Startseite Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
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Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends

  • G. Adebayo , P. Koombhongse und M. Cakmak
Veröffentlicht/Copyright: 3. Juni 2013
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International Polymer Processing
Aus der Zeitschrift International Polymer Processing Band 18 Heft 3

Abstract

The phase behavior of two partially miscible polymer blends in simple shear flow was monitored on-line by Raman spectroscopy and subsequently with optical light microscopy on the resulting extrudate. Emphasis was placed on investigating the phase behavior in two polymer blend systems of high and low shear viscosity as they flow through a custom built flow cell with slit conduit. Shear flows initiated from one- and two-phase temperatures were monitored in the higher viscosity blend system of poly(α-methyl styrene–co-acrylonitrile) (PαMSAN) and poly(methyl methacrylate) (PMMA). For the second lower viscosity blend of poly(styrene–co-acrylonitrile) (PSAN) and PMMA90, shear flow was conducted at one-phase temperature and various shear stresses. These blends exhibit a lower critical solution temperature (LCST). The chosen blend composition used for PαMSAN/PMMA had the widest miscibility window in view of the high viscosity of the neat polymers, while for PSAN/PMMA90 blend, a composition very close to the LCST was investigated for the shear flow effects. We observed that for a blend composition of PαMSAN/PMMA system, at small temperature gap from the quiescent cloud point curve, the morphological effects due to shear heating overrides other effects. For a lower melt viscosity blend composition of PSAN/PMMA90, shear induced demixing initially occurs at low shear rates, shear-induced mixing regime follows with increasing shear flow prior to the onset of shear heating effects that brings the material to two phase region resulting in creation of locally optically observable demixed regions where the temperature rise due to shear heating across the extrudate are at maximum.

* Mail address: M. Cakmak, Institute of Polymer Engineering, University of Akron, Akron, OH 44325-0301, USA
Received: 2002-2-21
Accepted: 2003-3-20
Published Online: 2013-06-03
Published in Print: 2003-09-01

© 2003, Carl Hanser Verlag, Munich

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Editorial
  4. First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
  5. Screw Extrusion
  6. Modeling and Analysis of Helicoidal Flow in a Conical Extruder
  7. A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
  8. Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
  9. Mixing and Compounding
  10. Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
  11. Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
  12. Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
  13. Reactive Extrusion
  14. Flow Effects on Polymer Transesterification
  15. A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
  16. Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
  17. Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
  18. Die Extrusion
  19. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  20. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  21. Molding
  22. On the Residual Stress and Shrinkage in Injection Compression Molding
https://doi.org/10.3139/217.1749

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Editorial
  4. First in a Series: Polymer Processing in Developing Countries Polymer Processing in Peru
  5. Screw Extrusion
  6. Modeling and Analysis of Helicoidal Flow in a Conical Extruder
  7. A Powerful Universal Plasticating System for Single-screw-extruders and Injection-moulding Machines
  8. Cross Channel Flow Velocity and Motion Trajectory of Polymers in a Helical Channel
  9. Mixing and Compounding
  10. Influence of Low Molecular Weight Additives on Die Extrusion Rheometer Flow of Thermoplastic Melts
  11. Design of a Static Temperature Scanning Ultrasonic Measurement System and Application to Multi-phase Polymer Systems
  12. Raman Spectroscopy as an On-line Technique to Monitor Shear Flow Effect on Partially Miscible Polymer Blends
  13. Reactive Extrusion
  14. Flow Effects on Polymer Transesterification
  15. A Dynamic Model Accounting for Oscillating Behavior in Reactive Extrusion
  16. Study on Functionalization of Isotactic PP with Maleic Anhydride in an Internal Mixer and a Twin-screw Extruder
  17. Quality Aspects on the Power Cable Core Insulation Extrusion and Thermal Curing Process
  18. Die Extrusion
  19. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  20. Flow Balancing in Extrusion Dies for Thermoplastic Profiles
  21. Molding
  22. On the Residual Stress and Shrinkage in Injection Compression Molding
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