861
- Volume :
- 295
- Database :
- Academic Search Index
- Journal :
- Polymer
- Publication Type :
- Academic Journal
- Accession number :
- 175569543
- Full Text :
- https://doi.org/10.1016/j.polymer.2024.126748