A Study of Concentrated Suspensions in Polyethylene Melts and the Impact on Viscosity and Polymer Processing Operations
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M. D. Wetzel
Abstract
Filled polymer compounds can present processing challenges, including poor dispersive mixing, high screw shaft torque and energy consumption, flow instabilities, and significant increases in melt pressures and temperatures. Previous theoretical development and experimental evaluations of polymer melts filled with particulate solids showed that the viscosity can be described with a model based on percolation theory concepts. This paper describes a batch mixer characterization method developed to measure the effects of filler concentration and operating conditions on the melt viscosity and process response. Experimental results are compared with capillary rheometer measurements using several low-density polyethylene resins, calcium carbonate and titanium dioxide. The theoretical treatment of the viscosity as a particulate percolating system with power-law behavior was used to analyze and compare rheometer and batch mixer data. The effects of resin molecular weight, filler type and size on viscosity and melt processing were examined and there was good agreement between rheometer and mixer viscosity trends, and percolation model predictions. The laboratory experiments and model estimates provide quantitative information that can be used to develop and troubleshoot extrusion compounding, single screw extrusion and low-shear forming processes.
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© 2018, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- Characterizing Ultrasonic Micro-Molding Process of Polyetheretherketone (PEEK)
- Innovative Materials for Novel Concepts for Internal Heat Exchangers
- Thermoplastic Blends of PP and Waste Rubber Powder: Effects of Compatibilizer on Tensile Properties, Thermal Behavior and Decomposition Kinetics
- Morphology Influence of Nanoporous Nickel Phosphate on Intumescent Flame Retardant Polypropylene Composites
- Electrospun Nanofiber-Based Cardo Poly(aryl ether sulfone) Containing Zwitterionic Side Groups as Novel Proton Exchange Membranes
- Modeling of Solid Conveying Pressure Throughput Behavior of Single Screw Smooth Barrel Extruders under Consideration of Backpressure and High Screw Speeds
- Morphology and Properties of Unvulcanized and Dynamically Vulcanized PVC/NBR Blend Reinforced by Graphene Nanoplatelets
- Investigation of Thermal and Dielectric Properties of Epoxy Based Hybrid Composites for Microelectronics Applications
- Electrical, Morphological and Thermal Properties of Microinjection Molded Polypropylene/Multi-Walled Carbon Nanotubes Nanocomposites
- Production of Thermoplastic Elastomers Based on Recycled PE and Ground Tire Rubber: Morphology, Mechanical Properties and Effect of Compatibilizer Addition
- Influence of PA6 as a Charring Agent on Flame Retardancy, Thermal and Mechanical Properties of LGFR PP Composites
- Numerical Investigations of Fiber Orientation Models for Injection Molded Long Fiber Composites
- Relaxation Behavior of Core-Shell Particles in PP/PMMA/PS Ternary Blends: The Effects of Composition, Viscosity Ratio and Temperature
- Effect of Addition of Styrene-Ethylene/Butylene-Styrene and the Type of Mica on the Mechanical Properties of Mica-Filled Polyethylene/Polypropylene Blends
- A Study of Concentrated Suspensions in Polyethylene Melts and the Impact on Viscosity and Polymer Processing Operations
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- Characterizing Ultrasonic Micro-Molding Process of Polyetheretherketone (PEEK)
- Innovative Materials for Novel Concepts for Internal Heat Exchangers
- Thermoplastic Blends of PP and Waste Rubber Powder: Effects of Compatibilizer on Tensile Properties, Thermal Behavior and Decomposition Kinetics
- Morphology Influence of Nanoporous Nickel Phosphate on Intumescent Flame Retardant Polypropylene Composites
- Electrospun Nanofiber-Based Cardo Poly(aryl ether sulfone) Containing Zwitterionic Side Groups as Novel Proton Exchange Membranes
- Modeling of Solid Conveying Pressure Throughput Behavior of Single Screw Smooth Barrel Extruders under Consideration of Backpressure and High Screw Speeds
- Morphology and Properties of Unvulcanized and Dynamically Vulcanized PVC/NBR Blend Reinforced by Graphene Nanoplatelets
- Investigation of Thermal and Dielectric Properties of Epoxy Based Hybrid Composites for Microelectronics Applications
- Electrical, Morphological and Thermal Properties of Microinjection Molded Polypropylene/Multi-Walled Carbon Nanotubes Nanocomposites
- Production of Thermoplastic Elastomers Based on Recycled PE and Ground Tire Rubber: Morphology, Mechanical Properties and Effect of Compatibilizer Addition
- Influence of PA6 as a Charring Agent on Flame Retardancy, Thermal and Mechanical Properties of LGFR PP Composites
- Numerical Investigations of Fiber Orientation Models for Injection Molded Long Fiber Composites
- Relaxation Behavior of Core-Shell Particles in PP/PMMA/PS Ternary Blends: The Effects of Composition, Viscosity Ratio and Temperature
- Effect of Addition of Styrene-Ethylene/Butylene-Styrene and the Type of Mica on the Mechanical Properties of Mica-Filled Polyethylene/Polypropylene Blends
- A Study of Concentrated Suspensions in Polyethylene Melts and the Impact on Viscosity and Polymer Processing Operations
- PPS News
- PPS News
- Seikei Kakou Abstracts
- Seikei-Kakou Abstracts