polymorphic polymer crystal

https://doi.org/10.1351/goldbook.14225
Polymer crystal formed by domains of different crystal polymorphs of the same polymer.
Note: Isotactic polypropylene has been shown to form crystals containing \(\ce{\upalpha\mbox{-}}\) and \(\ce{\upgamma\mbox{-}phase}\) domains in which well-defined relationships between the lattices of the two phases in different domains are preserved.
Source:
PAC, 2011, 83, 1831. (Definitions of terms relating to crystalline polymers (IUPAC Recommendations 2011)) on page 1846 [Terms] [Paper]