关键词: organic-inorganic hybrid compound;emulsion polymerization;nanocomposite

Abstract: A poly (St-co-BA) latex was successfully synthesized by using an organic-inorganic hybrid
compound(OIHC), an aliphatic carboxylate sodium/nano-silica composite, as the emulsifier,
and investigated by particlesize analyzer, transmission electron microscope (TEM), optical
contact angle measurement (OCA) and dynamicmechanical analyzer (DMA). It was found that the
protective agent, sodium polyacrylate (PA),could obviouslyimprove the polymerization
stability and the functional monomer, glycidyl methacrylate (GMA), could enhancethe store
stability of the latex. The particle size of poly(St-co-BA) latex decreased and then
leveled off as OIHCcontent increased. TEM shows that the prepared polymers were actually
organic-inorganic nanocomposites, andthese films have better waterproof property than those
prepared by traditional poly(St-co-BA) latex or organicsilicone modified poly(St-co-BA)
latex. The nanocomposite polymer has much higher glass transition temperaturethan organic
silicone modified poly(St-co-BA) polymer containing the same organic silicone content.

Key words: organic-inorganic hybrid compound, emulsion polymerization, nanocomposite