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Investigation of the interaction of CO 2 with poly ( L ‐lactide), poly( DL ‐lactide) and poly(ε‐caprolactone) using FTIR spectroscopy
Author(s) -
Nalawade S. P.,
Picchioni F.,
Janssen L. P. B. M.,
Grijpma D. W.,
Feijen J.
Publication year - 2008
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.28443
Subject(s) - lactide , polymer , fourier transform infrared spectroscopy , caprolactone , polymer chemistry , materials science , infrared spectroscopy , intermolecular force , chemical engineering , chemistry , molecule , organic chemistry , composite material , copolymer , engineering
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