Fig. 7 (a) Rotational rheometer viscosity measurements of P3HT solutions in o-xylene (1 wt%) at
25
C for different molecular weight compositions obtained by mixing A-M w (M w ¼ 72.8 kg/mol)
and L-M w (M w ¼ 26.2 kg/mol) in different proportions [51]. Full lines were generated by linear fits
to the experimental viscosity evolution. Inset: the slope of the linear fits for increasing contents of
L-M w mixed with A-M w (0, 50, 80, and 90 wt%). (b) Photographic images and sketches of the
two-step process of polymer gelation for P3HT (M w ¼ 72.8 kg/mol) in o-xylene solution (1 wt%).
(Reprinted with permission from Koppe et al. [51]. Copyright (2009) American Chemical Society)
Morphology of P3HT in Thin Films
53
25
C for different molecular weight compositions obtained by mixing A-M w (M w ¼ 72.8 kg/mol)
and L-M w (M w ¼ 26.2 kg/mol) in different proportions [51]. Full lines were generated by linear fits
to the experimental viscosity evolution. Inset: the slope of the linear fits for increasing contents of
L-M w mixed with A-M w (0, 50, 80, and 90 wt%). (b) Photographic images and sketches of the
two-step process of polymer gelation for P3HT (M w ¼ 72.8 kg/mol) in o-xylene solution (1 wt%).
(Reprinted with permission from Koppe et al. [51]. Copyright (2009) American Chemical Society)
Morphology of P3HT in Thin Films
53