Shear Modification of Polyolefines and its Integration in Polymer Processing
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G. Ritzau
Abstract
The viscous and especially the elastic properties of polymer melts can be altered by a previously imposed deformation history. This phenomenon, usually termed as shear modification, is caused by the reversible physical disentanglement of the polymer molecule chains. The shearing unit presented in this paper was used to systematically investigate the processing parameters governing shear modification.
A set of rheological tests was carried out with the shear modified sample material and the expected changes in the rheological behaviour were detected. The relative change of the storage modulus G’, measured using a Rheometrics On-line Rheometer system, was taken as a measure for the degree of modification and was found to correlate with the specific energy dissipated during sample preparation. The effects of shear modification on product properties were investigated for the tubular film-blowing process. Changes in the optical and mechanical properties of films which can be attributed to the previously imposed shear modification process were found.
Acknowledgements
I would like to thank BAS F for the raw materials and the molecular data of the LDPE grades. Special thanks also to Prof Arie Ram, Technion, Haifa, Israel for the many fruitful discussions over the past years. Financial support for this research project was given by the West German Federal Ministry for Research and Development (BMFT), project number 03 C 191-9.
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Erratum
Intern. Polymer Processing 1 (1987) 3, p.116
H. Kühnle, Evaluation of the Viscoelastic Temperature and Pressure Shift Factor Over the Full Range of Shear Rates. Equation (26) should read:
© 1987 Hanser Publishers, Munich
Artikel in diesem Heft
- Contents
- Original Contributions
- The Processing Science of Thermoplastic Structural Composites
- Simulation of Balancing Multi-Cavity Molds
- Effect of High Molecular Mass Tail in the Mol Mass Distribution of Polypropylene on Injection Molding
- Flow Visualization Parallel and Perpendicular to the Rotor Axes for Elastomers and Molten Plastics in an Internal Mixer*
- Shear Modification of Polyolefines and its Integration in Polymer Processing
- Recent Studies on Degradation Mechanism of Rubber Vulcanizates by Chemorheology
- Modelling Flow in an Intermeshing Co-rotating Twin Screw Extruder: Flow in Kneading Discs
Artikel in diesem Heft
- Contents
- Original Contributions
- The Processing Science of Thermoplastic Structural Composites
- Simulation of Balancing Multi-Cavity Molds
- Effect of High Molecular Mass Tail in the Mol Mass Distribution of Polypropylene on Injection Molding
- Flow Visualization Parallel and Perpendicular to the Rotor Axes for Elastomers and Molten Plastics in an Internal Mixer*
- Shear Modification of Polyolefines and its Integration in Polymer Processing
- Recent Studies on Degradation Mechanism of Rubber Vulcanizates by Chemorheology
- Modelling Flow in an Intermeshing Co-rotating Twin Screw Extruder: Flow in Kneading Discs
