720209.fig.004a
(a)
720209.fig.004b
(b)
720209.fig.004c
(c)
720209.fig.004d
(d)
Figure 4: SEM image of the white pattern region of the ABS specimen after thermal aging at 260°C for (a) 0 min, (b) 10 min, (c) 20 min, and (d) 60 min.