This series includes technical reports prepared by faculty, students and staff who are affiliated with the Polymers Research Group in the Department of Chemical Engineering at Queen’s University. These reports are intended to furnish rapid communication to persons who have an active interest in the subject matter and to stimulate comment, including corrections of possible errors.

Recent Submissions

  • Exact-solution for Cone-plate Viscometry 

    Giacomin, A. Jeffrey; Gilbert, Peter H. (2017-08)
    The viscosity of a Newtonian fluid is often measured by confining the fluid to the gap between a rotating cone that is perpendicular to a fixed disk. We call this experiment cone-plate viscometry. When the cone angle ...
  • Fluid Elasticity in Plastic Pipe Extrusion: Loads on Die Barrel 

    Saengow, Chaimongkol; Giacomin, A. Jeffrey (2017-07)
    In large thick plastic pipe extrusion, the residence in the cooling chamber is long, and the melt inside the pipe sags under its own weight, causing the product to thicken on the bottom (and to thin on the top). To compensate ...
  • Elastomers in Large-Amplitude Oscillatory Uniaxial Extension Revisited 

    Dessi, Claudia; Vlassopoulos, Dimitris; Giacomin, A. Jeffrey; Saengow, Chaimongkol (2017-07)
    In this work, we subject elastomers to a fixed pre-stretch in uniaxial extension, ε p , upon which a large-amplitude, ε 0 , oscillatory uniaxial extensional (LAOE) deformation is superposed. We find that if both ε p and ε ...
  • Elastomers in Oscillatory Uniaxial Extension 

    Dessi, Claudia; Vlassopoulos, Dimitris; Giacomin, A. Jeffrey; Saengow, Chaimongkol (2016-02)
    In this work, we subject elastomers to a fixed pre-stretch in uniaxial extension, ε p , upon which a large-amplitude, ε 0 , oscillatory uniaxial extensional (LAOE) deformation is superposed. We find that if both ε p and ε ...
  • Normal Stress Differences from Oldroyd 8-Constant Framework: Exact Analytical Solution for Large-Amplitude Oscillatory Shear Flow 

    Saengow, Chaimongkol; Giacomin, A. Jeffrey (2017-03)
    The Oldroyd 8-constant framework for continuum constitutive theory contains a rich diversity of popular special cases for polymeric liquids. In this paper, we use part of our exact solution for shear stress to arrive at ...
  • Exact Analytical Solution for Large-Amplitude Oscillatory Shear Flow from Oldroyd 8-Constant Framework: Shear Stress 

    Saengow, Chaimongkol; Giacomin, A. Jeffrey; Kolitawong, Chanyut (2017-01)
    The Oldroyd 8-constant model is a continuum framework containing, as special cases, many important constitutive equations for elastic liquids. When polymeric liquids undergo large-amplitude oscillatory shear flow, the shear ...
  • Polymer Processing Partitioning Approach: Extruding Plastic Pipe 

    Saengow, Chaimongkol (2016-01)
    The proposed thesis research aims at deepening our understanding of the flow of polymer melts through eccentric plastic pipe extrusion dies. Specifically, the proposed thesis research will explore how viscoelasticity affects ...
  • Knuckle Formation From Melt Elasticity in Plastic Pipe Extrusion 

    Saengow, Chaimongkol; Giacomin, A. Jeffrey; Kolitawong, Chanyut (2016-07)
    When plastic pipe is solidified, it proceeds through a long cooling chamber. Inside the chamber, inside the extrudate, the plastic is molten, and this inner surface solidifies last. Sag then happens inside this cooling ...
  • Complex Polymer Orientation 

    Gilbert, Peter H. (2015-07)
    Previously, we explored the dynamics of a dilute suspension of rigid dumbbells as a model for polymeric liquids in large-amplitude oscillatory shear (LAOS) flow. We derived the expression for the polymer orientation ...
  • Plastic Pipe Solidification: Exact Solutions in Cylindrical Coordinates 

