morphology in which phase domains have shapes with one dimension much larger than the other two dimensions.
Note:
Fibrillar phase domains have the appearance of fibres.
Source:
PAC, 2004, 76, 1985. 'Definition of terms related to polymer blends, composites, and multiphase polymeric materials (IUPAC Recommendations 2004)' on page 2003 (https://doi.org/10.1351/pac200476111985)