What characteristics does a crystalline polymer exhibit? a) Thin platelets are surrounded by amorphous regions.
b) Thin platelets with chain folds at the faces
c) They are optically transparent.
d) The boundary between thin platelets define the boundary between crystal regions.

B) Thin platelets with chain folds at the faces

Explanation:

Crystalline polymer is folding together of molecular chain in an ordered way to form lamella. Polymer crystallize after cooling from evaporation of solvent. It affects the properties of the polymer such as thermal property.

Polymer on freezing becomes disorder forming an amorphous solid.