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Polymerization of a water‐swellable microgel by a novel inverse microemulsion polymerization and its application as a viscosity thickener for cosmetics
Author(s) -
Kaneda I.,
Sogabe A.,
Nakajima H.
Publication year - 2006
Publication title -
international journal of cosmetic science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 62
eISSN - 1468-2494
pISSN - 0142-5463
DOI - 10.1111/j.1467-2494.2006.00310_3.x
Subject(s) - microemulsion , polymerization , viscosity , chemical engineering , rheology , pulmonary surfactant , acrylamide , micelle , aqueous solution , thickening agent , polymer chemistry , chemistry , materials science , cationic polymerization , copolymer , organic chemistry , polymer , thickening , composite material , polymer science , engineering
A water‐swellable microgel was polymerized in the inverse micelle of a nonionic surfactant, namely a confined space. The microgel was polymerized using 2‐acrylamido‐2‐methylpropanesulfonic acid, dimethyl‐acrylamide, and methylene‐bis‐acrylamide. To determine a suitable polymerization system that appeared W/O microemulsion at around 65 degrees, the phase diagram of the pseudo‐ternary system was studied. The microgel polymerized in the system was isolated by a reprecipitating method; consequently the samples were obtained as powder. The rheological properties of the microgel were studied after re‐dispersing the powder sample in an aqueous medium. The viscosity‐thickening effect of the crosslinked microgel was higher than that of the non‐crosslinked sample. Moreover, a suitable crosslinking ratio was confirmed. The viscosity thickening effects of the microgel under various pH, salt concentration, and alcohol concentration conditions were also investigated. The study revealed that the microgel can be considered as a multi‐purpose viscosity thickener for cosmetics.