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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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 languageEnglish
Pages (from-to)464-470
Number of pages7
JournalEuropean Polymer Journal
Issue number2
Early online date6 Dec 2012
Publication statusPublished - 1 Feb 2013


  • reptation
  • Rheology
  • Supercritical CO2
  • polycaprolactone


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