Crystallization of polypropylene
This tapping/height mode image shows the morphology of a polypropylene spherulite with a large portion of the γ-modification of i-PP. The sample was crystallized from the melt at 130°C, and etched with potassium permanganate.
For more details see:
"Influence of stereoirregularities on the formation of the γ-phase in isotactic polypropene"
Ralf Thomann, Hinnerk Semke, Ralph-Dieter Maier, Yi Thomann, Jonas Scherble, Rolf Mülhaupt, Jörg Kressler
Polymer 42, (10), (2001), pp. 4597-4603.
