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Preparation of CO 2 /N 2 ‐Triggered Reversibly Coagulatable and Redispersible Polyacrylate Latexes by Emulsion Polymerization Using a Polymeric Surfactant
Author(s) -
Zhang Qi,
Yu Guoqiang,
Wang WenJun,
Li BoGeng,
Zhu Shiping
Publication year - 2012
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201200033
Subject(s) - emulsion polymerization , methyl methacrylate , pulmonary surfactant , methacrylate , polymer chemistry , emulsion , polymerization , materials science , chemical engineering , coagulation , radical polymerization , polymer , chemistry , organic chemistry , composite material , psychology , psychiatry , engineering
We report here a novel approach for making reversibly coagulatable and redispersible polyacrylate latexes by emulsion (co)polymerization of methyl methacrylate (MMA) using a polymeric surfactant, poly(2‐(dimethylamino)ethyl methacrylate) 10 ‐ block ‐poly(methyl methacrylate) 14 . The surfactant was protonated with HCl prior to use. The resulted PMMA latexes were readily coagulated with trace amount of caustic soda. The coagulated latex particles, after washing with deionized water, could be redispersed into fresh water to form stable latexes again by CO 2 bubbling with ultrasonication. The recovered latexes could then be coagulated by N 2 bubbling with gentle heating. These coagulation and redispersion processes were repeatable by the CO 2 /N 2 bubbling.