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Detection of melting point depression and crystallization of polycaprolactone (PCL) in scCO 2 by infrared spectroscopy

Polymer Journal, ISSN: 0032-3896, Vol: 45, Issue: 2, Page: 188-192
2013
  • 24
    Citations
  • 0
    Usage
  • 27
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    24
    • Citation Indexes
      24
  • Captures
    27

Article Description

The use of supercritical CO to facilitate the processing of polymers is becoming increasingly popular. In light of this, it is important to understand the effect supercritical CO has on these polymers especially in terms of glass transition temperature and melting point depression and the induction of crystallization. The aim of the current study is to use infrared spectroscopy to probe these properties. Plaques of polycaprolactone were exposed to supercritical CO at a range of temperatures (41-60 °C) and pressures (0-200 bar). Examination of the carbonyl peak at 1720 cm at 41 °C while increasing the pressure shows a change in morphology at 100 bar, indicative of a melting point. This is a 22°C reduction in the melting point compared with atmospheric pressure. Repetition of this experiment over a range of temperatures shows that the pressure required to induce melting reduces as the temperature is increased. Infrared spectroscopy is also used to observe the crystallization of polycaprolactone during the depressurization of CO. © 2013 The Society of Polymer Science, Japan (SPSJ) All rights reserved.

Bibliographic Details

Catherine A. Kelly; Gary A. Leeke; Katherine L. Harrison; Mike J. Jenkins

Springer Science and Business Media LLC

Materials Science

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