Polymer Rheology

1. Front Matter

   Pages i-xvi

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2. The Characterisation of Viscous Flow. Viscosity, Shear Rate and Shear Stress

   • R. S. Lenk

   Pages 1-14

3. The Time Dependence of Viscous Flow. Thixotropy and Rheopexy

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   Pages 15-20

4. The Temperature Dependence of Viscous Flow. Free Volume

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   Pages 21-29

5. The Influence of Pressure on the Viscosity of Polymer Melts. Viscosity and Molecular Weight

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   Pages 31-39

6. Vectors and Tensors. Fundamental Equations

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   Pages 41-59

7. The Analysis of Steady-State Flow in Rectangular and Cylindrical Channels

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   Pages 61-73

8. The Hagen-Poiseuille Equation and the Rabinowitsch Correction. The Pressure Drop in Tapered Channels

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   Pages 75-85

9. Pressure Drop in Wire Coating Dies. Two-Dimensional Flow in Extruder Screws

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   Pages 87-94

10. Coextrusion

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    Pages 95-99

11. The Effect of Melt Elasticity on Extrusion and Other Melt Processing Operations

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    Pages 101-112

12. The Rheology of Calendering

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    Pages 113-122

13. Stretching Flows

    • F. N. Cogswell

    Pages 123-139

14. The Rheology of Injection Moulding

    • I. T. Barrie

    Pages 141-163

15. Deformation in the Solid State—Small Strains

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    Pages 165-192

16. Deformation in the Solid State—Large Strains

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    Pages 193-218

17. Deformation in the Solid State—Cyclic Strains

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    Pages 219-239

18. Critical Strain

    • J. Pohrt

    Pages 241-254

19. Critical Strain: The Effect of Processing History and Associated Factors

    • J. Pohrt

    Pages 255-278

20. Critical Strain: An Engineer’s View of the Energy Balance During Deformation

    • J. Pohrt

    Pages 279-306

Everything flows, so rheology is a universal science. Even if we set aside claims of such width, there can be no doubt of its importance in polymers. It joins with chemistry in the polymerisation step but polymer engineering is supreme in all the succeeding steps. This is the area concerned with the fabrication of the polymer into articles or components, with their design to meet the needs in service, and with the long and short term performance of the article or component. This is a typical area of professional engineering activity, but one as yet without its proper complement of professional engineers. An understanding of polymer rheology is the key to effective design and material plus process selection, to efficient fabrication, and to satisfactory service, yet few engineers make adequate use of what is known and understood in polymer rheology. Its importance in the flow processes of fabrication is obvious. Less obvious, but equally important, are the rheological phenomena which determine the in-service performance. There is a gap between the polymer rheologist and the polymer engineer which is damaging to both parties and which contributes to a less than satisfactory use of polymers in our society. It is important that this gap be filled and this book makes an attempt to do so. It presents an outline of what is known in a concise and logical fashion. It does this starting from first principles and with the minimum use of complex mathematics.

• Coextrusion
• Extruder
• Extrusion
• deformation
• elasticity
• morphology
• polymer
• rheology

• Polytechnic of the South Bank, London, UK

  R. S. Lenk

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