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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 StyDVB 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. keywords: Sulfophosphorylation, Sty-DVB, FTIR. AS&T Volume 6, Number 1, Jun 2018 Association of sulfur and phosphorous atoms in sulfophosphoryl groups confers biocidal properties to these innovative materials 3. The phosphorylation reaction of styrene-divinylbenzene (Sty-DVB) copolymers has been studied in our previous work and the synthesized materials have been characterized 5. In another our previous work has been reported the introduction of sulfophosphoryl groups into Sty-DVB copolymers 3. Reaction of phosphoryl groups with CS2 in order to introduce sulfophosphoryl groups into Sty-DVB copolymers was difficult to achieve, with low conversion degree 3. This reaction was based on reaction of conversion of amino acid into dithiocarbamate groups 6, although they are different reactions. The sulfophosphorylated copolymers presented excellent biocidal activity, but the reaction proved to be extremely slow. In addition, the literature does not report the detailed study of the conversion reaction of phosphoryl into sulfophosphoryl groups and the broad characterization of the synthesized materials. The reaction time and the amount of carbon disulfide used in the sulfophosphorylation reaction are important reaction parameters. These parameters influence the sulfophosphorylation degree. Apart from being a chemical modification reaction in heterogenous phase, not described in the literature, since the reaction occurs in a crosslinked polymeric structure, therefore insoluble, the study has unpublished results regarding sulfophosphorylation reaction by varying and optimizing these parameters, which makes the work be inovative and relevant. Thus, the aim of this work was study widely the influence of these parameters in the sulfophosphorylation reaction and determine the optimum parameters for this reaction.

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