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

Fourier transform infrared (FTIR) spectroscopy was used to reveal intermolecular interactions between carbon dioxide (CO₂) 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 CO₂, the wave number...

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Bibliographic Details
Published in:Journal of applied polymer science 2008-09, Vol.109 (5), p.3376-3381
Main Authors: Nalawade, S.P, Picchioni, F, Janssen, L.P.B.M, Grijpma, D.W, Feijen, J
Format: Article
Language:English
Subjects:
Applied sciences
biodegradable polymers
carbon dioxide
Exact sciences and technology
FTIR spectroscopy
melting temperature
Miscellaneous
Organic polymers
Physicochemistry of polymers
processing aid
Properties and characterization
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Summary:Fourier transform infrared (FTIR) spectroscopy was used to reveal intermolecular interactions between carbon dioxide (CO₂) 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 CO₂, the wave number of the absorption maxima of the polymer carbonyl groups shifted to higher values. Also, due to the interaction between CO₂ and the carbonyl groups of the polymers, a new broad peak in the bending mode region of CO₂ appeared. To distinguish between polymer-associated and nonassociated CO₂, and to quantify these contributions, the bending mode peaks were deconvoluted. From these contributions, it was found that in the case of PCL more CO₂ 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.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.28443