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Preparation of core-shell polystyrene-polyimide particles by dispersion polymerization of styrene using poly(amic acid) as a stabilizer
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2000
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Materials ScienceChemical EngineeringCore-shell Polystyrene-polyimide ParticlesEngineeringPolymer TechnologyPolymer SolutionHigh Paa ContentPolymer MaterialPolymer SciencePolymer BlendPolymer EngineeringDispersion PolymerizationChemistryAromatic PolyPolymerization KineticsAmic AcidPolymer ChemistryPolymer Synthesis
Dispersion polymerization of styrene (S) and vinylbenzyltrimethylammonium chloride (VBA) was conducted in an ethanol-water medium using an aromatic poly(amic acid) (PAA) as the stabilizer. When equimolar amounts of VBA and the carboxylic acid of PAA were used, monodisperse particles with high PAA content were obtained quantitatively. The imidization of PAA on the particles proceeded with acetic anhydride and N,N-dimethylaminopyridine to form core-shell PS-polyimide particles.