New Results on the Correlation Molecular Architecture-Melt Elasticity-Blowing Process-Film Properties for Conventional and Metallocene-Catalyzed Polyethylenes
✍ Scribed by Virginia Leal; Pilar Lafuente; Raquel Alicante; Ruth Pérez; Anton Santamaría
- Book ID
- 102483385
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 145 KB
- Volume
- 291
- Category
- Article
- ISSN
- 1438-7492
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✦ Synopsis
Abstract
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.
magnified imageDart impact values vs. relaxation spectrum index.