    Saengow, Chaimongkol; Poungthong, P.; Kolitawong, Chanyut; Giacomin, A. Jeffrey (2015-12)
    For polymer melt solidification in plastic pipe extrusion, we perform an energy balance on the pipe extrudate in cylindrical coordinates to arrive at exact solutions for the temperature, and for the solidification rate. ...
  • Transport Phenomena in Eccentric Cylindrical Coordinates 

    Gilbert, Peter H.; Saengow, Chaimongkol; Giacomin, A. Jeffrey (2016-09)
    Studies in transport phenomena have been limited to a select few coordinate systems. Specifically, Cartesian, cylindrical, spherical, Dijksman toroidal, and bipolar cylindrical coordinates have been the primary focus of ...
  • Macromolecular Origins of Fifth Shear-Stress Harmonic in Large-Amplitude Oscillatory Shear Flow 

    Jbara, Layal M.; Gilbert, Peter H.; Giacomin, A. Jeffrey (2016-08)
    This study examines the simplest relevant molecular model of a polymeric liquid in large-amplitude oscillatory shear (LAOS) flow: the suspension of rigid dumbbells in a Newtonian solvent. For such suspensions, the viscoelastic ...
  • Molecular Origins of Higher Harmonics in Large-Amplitude Oscillatory Shear Flow: Shear Stress Response 

    Gilbert, Peter H.; Giacomin, A. Jeffrey (2016-11-01)
    Recent work has focused on deepening our understanding of the molecular origins of the higher harmonics that arise in the shear stress response of polymeric liquids in large-amplitude oscillatory shear flow. For instance, ...
  • Bubble Growth From First Principles 

    Saengow, Chaimongkol; Giacomin, A. Jeffrey; Wu, Xianghong; Kolitawong, Chanyut; Aumnate, Chuanchom; Mix, Adam W. (2016-07-05)
    We consider the simplest relevant problem in the foaming of molten plastics, the growth of a single bubble in a sea of highly viscous Newtonian fluid, and without interference from other bubbles. This simplest problem has ...
  • Polymer Fluid Dynamics: Continuum and Molecular Approaches 

    Bird, R. Byron; Giacomin, A. Jeffrey (2016-06-20)
    To solve problems in polymer fluid dynamics, one needs the equation of continuity, motion, and energy. The last two equations contain the stress tensor and the heat-flux vector for the material. There are two ways to ...
  • Temperature Rise in a Verging Annular Die 

    Younes, Georges R.; Giacomin, A. Jeffrey; Gilbert, Peter H. (2015-12-07)
    Plastic pipes, tubes or catheters are extruded by pressure‑driven flows through annular dies. Whereas die lands are straight, the section connecting the die land to the extruder either converges or diverges, converging ...
  • Reflections on Inflections 

    Saengow, Chaimongkol; Giacomin, A. Jeffrey; Gilbert, Peter H.; Kolitawong, Chanyut (2015-11-11)
    In plastics processing, the single most important rheological property is the steady shear viscosity curve: the logarithm of the steady shear viscosity versus the logarithm of the shear rate. This curve governs the volumetric ...
  • Chain Extended Poly(3—hydroxybutyrate) With Improved Rheological Properties and Thermal Stability, Through Reactive Modification in the Melt State 

    Kolahchi, Ahmad Rezaei; Kontopoulou, Marianna (2015-10-04)
    Branching and crosslinking of polyhydroxybutyrate (PHB) is accomplished for the first time through reactive modification in the melt state, using dicumyl peroxide (DCP) as the free-radical initiator and a tri-functional ...
  • Die Drool and Polymer Degradation 

    Hoy, Geoffrey S.; Giacomin, A. Jeffrey; Gilbert, Peter H. (2015-06-24)
    Die drool is an operational problem associated with polymer extrusion. Extrudate collects outside of the die, necessitating periodic disruptions for cleaning. There exists some debate as to the mechanism that produces ...
  • Extruding Plastic Pipe From Eccentric Dies 

    Saengow, Chaimongkol; Giacomin, A. Jeffrey; Kolitawong, Chanyut (2015-05-25)
    To solidify plastic pipe, the pipe is transported through a long cooling chamber. Inside this chamber, inside the pipe, the plastic remains molten, and this inner surface solidifies last. The flow due to the self-weight ...

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