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Polymerization of surface‐active monomers. III. Polymer encapsulation of silica gel particles by aqueous polymerization of quaternary salt of dimethylaminoethyl methacrylate with lauryl bromide
Author(s) -
Nagai Katsutoshi,
Ohishi Yoshiyuki,
Ishiyama Kadzuo,
Kuramoto Noriyuki
Publication year - 1989
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1989.070381203
Subject(s) - cationic polymerization , polymerization , monomer , polymer , polymer chemistry , materials science , methacrylate , aqueous solution , radical polymerization , bromide , chemical engineering , precipitation polymerization , chemistry , organic chemistry , composite material , engineering
Polymer encapsulation of silica gel particles (SiO 2 ) by aqueous, radical polymerization of a cationic, surface‐active monomer, quaternary salt of dimethylaminoethyl methacrylate with lauryl bromide, in the presence of the solid was investigated. The polymerization gave the polymer encapsulating the solid particles (“C‐polymer”), though accompanied by the formation of that suspended in form of latex (“L‐polymer”). The proportion of C‐polymer in the products increased with increasing the amount of SiO 2 at a constant monomer concentration and only C‐polymer was formed under the conditions where the feed ratio of monomer to SiO 2 is about 0.13 or lower by weight. Increasing the monomer concentration in feed increased slightly the ratio of C‐polymer to SiO 2 . The results obtained here suggest that C‐polymer is mainly formed through the polymerization of monomer adsorbed on the solid surface. An electron micrograph of the polymer‐encapsulated SiO 2 revealed that the solid particles are uniformly encapsulated with the resulting polymer.