Abstract:By using vinyl acetate (VAc) as monomer and divinyl benzene (DVB) as crosslinking agent, cross-linked poly (vinyl acetate) microspheres with different sizes (0.1~0.5 mm) were prepared via suspension polymerization. After alcoholysis, cross-linked poly (vinyl alcohol) microspheres can be obtained. We focused on the effect of rotational speed on the average size and size distribution of microspheres. The experimental results show a trend that, as the stirring speed increasing, the average size of microspheres decreases and the uniformity of final size distribution increases obviously, the results can be explained by decrease of the coalescence between droplets under a higher stirring speed. On this basis, to obtain high surface area microspheres, appropriated porogens were added in the polymerization process, with the largest up to 494.1 m22/g, the effect of porogen type and divinylbenzene (DVB) content on specific surface area was investigated in order to obtain microspheres with large specific surface areas. The results indicate that the specific surface area increases significantly while the DVB content is increased or a porogen with solubility parameter similar to copolymer is added.