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Preparation of nanometer-sized poly(methacrylic acid) particles in water-in-oil microemulsions

Authors :
Douglas J. Hourston
Xujin Bao
Qiuyu Zhang
Mian Lin
Source :
Journal of Applied Polymer Science. 100:2497-2503
Publication Year :
2006
Publisher :
Wiley, 2006.

Abstract

A water-in-oil microemulsion, water-in-cyclohexane stabilized by poly(ethylene glycol) tert-octylphenyl, was developed to prepare poly(methacrylic acid) (PMAA) particles. Up to 100% conversion of the amphiphilic monomer, methacrylic acid (MAA), which could not be converted to the polymer efficiently in a dioctylsulfosuccinate sodium salt/toluene microemulsion, was achieved. The viscosity-average molecular weight of the PMAA prepared was 1.45 105 g/mol. The effects of some polymerization parameters, including the reaction temperature and the concentrations of the initiator and the monomer, on the polymerization of MAA were investigated. The results showed that the polymerization rate of MAA was slower than that of acrylamide in the microemulsions reported in the literature. The degree of conversion increased with the initiator concentration, reaction temperature, and monomer concentration. However, the stable microemulsions became turbid during the polymerization when the reaction temperature was at 70°C or at a high monomer concentration (40 wt %) The synthesized PMAA particles were spherical and had diameters in the range of 50 nm.

Details

ISSN :
10974628 and 00218995
Volume :
100
Database :
OpenAIRE
Journal :
Journal of Applied Polymer Science
Accession number :
edsair.doi...........524d4d7485a9503e4a2b1648dcfe320b
Full Text :
https://doi.org/10.1002/app.23619