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Cobalt(III)‐mediated microemulsion polymerization of acrylonitrile: Kinetics and particle morphology
Author(s) -
Sahoo Prafulla K.,
Samal Bijayashree,
Swain Sarat K.
Publication year - 2004
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.13485
Subject(s) - polymerization , polymer chemistry , acrylonitrile , microemulsion , particle size , materials science , monomer , cobalt , emulsion polymerization , suspension polymerization , solution polymerization , chemical engineering , polymer , chemistry , copolymer , pulmonary surfactant , composite material , engineering , metallurgy
The catalytic effect of trans ‐dichloro‐bis(ethylenediamine)cobalt(III) chloride ( trans ‐[Co(en) 2 Cl 2 ]Cl) complex on the microemulsion polymerization of acrylonitrile, in the absence of added emulsifier, was investigated. Polymerization was studied at varying concentrations of initiator, monomer, complex, and solvent over the temperature range of 30–70°C. The overall activation energy ( E a , 39.26 kJ/mol), energy of dissociation of initiator ( E d , 61.62 kJ/mol), number of micelles (0.122 × 10 18 ), and viscosity average molecular weight of the polymer were computed. The distribution of particle sizes was determined by transmission electron microscopy (TEM). It was found that the oil‐in‐water microemulsion polymerization was stabilized by the presence of the Co(III) complex, reducing the particle size into the nano range. The average diameters of PAN nanoparticles, obtained by TEM, were in the range of 50–150 nm at maximum conversion. The experimental particle size was mainly dependent on the concentration of complex and temperature. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3120–3126, 2004