Table 3.

Contact angles and calculated surface energies of PM6, Y6, and Y6-eC6-BO with or with 0.5% CN treatment obtained from the contact angle measurements and the resulting Flory-Huggins interaction parameters of PM6:Y6 and PM6:Y6-eC6-BO blend films.

Material	${\theta }_{\text{Water}}$a)	${\theta }_{\text{EG}}$b)	$\gamma$(mN/m)	$(\sqrt{{\gamma }_{\text{PM}6}}-\sqrt{{\gamma }_{\text{NFA}}}$)2
PM6	110.475	82.813	24.65	-
Y6	98.244	64.297	37.16	1.28
Y6-eC6-BO	100.163	73.076	26.09	0.02
PM6 (0.5% CN)	105.942	83.453	18.61	-
Y6 (0.5% CN)	103.342	75.921	26.09	0.63
Y6-eC6-BO (0.5% CN)	96.744	71.613	24.46	0.40

a) Water contact angles;

b) Ethylene glycol contact angles