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Adding sodium p-styrenesulfonate(2695-37-6) to prepare a carboxyl group

Preparation of carboxylated polystyrene microspheres by soap-free emulsion copolymerization. The soap-free emulsion copolymerization of styrene and carboxylic acid comonomer was carried out by adding sodium p-styrenesulfonate(2695-37-6) to a mixture of water and methanol as a dispersion medium to prepare a carboxyl group. The polystyrene microspheres are bonded to the surface of the resulting microspheres with a large amount of -COOH groups, which have a high negative charge and are monodisperse. They were characterized by TEM, SEM, FT-IR, DLS and solid-state nuclear magnetic resonance (NMR). Some factors affecting the copolymerization, such as the concentration of styrene and sodium p-styrene sulfonate, the divinylbenzene /styrene mass ratio and the solvent composition, were analyzed in detail. The carboxylic acids mentioned herein include p-vinylbenzoic acid(VBA), acrylic acid(AA), methacrylic acid(MAA) and itaconic acid(IA).



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