Study On Properties Of Anionic Polyelectrolyte In Salt Solution

The emphasis of experiment is the relation between anionic polyelectrolyte molecular conformation and salt with different sort and concentration in solution. Determine the change of apparent viscosity of 0.5g/L partial hydrolytic polyacrylamide(Mv=1.7×107,HD=16%) solution with varing concentration of ethylen , diamine dihydrochloride, triethanolamine hydrochloride, 2,3-epoxy prapane trimethyl ammonium chloride under 30℃. The outcoming testify that macromolecule has property of shear thinning. The more quaternary ammonium groups(R1R2R3R4N+),the decreaser of apparent viscosity.In experiment ,it is studied that in Ig/L partial hydrolytic polyacrylamide(Mv=1×107), 2-acrylamido-2-methyipropanesulfonate sodium/acrylamide copolymer(Mv=6×106), poly-2-acrylamido-2-methyipropanesulfonate sodium(Mv=6×106) solution with different concentration of multivalent metal ions ,the change of macromolecular mean-square radius of gyration and Zeta potential as well as flocculation and gel. The result testify that macromolecular mean-square radius of gyration and Zeta potential decrease when the metal ions concentration is increasing.When hydrolytic degree of partial hydrolytic polyacrylamide exceed 70%, flocculation can occure between all metal ions and partial hydrolytic polyacrylamide. When hydrolytic degree of partial hydrolytic polyacrylamide within the range of 20% to 60%, gel can form between Cu2+ and partial hydrolytic polyacrylamide. When hydrolytic degree of partial hydrolytic polyacrylamide within the range of 30% to 60%, gel can form between Zn2+ and partial hydrolytic polyacrylamide. Fe3+ can flocculate partial hydrolytic polyacrylamide in all hydrolytic degree. The effect of all metal ions on 2-acrylamido-2-methyipropanesulfonate sodium/acrylamide copolymer, poly-2-acrylamido-2- methyipropanesulfonate sodium didn't conspicuous. Flocculation and gel can't be formed.Make use of UV and AFS ,the coordination constant(K = 1.29×103) between Cu2+ and partial hydrolytic polyacrylamide(HD=20%) has been calculated under 30℃;the coordination constant(K=0.589)between Zn2+ and partial hydrolytic polyacrylamide(HD=30%) also has been calculated under 30℃.With analying and comparing experimental date, the effect degree of all metal ions on partial hydrolytic polyacrylamide has been ranked: Mg2+< Ca2+< Mn2+< Ba2+