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Synthesis of Siloxane Polyether Surfactants and Their Solubility in Supercritical CO 2
Author(s) -
Shi Qingzhao,
Qiao Weihong
Publication year - 2017
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1007/s11743-016-1912-x
Subject(s) - solubility , chemistry , dissolution , polyethylene glycol , molar solubility , siloxane , hildebrand solubility parameter , supercritical fluid , silicone , organic chemistry , polymer
Abstract Four siloxane polyether surfactants were synthesized from allyl bromide, polyethylene glycol methyl ether and heptamethyltrisiloxane (HMTS) to explore their solubility in CO 2 . The dissolving pressures of these surfactants were measured using a high‐pressure view cell at 318–343 K to calculate their solubility in CO 2 . The results show that, the silicone‐containing surfactants exhibit excellent solubility in CO 2 . The shorter the polyethylene glycol group, the better the solubility in CO 2 . Of the five compounds tested, HMTS showed the best solubility in CO 2 which was around 2.4% as a mole percentage. The surfactants show much better solubility than the commonly used surfactants. Moreover, by investigating the effects of the pressure and temperature on the solubility, it was found that an increase in pressure benefits solubility of the compound in CO 2 , while an increase in temperature within the experimental range does the opposite. In addition, a linear correlation in the logarithmic values of the solubility data and the density of CO 2 was found, which means the solubility follows density more directly and not the pressure.