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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(3) [May 2005] >
| Title: | Synthesis and kinetics of ‘crumpled’ PMMA latex by non-conventionally initiated emulsion polymerization |
| Authors: | Mohapatra, Roomky
Sahoo, Prafulla K |
| Keywords: | Non-conventional emulsion
complex catalyst
kinetics
SEM |
| Issue Date: | May-2005 |
| Publisher: | CSIR |
| IPC Code: | C08F2/32 |
| Abstract: | The aqueous emulsifier-free emulsion
polymerization of methyl methacrylate (MMA) was studied under the catalytic
effect of a prepared complex, [Cu(NH3)4]SO4,
with various initiators like potassium peroxodisulphate (KPS), potassium
monopersulphate (KMPS) and ammonium persulphate (APS). The apparent activation
energies Ea were found to
be 36.52 (KMPS), 40.47 (KPS) and 31.9 kJ/mol (APS). The activation energies of
initiator decomposition Ed were found to be, 31.04, 38.93 and
21.79 kJ/mol for KMPS, KPS and APS, respectively. The emulsion polymer (PMMA)
latex was characterized through the determination of the size and morphology by
scanning electron microscopy (SEM), FTIR spectroscopy, the average molecular
weight by GPC and viscosity methods. The surface of the polymer latex was found
to be somewhat ‘crumpled’. From the kinetic results, the rates of
polymerization, Rp, at 50°C were determined. |
| Page(s): | 341-346 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(3) [May 2005]
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