Effect of Processing History on the Sintering of Ethylene Copolymers
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S. A. Guillén-Castellanos
Abstract
Polymer sintering plays a major role in processes such as rotational molding, governing the heating cycle and the properties of the final parts. There is evidence to suggest that the material molecular structure, molecular order and morphology are of importance in the sintering process. To date, however, there has been no satisfactory explanation as for their role in polymer sintering. One objective of this work is to examine the sintering behavior of ethylene copolymers under conditions related to the rotational molding process and to determine the relative effects of the polymer molecular structure and morphology on the sintering process. Sintering experiments were conducted under isothermal and non-isothermal conditions using both powder and cylindrical particles. It was found that the trends observed for the sintering of powder were consistent with the predictions of Newtonian sintering models. Sintering results obtained using cylindrical particles, however, showed significant differences not seen when using powder particles. These were attributed to the differences in the surface area between the two types of particles. It is speculated that the effect of material properties other than viscosity and elasticity are enhanced when cylindrical particles are used.
© 2003, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- Polymorphic and Crystal Structures from Crystallization in Polymer Processing
- Compounding/Screw Extrusion
- Flow Properties and Morphology of PC/LCP Blends Affected by the Addition of Glass Fiber and Resulted Mutual Influences
- Modeling Filler Dispersion along a Twin-Screw Extruder
- Characterisation of Finite Length Composites
- Single Screw Extrusion of Natural Fibre Reinforced Thermoplastics (NFRTP)
- Fiber and Film
- A New Method to Determine the Filament Force Tension within the Fibre Formation Zone
- Diameter Profile Measurements for CO2 Laser Heated Drawing Process of PET Fiber
- Stress Induced Crystallization in Elongational Flow
- Improved Spinnability of Metallocene Polyethylenes by Using Processing Aids
- Melt Spinning of Reactive Extruded and/or Blended Polymer Fibers by Means of an Online Coupled Twin Screw Extruder
- Cast Film Problem: A Non Isothermal Investigation
- Rotational Molding
- Effect of Processing History on the Sintering of Ethylene Copolymers
- Injection Molding
- Five Geometric Principles for Injection Molding
- Modelling of Residual Stresses and Warpage in Sandwich Injection Moulding
Articles in the same Issue
- Contents
- Contents
- Editorial
- Polymorphic and Crystal Structures from Crystallization in Polymer Processing
- Compounding/Screw Extrusion
- Flow Properties and Morphology of PC/LCP Blends Affected by the Addition of Glass Fiber and Resulted Mutual Influences
- Modeling Filler Dispersion along a Twin-Screw Extruder
- Characterisation of Finite Length Composites
- Single Screw Extrusion of Natural Fibre Reinforced Thermoplastics (NFRTP)
- Fiber and Film
- A New Method to Determine the Filament Force Tension within the Fibre Formation Zone
- Diameter Profile Measurements for CO2 Laser Heated Drawing Process of PET Fiber
- Stress Induced Crystallization in Elongational Flow
- Improved Spinnability of Metallocene Polyethylenes by Using Processing Aids
- Melt Spinning of Reactive Extruded and/or Blended Polymer Fibers by Means of an Online Coupled Twin Screw Extruder
- Cast Film Problem: A Non Isothermal Investigation
- Rotational Molding
- Effect of Processing History on the Sintering of Ethylene Copolymers
- Injection Molding
- Five Geometric Principles for Injection Molding
- Modelling of Residual Stresses and Warpage in Sandwich Injection Moulding
