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Preparation and characterization of polyacrylamide in cationic microemulsion
Author(s) -
Yan Feng,
Zheng Changren,
Zhai Xiaodong,
Zhao Dejun
Publication year - 1998
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/(sici)1097-4628(19980124)67:4<747::aid-app17>3.0.co;2-o
Subject(s) - cationic polymerization , microemulsion , polyacrylamide , potassium persulfate , polymerization , emulsion polymerization , polymer chemistry , precipitation polymerization , radical polymerization , monomer , chemistry , solution polymerization , chemical engineering , materials science , polymer , organic chemistry , pulmonary surfactant , engineering , biochemistry
The polymerization of acrylamide in a water/oil cationic microemulsion initiated with a water‐soluble radical initiator, potassium persulfate (KPS), was investigated. The kinetics of microemulsion polymerization clearly shows a two‐stage process; when the initiator is dissolved in a monomer solution before the emulsification, the reaction rate is higher than it would be if added after the emulsification. The activation energy of the polymerization is affected by the cosurfactant. Information about the microstructures of polyacrylamides is derived from X‐ray diffraction, DSC, FTIR, and laser‐Raman studies. The results of the studies suggest that the orientation behavior of microemulsion polymerization increases the crystallinity of polyacrylamide and the polar group (—NH 2 ) is coiled in the inner part of the polymer particles compared to solution and water/oil emulsion polymerizations. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67: 747–754, 1998