Fig. 33. SEM images taken at cryofracture surface of (a) PLA/20 wt% NR. (b) PLA/30 wt% NR, (c) PLA/20 wt% NR-GMA vulcanizate, and (e) PLA/30 wt% NR-GMA vulcanizate. SEM images impact-fracture surface of (d) PLA/20 wt% NR-GMA and (f) PLA/30 wt% NR-GMA. Ref. 160, copyright 2017. Reproduced with permission from American Chemical Society.