Influence of reaction time and carbon disulfide amount on sulfophosphorylation reaction of phosphorylated resins

In this work, we studied the sulfophosphorylation reaction of phosphorylated resins by varying the reaction time and CS2 amount and characterized these materials thoroughly by thermogravimetry (TG) and infrared spectroscopy (FTIR). The thermal stability and the FTIR spectra of the Sty-DVB copolymers were significantly changed after the phosphorylation and sulfophosphorylation reactions. The unmodified copolymers presented one degradation stage while the sulfophosphorylated copolymers showed two degradation stages, due to the presence of phosphorous and sulfur in the polymeric matrix. There was a tendency for increasing content of sulfophosphoryl groups incorporated into the Sty-DVB copolymers with increasing CS2 amount and reaction time. However, for high CS2 amounts, a long reaction time was not necessary to transform the phosphoryl groups into sulfophosphoryl groups. The best conversion degree of phosphoryl into sulfophosphoryl groups was obtained by using reaction time of 144 h and 0.25 mol of CS2.