Continuous Melt Polymerization of Polyetherimides
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L. R. Schmidt
Abstract
A new process for continuous melt polymerization of aromatic dianhydrides and diamines has been developed. The process consists of several integrated stages: feeding, melting, devolatilization, mixing, and advanced polymerization. The transport phenomena and coupled reaction rates have been studied in a corotating, intermeshing twin-screw reactor/extruder. Each stage in this process has been analyzed. The results show the importance of viscous heat for melting monomers, free surface generation in mass transfer, total shear strain in distributive mixing, and back mixing for extended residence time and advanced polymerization. High molecular weight polyetherimide (Mw 50 × 103) was obtained with this process for a variety of conditions. The reactions were run with 3 mole % of monofunctional anhydride to cap the polymer ends at a specific molecular weight for the most desirable balance of mechanical and physical properties.
© 1989, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Original Contributions
- New Aspects in the Design of Extruders with a Forced Feeding Section
- Flow of Rubber Compound in a Pin Barrel Screw Extruder
- Foam Processing with Rigid Polyvinylchloride
- A Model for Single-screw Plasticating Extruders
- Effect of Screw Stagger on Mixing in a Tangential Counter-Rotating Twin Screw Extruder
- Mixing, Devolatilization, and Reactive Processing in the a Farrel Continuous Mixer**
- Investigations of the Residence Time and the Longitudinal Mixing Behavior in Counter-rotating Twin Screw Extruders
- Flow in a Modular Intermeshing Co-rotating Twin Screw Extruder
- Continuous Melt Polymerization of Polyetherimides
Articles in the same Issue
- Contents
- Contents
- Original Contributions
- New Aspects in the Design of Extruders with a Forced Feeding Section
- Flow of Rubber Compound in a Pin Barrel Screw Extruder
- Foam Processing with Rigid Polyvinylchloride
- A Model for Single-screw Plasticating Extruders
- Effect of Screw Stagger on Mixing in a Tangential Counter-Rotating Twin Screw Extruder
- Mixing, Devolatilization, and Reactive Processing in the a Farrel Continuous Mixer**
- Investigations of the Residence Time and the Longitudinal Mixing Behavior in Counter-rotating Twin Screw Extruders
- Flow in a Modular Intermeshing Co-rotating Twin Screw Extruder
- Continuous Melt Polymerization of Polyetherimides
