371307.fig.003a
(a)
371307.fig.003b
(b)
371307.fig.003c
(c)
371307.fig.003d
(d)
Figure 3: SEM micrographs showing the cross-sections of dry PHB films with different amounts of PAA nanogels: (a) (w/w) PAA; (b) (w/w) PAA; (c) (w/w) PAA, and (d) (w/w) PAA.