Flow Effects on Polymer Transesterification
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I.-K. Yang
Abstract
Transesterification between poly–ε–caprolactone (PCL) and polyethylene-terephthalate (PET) under shear flow was investigated. Two types of flow were imposed to the test samples; one is a simple shear and the other is an oscillatory shear. Comparing to reaction at quiescent state, flow provides better conversion to the reaction. For simple shear flow, the rate of reaction increases as the shear rate increases, while under oscillatory flow, increasing the frequency and the amplitude enhances the extent of reaction. Improvements of the transesterification rate by simple shear prevail over those by the oscillatory motion. The results imply that the transesterification is mass transfer limited. The improvement of the reaction rate and the prevalence of the simple shear flow can be interpreted by the convective effect. The small margin between the rates of reaction under flow and at rest can be attributed to the small Reynolds number of the system.
© 2003, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
- Screw Extrusion
- Modeling and Analysis of Helicoidal Flow in a Conical Extruder
- A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
- Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
- Mixing and Compounding
- Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
- Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
- Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
- Reactive Extrusion
- Flow Effects on Polymer Transesterification
- A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
- Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
- Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
- Die Extrusion
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Molding
- On the Residual Stress and Shrinkage in Injection Compression Molding
Articles in the same Issue
- Contents
- Contents
- Editorial
- First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
- Screw Extrusion
- Modeling and Analysis of Helicoidal Flow in a Conical Extruder
- A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
- Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
- Mixing and Compounding
- Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
- Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
- Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
- Reactive Extrusion
- Flow Effects on Polymer Transesterification
- A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
- Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
- Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
- Die Extrusion
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Flow Balancing in Extrusion Dies for Thermoplastic Profiles
- Molding
- On the Residual Stress and Shrinkage in Injection Compression Molding
