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New Results on the Correlation Molecular Architecture‐Melt Elasticity‐Blowing Process‐Film Properties for Conventional and Metallocene‐Catalyzed Polyethylenes
Author(s) -
Leal Virginia,
Lafuente Pilar,
Alicante Raquel,
Pérez Ruth,
Santamaría Anton
Publication year - 2006
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.200600072
Subject(s) - materials science , elasticity (physics) , viscoelasticity , metallocene , bubble , composite material , blowing agent , polymer , polymerization , mechanics , physics , polyurethane
Summary: Melt elasticity of a series of conventional and metallocene‐catalyzed PEs is investigated. The samples show very noticeable differences in their molecular architecture, including a variable degree of LCB and MWD. Four parameters ( De , RSI, recoverable shear and steady state compliance), determined through dynamic viscoelastic measurements, are correlated with molecular architecture and blown film properties. RSI parameter shows a particular capacity to discern the LCB effect from the MWD effect on PE melt elasticity. Enhancing melt elasticity improves bubble stability, but provokes more haze and poorer impact properties in the film.Dart impact values vs. relaxation spectrum index.