https://doi.org/10.1351/goldbook.14271
Crystallization, within the same crystal, of a polymer and at least one other component.
Note: The following possibilities need to be considered: (1) a polymer and a low-molar-mass species forming a polymer clathrate; (2) a molecular complex of different polymers (see polymer co-crystal); and (3) different polymers displaying some degree of isomorphism (isomorphous polymer co-crystal).