The Synthesis And Property Of Polymer Consisting Dithiocarbamic Acid Groups

It was known that dithiocarbamate groups were effectived as an excellect chelated agent for the separation and concentration trace amount of noble metal and heavy metal ions, while unacceptable for alkali metal and alkaline-earth metal ions, quantificationally recover and enrichment metal ions from seawater or other dilute solution. By coordinating with specific metal ions the active functional groups wound produce many new performances in physical chemistry, such as photosensitive activity, lubricate, initiation and dissolve aids performances.Monomers containing active functional groups were prepared from polyamine and achieved a series of polymers with dithiocarbamate by homopolymerization, copolymerization or polycondensation methods. The active groups were introduced savageness or synthesize macromolecul by graft macromoleculize methods and also prepared polymers containing sesbanion gum carrier, then the groups were modified to graphite electrode and attained a kind of polymer film chemistry modifying electrode.Some polydithiocarbamate resins were reviewed separately in suituable synthesize appropriate capability, especially their adsorption properity, and more investigate all kinds of conditions such as pH value, adsorption time and adsorption temperature effected absorption capability, absorption rate and absorption dynamics parameters.Polydithiocarbamate backbone polymer beared high decomposetemperature, and cyclic amine was higher than linear ones; Benzyl sulfide polydithiocarbamates could availably introduce block copolymerization of MMA under ultraviolet radiation.Polydithiocarbamate resins containing piperazine backbone exhibited high adsorption capacity over the range of broad pH value for metal ions, as Ag+, Pd2+, Cu2+, Ni2+, Pb2+, their adsorption capacity separately were 6.50,3.81, 2.90,2.21and 1.04mmol/g. Disposal experiments for mixture solution containing Ag+, Cu2+, Ni2+and Pb2+, indicated that the polymers had higher selectivity for noble metal ions.Crosslinked sesbanion gum polymers were prepared by epichlorohydrin and introduced dithiocarbamate by alkalization, epoxidation, amination, thioformation to secondary amine groups. The optimum conditions for epoxidation process were also obtained. Alkali concentration was 11%, and the dosage of epichlorohydrin was 1.0mL according to 1.0g basify stock. The amination temperature was 800C. The resins possessed high capacities, rapid rate and preferably repetition for capturing noble metal ions. Polymer crosslinked by organic silane coupling agents exhibited high selectivity and adsorption capacity for metal ions attained 5.41mmol/g to Ag+ and 2.10 mmol/g to Cu2+. Graphite electrode modified with dithiocarbamate active functional groups had been fabricated and applied to the analysis of siliver ion in the aqueous media. The optimum reaction conditions were KCl solution (1.0mol/L), pH value (1.7), enrichment time (15min), scan velocity (100mV/s) and peak current value was 10 times of unmodified electrode. Thisindicated that active functional groups after chemistry modified had excellect chelation for Ag+ and advanced adsorption sensitivity and selectivity for metal ions greatly.