Synthesis And Application Of Novel Water-soluble Sulfonated Polytriazines

In this study, a kind of novel sulfonated polytriazine (SP) water-soluble polymers were designed and synthesized. The applications as flocculant for cationic dyes and dispersant for SWNTs were studied.2,4,-Dichloro-6-(2,5-disulfophenylamino)-1,3,5-triazine (compound I) was synthesized by the condensation polymerization reaction of cyanuric chloride and2-amino-benzene-1,4-disulphonic acid. The experimental results demonstrated that pH5-6,:action temperature0-5℃, n(cyanuric chloride):n(aniline-2,5-disulfonic acid)=1.05:1, the concentration of2-amino-benzene-1,4-disulphonic acid=10.7%, the amounts of potassium acetate=26.5%of the total weight were the optimal reaction conditions. The yield of the product reached93.6%under such conditions. The structure of the product was confirmed by LC-MS, FT-IR and’H-NMR. Then a novel sulfonated polytriazine (SP) was synthesized by the condensation polymerization reaction of2,4,-dichloro-6-(2,5-disulfophenylamino)-1,3,5-triazine and1,4-diaminobenzene with91.7%yield. The effect of the reaction time on the molecular weight of the polymer was examined. The results showed that the molecular weight was closely related with the reaction time. With longer time, the molecular weight increased. However, this trend was not obvious after a certain time. The structure of the product was confirmed by FT-IR and1H-NMR. The thermal stability was tested by TG.2,4-Dichloro-6-(4-sulfoanilino)-1,3,5-triazine (compound Ⅱ) and2,4-dichloro-6-(1,3,6-trisulfonaphthyl amino)-1,3,5-triazine (compound III) were also synthesized in this study. Under the optimal conditions, the yields were95.7%and85.4%, respectively. The structures were confirmed by LC-MS, FT-IR and1H-NMR. Then sulfonated polytriazine (SP) II and sulfonated polytriazine (SP) III were prepared by the condensation polymerization reaction between them and1,4-diaminobenzene, with91.0%and92.1%yields, respectively. The structures of the two products were confirmed by FT-IR and1H-NMR. And their thermal stability was tested by TG.The flocculation performances of the sulfonated polytriazines (SP) I with higher molecular weights for the cationic dyes were evaluated. The rate of color removal from Basic blue9, Basic red18and Basic yellow13reached as high as98.5%,99.6%and90.1%, respectively. The adsorption capacities for Basic blue9, Basic red18and Basic yellow14were1719,1988and1983mg/g, respectively. Moreover, the salt resistance made this flocculant more practical. The flocculation performances of the sulfonated polytriazines (SP) II and sulfonated polytriazines (SP) Ⅲ for the cationic dyes were also evaluated under the optimal conditions. The rates of color removal from Basic blue9, Basic red18and Basic yellow13were83.1%,89.1%and72.5%, respectively for SP II, and99.1%,97.5%and85.3%, respectively for SP III.The dispersion performances of the sulfonated polytriazines (SP) I with lower molecular weights for SWNTs were evaluated. The optimized condition was:pH=7, c(SWNTs):c (dispersant)=1:3, c(SWNTs)=2mg/mL, ultrasonicated for30min at300W, centrifuged at10000rpm for15min. Under this optimal condition, the dispersion capacity of the SP I for SWNTs was1.85mg/mL. This value reached2.35mg/mL when c(SWNTs) was increased to3mg/mL.