immiscible polymer blend

Also contains definition of: heterogeneous polymer blend

https://doi.org/10.1351/goldbook.IT07240

polymer blend that exhibits immiscibility.

Source:
PAC, 2004, 76, 1985. 'Definition of terms related to polymer blends, composites, and multiphase polymeric materials (IUPAC Recommendations 2004)' on page 1990 (https://doi.org/10.1351/pac200476111985)