Study of gradient copolymers auto-association in supercritical CO sub(2) thanks to synchrotron and in-house small-angle X-rays scattering measurements

Specific comblike gradient copolymers made of metal-complexing CO sub(2)-phobic units and fluorinated CO sub(2)-philic units were designed to study their auto-association when solubilised in supercritical CO sub(2) (scCO sub(2)). This paper shows that in-house SAXS measurements on scCO sub(2) system...

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Bibliographic Details
Published in:The Journal of supercritical fluids 2016-08, Vol.114, p.26-31
Main Authors: Gasca, F, Corsob, B, Causseb, J, Lacroix-Desmazesa, P
Format: Article
Language:English
Subjects:
Agglomeration
Beryllium
Carbon dioxide
Copolymers
Design engineering
Small angle X ray scattering
Synchrotrons
X-rays
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Summary:Specific comblike gradient copolymers made of metal-complexing CO sub(2)-phobic units and fluorinated CO sub(2)-philic units were designed to study their auto-association when solubilised in supercritical CO sub(2) (scCO sub(2)). This paper shows that in-house SAXS measurements on scCO sub(2) systems are now possible thanks to both high-energy X-rays and specific high-pressure cell designed with beryllium windows. The copolymer system poly(1,1,2,2-tetrahydroperfluorodecylacrylate-co-4-(diphenylphosph i no)styrene), poly(FDA-co-DPPS) was compared to homopolymer poly(FDA)-SH and more classical molecule, C sub(8)F sub(17)C sub(2)H sub(4)-SH (RfSH). The results show that the presence of the CO sub(2)-phobic part of the copolymer does not necessarily tend to favour auto-association due to the comblike gradient design. However, this CO sub(2)-phobicity favours inter-object correlation leading to aggregation.
ISSN:0896-8446
DOI:10.1016/j.supflu.2016.04.002