Rheological properties, shrinkage and melt spinning instability of blends of linear polyolefins with low density polyethylene

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Abstract
A comparative study is presented of the influence of addition of a long chain branched low density polyethylene LDPE on the rheological and processing characteristics of a high density polyethylene (HDPE), a polypropylene (PP), and a polybutene‐1 (PB). The influence of the LDPE on the PP and PB are most striking. Substantial increases in normal stresses, “shrinkage” of extruded filaments, and melt spinning stability are observed. The effects are much smaller for the HDPE blends.