| dc.description.abstract | Microcapsulation of lubricating oil for electrolytic co-deposition has been
developed by suspension polymerization. Monomers, cross-linking agent,
lubricating oil, and initiator were mixed and then added to the water phase
including stabilizer, PVA. After that, the solution was homogenized and
proceeded to suspension polymerization at 70oC. Methyl methacrylate (MMA)
and styrene (St) were used as the monomers. Ethylene Glycol Dimethacrylate
(EGDMA) was used as cross-linking agent. Azobisisobutyronitrile (AIBN) was
used as initiator.
In this study, different parameters, the concentrations of stabilizer, initiator,
cross-linking agent, and lubricating oil, homogenized speed, reaction time, and
addition of lubricating oil were discussed. Thermo gravimetric Analysis (TGA),
Scanning Electron Microscope (SEM) Fourier-Transform Infrared Spectrometer
(FTIR), Dynamic light scattering (DLS) were used to determine the
characterization of the microcapsules.
The results showed that the morphology of microcapsules could be
improved by adding 0.1wt% of stabilizer. The weight fraction of St in monomers
more than or equal to 50% was more suitable to be the shell materials. As the
amount of initiator and cross-linking agent increased, the total conversion and
polymer yield would increase. When reaction time was 6 or 8 hours, there are
better lubricating oil content and yield.
The best results of microcapsules showed that the lubricating oil content is
63.4%, the range of particle size is from 150 to 350nm, and the total conversion is 71.2%.
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