Investigation of the interaction of CO2 with poly (L-lactide), poly(DL-lactide) and poly(ε-caprolactone) using FTIR spectroscopy

✍ Scribed by S. P. Nalawade; F. Picchioni; L. P. B. M. Janssen; D. W. Grijpma; J. Feijen

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 176 KB
• Volume: 109
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.28443

✦ Synopsis

Abstract

Fourier transform infrared (FTIR) spectroscopy was used to reveal intermolecular interactions between carbon dioxide (CO~2~) and the carbonyl groups of poly(L‐lactide) (PLLA), poly(D,L‐lactide) (PDLLA), and poly(ε‐caprolactone) (PCL). After exposing polymer films to high pressure CO~2~, the wave number of the absorption maxima of the polymer carbonyl groups shifted to higher values. Also, due to the interaction between CO~2~ and the carbonyl groups of the polymers, a new broad peak in the bending mode region of CO~2~ appeared. To distinguish between polymer‐associated and nonassociated CO~2~, and to quantify these contributions, the bending mode peaks were deconvoluted. From these contributions, it was found that in the case of PCL more CO~2~ is interacting with the polymer carbonyl groups than in the case of PDLLA and PLLA. Under our experimental conditions, 40°C and pressures up to 8 MPa, a significant depression of the PCL melting temperature was observed. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008