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Glass transition behavior of emulsion‐polymerized polymer films containing a surface‐active agent
Author(s) -
Tanaka Takao,
Fujimoto Takamitsu,
Shibayama Kyoichi
Publication year - 1979
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.1979.070230417
Subject(s) - glass transition , emulsion polymerization , polystyrene , materials science , polymerization , polymer , emulsion , chemical engineering , methyl methacrylate , polymer chemistry , composite material , engineering
The glass transition behavior of emulsion‐polymerized poly(methyl methacrylate) and polystyrene films containing sodium laurylsulfate as emulsifier was studied by measurements of dynamic mechanical properties and thermal depolarization current. The film specimens of the emulsion‐polymerized polymers were prepared by casting from their benzene solutions. The glass transition temperatures of the emulsion‐polymerized films are higher than those of the bulk‐polymerized films. The higher glass transition temperature of the emulsion‐polymerized films is attributed to the colloidal properties of sodium laurylsulfate in the process of the film formation. The restriction of the molecular chains in the emulsion‐polymerized films is attributed to the interaction between the hydrophobic groups of sodium laurylsulfate and the polymer molecules.