Rheological studies of polycaprolactone in supercritical CO2

Catherine Kelly; Shona H. Murphy; Gary Leeke; Steven M. Howdle; Kevin M. Shakesheff; Michael Jenkins

doi:10.1016/j.eurpolymj.2012.11.021

Rheological studies of polycaprolactone in supercritical CO2

Catherine Kelly, Shona H. Murphy, Gary Leeke, Steven M. Howdle, Kevin M. Shakesheff, Michael Jenkins

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Abstract

A high pressure parallel plate rheometer is utilised to probe the rheological properties of polycaprolactone (PCL) over a range of temperatures (80 to 120 °C) and CO2 pressures (atmospheric to 100 bar). Interpretation of storage/loss modulus against angular frequency plots show that the reptation time of PCL can be significantly reduced by the addition of 60 bar CO2. This reduction is equivalent to heating the polymer by 20 °C. Application of a time/temperature superposition, coupled with the Arrhenius equation, shows that the addition of CO2 also lowers the activation energy to flow from 31.3 to approximately 21 kJ mol-‐1.

Original language	English
Pages (from-to)	464-470
Number of pages	7
Journal	European Polymer Journal
Volume	49
Issue number	2
Early online date	6 Dec 2012
DOIs	https://doi.org/10.1016/j.eurpolymj.2012.11.021
Publication status	Published - 1 Feb 2013

Keywords

reptation
Rheology
Supercritical CO2
polycaprolactone

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10.1016/j.eurpolymj.2012.11.021

Kelly_et al_Rheological studies of polycaprolactone_European Polymer Journal.2012
NOTICE: this is the author’s version of a work that was accepted for publication in European Polymer Journal . Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in European Polymer Journal , [VOL 49, ISSUE 2, Feb 2013] DOI:10.1016/j.eurpolymj.2012.11.021 Eligibility for repository: Checked 02/06/2015
Accepted author manuscript, 0.99 MBLicence: Creative Commons: Attribution-NonCommercial-NoDerivs (CC BY-NC-ND)

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title = "Rheological studies of polycaprolactone in supercritical CO2",

abstract = "A high pressure parallel plate rheometer is utilised to probe the rheological properties of polycaprolactone (PCL) over a range of temperatures (80 to 120 °C) and CO2 pressures (atmospheric to 100 bar). Interpretation of storage/loss modulus against angular frequency plots show that the reptation time of PCL can be significantly reduced by the addition of 60 bar CO2. This reduction is equivalent to heating the polymer by 20 °C. Application of a time/temperature superposition, coupled with the Arrhenius equation, shows that the addition of CO2 also lowers the activation energy to flow from 31.3 to approximately 21 kJ mol-‐1.",

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AU - Murphy, Shona H.

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AU - Howdle, Steven M.

AU - Shakesheff, Kevin M.

AU - Jenkins, Michael

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AB - A high pressure parallel plate rheometer is utilised to probe the rheological properties of polycaprolactone (PCL) over a range of temperatures (80 to 120 °C) and CO2 pressures (atmospheric to 100 bar). Interpretation of storage/loss modulus against angular frequency plots show that the reptation time of PCL can be significantly reduced by the addition of 60 bar CO2. This reduction is equivalent to heating the polymer by 20 °C. Application of a time/temperature superposition, coupled with the Arrhenius equation, shows that the addition of CO2 also lowers the activation energy to flow from 31.3 to approximately 21 kJ mol-‐1.

KW - reptation

KW - Rheology

KW - Supercritical CO2

KW - polycaprolactone

U2 - 10.1016/j.eurpolymj.2012.11.021

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JO - European Polymer Journal

JF - European Polymer Journal

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ER -

Rheological studies of polycaprolactone in supercritical CO2

Abstract

Keywords

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