{A comparison between gravimetric and in situ spectroscopic methods to measure the sorption of CO{\textless}inf{\textgreater}2{\textless}/inf{\textgreater} in a biocompatible polymer}

Citation:
Duarte AR, Anderson LE, Duarte CM, Kazarian SG. {A comparison between gravimetric and in situ spectroscopic methods to measure the sorption of CO{\textless}inf{\textgreater}2{\textless}/inf{\textgreater} in a biocompatible polymer}. Journal of Supercritical Fluids. 2005;36. copy at https://docentes.fct.unl.pt/ard08968/publications/comparison-between-gravimetric-and-situ-spectroscopic-methods-measure-sorption

Abstract:

In situ ATR-IR spectroscopy was used to simultaneously measure the sorption and swelling of carbon dioxide at high pressures in a biocompatible acrylate copolymer poly(methylmethacrylate-co-ethylhexylacrylate-co- ethyleneglycoldimethacrylate), P(MMA-EHA-EGDMA). The $ν$ 3 band of CO 2 dissolved in the polymer (at 2335 cm -1 ) was used to calculate the sorption data and the polymer swelling was determined by analyzing the changes in the absorbance of the $ν$(CO) band (at 1730 cm -1 ) of the polymer. Transmission spectroscopy in the near-IR region was also used to study the sorption of CO 2 in the polymer using combinational and overtone bands. The experiments were carried out in a pressure range of 2.0-12.0 MPa and in a temperature range of 27-40 °C. The data for CO 2 sorption in this polymer obtained by in situ spectroscopic methods have been compared to the data obtained by the gravimetric technique. © 2005 Elsevier B.V. All rights reserved.

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