Synthesis of macroporous anion exchangers

Abstract EN

By their high chemical resistance, porous styrene-divinylbenzene copolymers (S-DVB) are still the most commonly used as starting copolymers in the synthesis of ion exchangers.

In the present study, the characteristics of the starting S-DVB macro porous copolymers synthesized by suspension polymerization technique in the presence of toluene as progeny and those of the anion exchangers derived there from have been followed.

Fictionalization by chloromethylation reaction of the macro porous S-DVB copolymers was performed with par formaldehyde (CH2O)n / HCl in the presence of Lewis acid as a catalyst (anhydrous AlCl3), in methanol as a reaction medium.

Weak and strong base anion exchangers were obtained by the amination of the chloromethylated S-DVB copolymers with (primary, secondary and tertiary) amines respectively.

The strong base anion exchanger showed an ion exchange capacity in the range (3.6-3.8 mmol / g dry resin), depending on the cross linking degree, the dilution of the starting copolymer, and on the efficiency of chloromethylation.

By their high chemical resistance, porous styrene-divinylbenzene copolymers (S-DVB) are still the most commonly used as starting copolymers in the synthesis of ion exchangers.

In the present study, the characteristics of the starting S-DVB macro porous copolymers synthesized by suspension polymerization technique in the presence of toluene as porogen and those of the anion exchangers derived there from have been followed.

Functionalization by chloromethylation reaction of the macro porous S-DVB copolymers was performed with par formaldehyde (CH2O) n / HCl in the presence of Lewis acid as a catalyst )anhydrous AlCl3), in methanol as a reaction medium.

Weak and strong base anion exchangers were obtained by the amination of the chloromethylated S-DVB copolymers with (primary, secondary and tertiary ) amines respectively.

The strong base anion exchanger showed an ion exchange capacity in the range (3.6-3.8 mmol / g dry resin), depending on the cross linking degree, the dilution of the starting copolymer, and on the efficiency of chloromethylation.