| Large size, mono-disperse, different patterns and surfaces functional polymermicro-spheres are widely used as a frame general polymer materials in catalyzer, polymersorbents, bio-medicine, information and micro-electronics due to its large specific surfacearea, strong adsorption, high gathering and high reaction efficiency. And many attentionsfrom the world have been paid on this area. The most important things among these propertiesof polymer particles are the size and size distribution. It is valuable to have a good control ofparticle's size and its distribution.The polystyrene micro-spheres with average diameter of 1.53μm, 1.80μm, 2.16μm,4.65μm were successfully prepared through dispersion polymerization method with styrene asthe monomer, AIBN as the initiator, PVP as the stabilizer, and ethanol/water as the dispersionmedium. And the micro-spheres were also examined by SEM, PSA and DSC. The resultsindicated that these seeds exhibited excellent mono-disperse property.After the addition of the cross-linking agent (DVB) and free-oxygen absorber (AscorbicAcid) in the dispersion polymerization system, the average diameter of 4.30μmmicro-spheres were synthesized successfully. The results indicated that the resultantmicro-spheres possessed good mono-disperse property and solvent resistance after measuredby SEM, PSA and DSC and soluble experiments.The average diameters of 7.10μm cross-linking polystyrene micro-spheres weresuccessfully prepared by the seed swelling polymerization method with the seeds thatprepared in the first step (1.80μm in diam). The resultant particles were also detected by SEM,PSA and DSC, and the results indicated that these micro-spheres also kept goodmono-disperse property with large diameter and excellent particle sphericity.
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