Melt Strength Behavior of PE and its Relation to Bubble Stability in Film Blowing**
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A. Ghijsels
Abstract
Melt strength data are presented on the three major classes of commercial polyethylenes (LDPE, LLDPE and HDPE). The LDPE samples studied were polymerised by both tubular and autoclave reactor technology and the LLDPE samples were produced with different α-olefins as comonomer. Melt strength was assessed from uniaxial tensile experiments with a Rheotens apparatus. The melt strengths of both LLDPEs and HDPEs are much lower than those of LDPEs when compared at equal melt index or zero-shear viscosity level. Among the LDPEs the highest melt strength is observed for the LDPEs made by autoclave technology. The type of comonomer present in LLDPEs does not significantly affect its melt strength. The molecular factors controlling the melt strength of pure polyethylenes are discussed. A high melt strength is identified with a good bubble stability in the film blowing process.
© 1990, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Original Contributions
- Innovative Extrusion Systems for Advanced Fiber and Film Extrusion
- Influence of Melting Zone and Melt Homogeneity on Extrusion and Injection Molding Processes
- Further Considerations of Simulation of Flow in Pin Barrel Extruders and in Screw Extruders with Sliced Flights
- Deformation Fields and Residence Time Distributions in Polymer Melt Flows
- Flow History – Morphology Development in Crystallizable Polymer Melts
- Rheological Studies on Solutions of Poly-p-phenylene Terephthalamide in H2SO4
- Instability Phenomena in Film Casting Process
- Influence of Stretching and Cooling Conditions in Cast Film Extrusion of PP Films
- Melt Strength Behavior of PE and its Relation to Bubble Stability in Film Blowing**
- Dynamics of Double Bubble Tabular Film Process for Producing Biaxially oriented Nylon 6 Film
- A Finite Difference Study of Roll Design in Calendering Processing
Artikel in diesem Heft
- Contents
- Contents
- Original Contributions
- Innovative Extrusion Systems for Advanced Fiber and Film Extrusion
- Influence of Melting Zone and Melt Homogeneity on Extrusion and Injection Molding Processes
- Further Considerations of Simulation of Flow in Pin Barrel Extruders and in Screw Extruders with Sliced Flights
- Deformation Fields and Residence Time Distributions in Polymer Melt Flows
- Flow History – Morphology Development in Crystallizable Polymer Melts
- Rheological Studies on Solutions of Poly-p-phenylene Terephthalamide in H2SO4
- Instability Phenomena in Film Casting Process
- Influence of Stretching and Cooling Conditions in Cast Film Extrusion of PP Films
- Melt Strength Behavior of PE and its Relation to Bubble Stability in Film Blowing**
- Dynamics of Double Bubble Tabular Film Process for Producing Biaxially oriented Nylon 6 Film
- A Finite Difference Study of Roll Design in Calendering Processing
