Rheology and Processing of Molten Poly(methyl methacrylate) Resins
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C. Stamboulides
Abstract
The rheological and processing behavior in capillary extrusion of several poly(methyl methacrylate) (PMMA) resins was studied. The rheological characterization included: (i) frequency sweep experiments at various temperatures and application of the time-temperature superposition to obtain the master curves from which the activation energy of flow was found to be independent of molecular weight, (ii) extensional measurements using the Sentmanat Extensional Rheometer (SER) where it was found that poly(methyl methacrylate) resins exhibit strain hardening effects only at high strain rates. The capillary extrusion experiments were performed for three poly(methyl methacrylate) resins using additives in order to identify suitable processing aids for PMMA resins. First it was found that poly(methyl methacrylate) polymers exhibit spiral/helical type of distortions at a critical shear stress value of about 0.35 ± 0.03 MPa, independent of temperature and molecular weight. “Traditional” processing aids used mainly in the extrusion of polyolefins and some other commercial polymers were found ineffective in eliminating instabilities in the case of poly(methyl methacrylate) processing. On the other hand, mixing of poly(methyl methacrylate) with a proprietary blend of synthetic resins and fatty glycerides with modified organic fatty acids, MoldWiz INT-35UDH, was able to reduce the extrusion pressure and postpone the onset of gross melt fracture to higher shear rates. Finally and most importantly, the addition of different polyethylenes (LLDPE, LDPE and HDPE) resulted into a significant pressure reduction along with significant postponement of gross melt fracture to higher shear rates.
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© 2006, Hanser Publishers, Munich
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Pressure and Temperature Dependence of LDPE Viscosity and Free Volume: The Effect of Molecular Structure
- Correlations between Injection Molding Parameters, Morphology and Mechanical Properties of PPS Using Artificial Neural Networks
- Investigations into Kinematic Reversal in Non-isothermal Flows in Single-screw Machines
- The Effect of Post-extrusion Conditions in Ribbon Extrusion of Polymer Blends
- Effect of the Chemical and Morphological Conditions of the Die Wall on the Extrusion of Linear Polyolefins
- Investigation of the Heat Affected Zone of Hot-gas Welded PP Joints
- Method for the Optimisation of Screw Elements for Tightly Intermeshing, Co-rotating Twin Screw Extruders
- Rheology and Processing of Molten Poly(methyl methacrylate) Resins
- PLLA Morphology Controlled by Dry-cast Process
- Two Component Injection Molding of Phase Separating Blends
- A Low Force Valve for Dynamic Control of Molten Plastics in a Mold
- Influence of Drawing and Temperature on the Optical and Structural Properties of Monofilament PP Sutures
- Mechanical Properties of Rubber-toughened Post-industrial Glass-fiber-reinforced PA66
- Thermal Flow Instability in Metal Injection Molding: Experiment and Simulation
- Review Paper
- State of the Art: Recycling of EPDM Rubber Vulcanizates
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Regular Contributed Articles
- Pressure and Temperature Dependence of LDPE Viscosity and Free Volume: The Effect of Molecular Structure
- Correlations between Injection Molding Parameters, Morphology and Mechanical Properties of PPS Using Artificial Neural Networks
- Investigations into Kinematic Reversal in Non-isothermal Flows in Single-screw Machines
- The Effect of Post-extrusion Conditions in Ribbon Extrusion of Polymer Blends
- Effect of the Chemical and Morphological Conditions of the Die Wall on the Extrusion of Linear Polyolefins
- Investigation of the Heat Affected Zone of Hot-gas Welded PP Joints
- Method for the Optimisation of Screw Elements for Tightly Intermeshing, Co-rotating Twin Screw Extruders
- Rheology and Processing of Molten Poly(methyl methacrylate) Resins
- PLLA Morphology Controlled by Dry-cast Process
- Two Component Injection Molding of Phase Separating Blends
- A Low Force Valve for Dynamic Control of Molten Plastics in a Mold
- Influence of Drawing and Temperature on the Optical and Structural Properties of Monofilament PP Sutures
- Mechanical Properties of Rubber-toughened Post-industrial Glass-fiber-reinforced PA66
- Thermal Flow Instability in Metal Injection Molding: Experiment and Simulation
- Review Paper
- State of the Art: Recycling of EPDM Rubber Vulcanizates
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
