Polymers with pendent functional groups. VI. A comparative study on the chloromethylation of linear polystyrene and polysulfone with paraformaldehyde/Me3SiCl

Studies have been carried out on the chloromethylation reaction of polystyr ene and polysulfone for obtaining soluble chloromethylated polymers with a high degree: of substitution. The mixture of paraformaldehyde/chlorotrimetf iylsilane as the chloromethylation agent, stannic tetrachloride as the cata lyst, and chloroform as the solvent was used for the chloromethylation reac tion of these polymers. The degree of substitution and the chlorine content depend on the [SnCl4]/[polymer structural unit], [Me3SiCl]/ [polymer struc tural unit] molar ratios and the reaction time.