Exploring the Limits of Emulsion Polymerization of Styrene for the Synthesis of Polymer Nanoparticles |
| |
Authors: | Harald Wutzel Wolfgang M Samhaber |
| |
Institution: | (1) Institute of Process Engineering, Johannes Kepler University Linz, Austria |
| |
Abstract: | Summary. Suspensions of polymer nanoparticles in water (latices) with average particle diameters between 20 and 80 nm were synthesized
by batch emulsion polymerization of styrene using sodium dodecyl sulphate (SDS) as surfactant and potassium persulphate (KPS) as initiator. The influence of surfactant concentration, initiator concentration, monomer concentration, and reaction temperature
on the final average particle diameters and size distributions of the latices were studied. The number of particles generated
was proportional to the 0.56 power of the emulsifier concentration and to the 0.37 power of the initiator concentration in
the whole concentration range which was observed. Furthermore, the final number of particles was dependant on the reaction
temperature to the 2.06 power. With these correlations the average particle number as well as the average particle size could
be estimated, and the results were in good agreement (±6%) with the experimental values. A reduction of the monomer/water
ratio from 1:5 to 1:20 yielded smaller particle diameters, while leaving the particle number unaffected. The lower particle
size limits for monomer ratios of 1:10 and 1:15 were estimated with diameters of about 18 and 16 nm. |
| |
Keywords: | , Colloids, Latex, Nanoparticles, Polymerizations, Surfactants, |
本文献已被 SpringerLink 等数据库收录! |
|