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Solvent-Regulated Mesoscale Aggregation Properties of Dilute PBTTT-C14 Solutions

Contrasting mesoscale aggregate features of a promising conjugated polymer, poly(2,5-bis(3-tetradecylthiophene-2-yl)thieno[3,2-b]thiophenes) (pBTTT-C14), that result from the use of two slightly different aromatic solvents, i.e., toluene and chlorobenzene, for a range of dilute solutions (0.5–1.2 mg/mL) are systematically explored using depolarized dynamic light scattering (DDLS), dynamic/static light scattering (DLS/SLS), small-angle X-ray scattering (SAXS), and scanning transmission electron/scanning electron/transmission electron microscopy (STEM/SEM/TEM) analysis schemes. The central findings are as follows: (1) DDLS and all EM features reveal that whereas pBTTT-C14 aggregate clusters fostered in toluene (a poorer solvent) are moderately anisotropic (cylindrical; aspect ratio ∼3) in shape, they are nearly isotropic (spherical) in chlorobenzene (a better solvent), with mean sizes in the range of a few hundred nanometers. (2) Combined DDLS/DLS/SLS/SAXS analyses indicate that the aggregate clusters in bo...

Authors:   Han L. Yi; Ching H. Wu; Chun I Wang; Chi C. Hua
Journal:   Macromolecules
Year:   2017
DOI:   10.1021/acs.macromol.7b00790
Publication date:   11-Jul-2017
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