Numerical Investigation and Experimental Observation of Extrudate Swell for Viscoelastic Polymer Melts
-
M. Kanvisi
, S. Motahari and B. Kaffashi
Abstract
In the present research die swell phenomenon is investigated for the viscoelastic polymer melts both experimentally and by developing a mathematical model in a circular die for high impact polystyrenes (HIPS), high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low density polyethylene (LLDPE). Die swell is generally attributed to the fluid stress field when the fluid flows in a die. The Leonov-like equations as a conformational model are solved simultaneously with dynamic equation of momentum transfer to predict the stress field for a viscoelastic fluid in a circular die. The average molecular weight, the polymer relaxation time and the polymer mobility tensors are determined using the experimental measurements of shear viscosity. Then, based on those data, a model is developed. The results predicted by the model for flow stress field are then used to calculate die swell ratio by Tanner’s analytical model. Die swell ratio is also found out experimentally using a capillary rheometer for the samples. Comparison of the die swell results predicted by the model and measured experimentally show very good agreement for the polymers.
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© 2014, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- The Processing Behavior of Liquid Sn/Molten Polyethylene during Internal Mixing
- Study on Packing Phase Control Based on the Cavity Pressure-Temperature during Injection Molding
- Synthesis and Properties of a Novel Intumescent Flame Retardant and its Application in LLDPE
- The Mechanism of Neck-in Phenomenon in Film Casting Process
- Morphology, Mechanical and Thermal Properties of Recycled PC/ABS Blends Processed via Vane Extruder
- Thermal Conductivity of Polypropylene Composites with Combined Boron Nitride Fillers
- Characterization on Biodegradation of Enzymatically Synthesized Polylactic Acid by Using Alkaline Protease and Lipase
- Numerical Investigation and Experimental Observation of Extrudate Swell for Viscoelastic Polymer Melts
- Processing and Wear Analysis of Blast Furnace Slag Filled Polypropylene Composites Using Taguchi Model and ANN
- Microchannel Deformation of Polymer Chip in In-Mold Bonding
- Synthesis and Characteristics of Graft Copolymerization of Starch-G-PAM Using A Twin-Roll Mixer as Reactor for Cornstarch with Different Amylose/Amylopectin Ratios
- Experimental Investigation of PC-Films Using Optical Measurements
- Effect of Compounding Conditions on Static and Dynamic Mechanical Properties of High Density Polyethylene/Ground Tire Rubber Blends
- Effect of Feeding Strategy on the Mechanical Properties of PP/Recycled EPDM/PP-G-MA Blends
- Synthesis and Characterization of Chitosan & Amino Acid Superabsorbent Hydrogels
- Rapid Communications
- Negative Pressures in Modelling Rotating Polymer Processing Machinery Are Meaningless, But They Are Telling Something
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- The Processing Behavior of Liquid Sn/Molten Polyethylene during Internal Mixing
- Study on Packing Phase Control Based on the Cavity Pressure-Temperature during Injection Molding
- Synthesis and Properties of a Novel Intumescent Flame Retardant and its Application in LLDPE
- The Mechanism of Neck-in Phenomenon in Film Casting Process
- Morphology, Mechanical and Thermal Properties of Recycled PC/ABS Blends Processed via Vane Extruder
- Thermal Conductivity of Polypropylene Composites with Combined Boron Nitride Fillers
- Characterization on Biodegradation of Enzymatically Synthesized Polylactic Acid by Using Alkaline Protease and Lipase
- Numerical Investigation and Experimental Observation of Extrudate Swell for Viscoelastic Polymer Melts
- Processing and Wear Analysis of Blast Furnace Slag Filled Polypropylene Composites Using Taguchi Model and ANN
- Microchannel Deformation of Polymer Chip in In-Mold Bonding
- Synthesis and Characteristics of Graft Copolymerization of Starch-G-PAM Using A Twin-Roll Mixer as Reactor for Cornstarch with Different Amylose/Amylopectin Ratios
- Experimental Investigation of PC-Films Using Optical Measurements
- Effect of Compounding Conditions on Static and Dynamic Mechanical Properties of High Density Polyethylene/Ground Tire Rubber Blends
- Effect of Feeding Strategy on the Mechanical Properties of PP/Recycled EPDM/PP-G-MA Blends
- Synthesis and Characterization of Chitosan & Amino Acid Superabsorbent Hydrogels
- Rapid Communications
- Negative Pressures in Modelling Rotating Polymer Processing Machinery Are Meaningless, But They Are Telling Something
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts