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- W2333221981 abstract "Abstract CO 2 + polymer phase behavior is of interest in a number of applications, including the precipitation of polymer particles for drug delivery and the deposition of fluoropolymer films. There is experimental evidence to suggest that CO 2 forms weak complexes with carbonyl groups in these polymers, and it has also been suggested that specific interactions between CO 2 and the lone pair of electrons on fluorine in a C–F bond contribute to the high solubility of CO 2 in these fluropolymers. In the present work, therefore, we have quantified the strength of weak complexes in CO 2 + poly(lactide- co -glycolide) (PLGA) systems using in situ FTIR spectroscopy; and calculated cloud points in these systems using the measured FTIR spectra combined with a modified lattice model. We demonstrate that this model is able to predict the phase behavior of CO 2 + PLGA copolymer systems using only one parameter obtained from a reference system (CO 2 + low molecular weight PLA in our case). Finally, we have extended the model to the calculation of phase behavior in CO 2 + poly(fluroalkyl acrylate) systems, and show that the results may be used to infer the existence of weak CO 2 –C–F complexes in these systems." @default.
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- W2333221981 date "2007-12-01" @default.
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- W2333221981 title "Phase behavior of CO2+biopolymer and CO2+fluoropolymer systems" @default.
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- W2333221981 doi "https://doi.org/10.1016/j.fluid.2007.07.031" @default.
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