Study On The Polymerization And Its Properties Of Modified PAM By Reverse Microemulsion

Novel functional and high-relative molecule weight polyacrylamide was extensivelystudied in present material field. The reverse microemulsion method is considered as oneof the most outlook method in fabricating new nano-materials because of its uniquereacting characteristics, such as mild reaction condition, lower reaction speed, controllableprocess. In this Ph. D. dissertation, reverse microemulsion method was fully used infabricating and modifying polyacrylamide with functional and high-relative moleculeweight. The copolymerization of 2-acrylamide-2-methylpxopanesulfonic acid (shortenedby AMPS), fluorescent monomer 4-methoxy-N-(2-N', N'-dimethylamino ethyl)naphthalimide alkyl chloride quaternary ammonium salt (shortened by FM), fluorescentmonomer 4-(N'-methyl-1-piperazinylallyl)-N-butyl-naphthalimide chloride quaternaryammonium salt (shortened by FC), Cationic monomer dimethylethyl (acryloxyethyl)ammonium bromide (shortened by DMB) and hydrophobical monomer octadecylacrylate(shortened by OA) with acrylamide (AM) and properties of the copolymers werestudied. The interaction between five polymers and Al₂O₃(012) crystal surface have beensimulated by Materials Studio 3.0 program package, binding energies and non-bondinteraction energies and deformation energies have also been acquired. The analysis ofinteraction essence can be applied as theoretic basis for interpreting the mechanism offlocculation and developing more effective flocculation agents.The dissertation was mainly focused on:(1) The reverse microemulsion systems of AOT/isooctane/H₂O, Span80-Tween80/liquidparaffin/H₂O and Span80-TweenS0/isooctane/H₂O were prepared. The solublizationeffect and the regular changes of electrical conductance of the reverse microemulsionsystems at different HLB values were studied by conductivity method. The effects ofadding n-butanol, NaCl and CH₃COONa on the changes of conductivity properties ofthe systems were discussed.(2) The phase behavior, solubilization and electrical conductivity of CTAB-n-butanol/cyclohexane/H₂O, CTAB-n-butanol/heptane/H₂O and CTAB-n-butanol/isooctane/H₂Oheterophase reverse microemulsions were researched.(3) The microstructure, process and mechanism of flocculation of PAM modified withAMPS in suspension medium of 1% kaolin were researched using EM, AFM, lasernanometer measurement and fluorescent spectrophotometer. (4) Fluorescent intensity increased with the concentration of P(FM-AM) and P(FC-AM).The relationship between fluorescent intensity and concentration of P(FM-AM) orP(FC-AM) was linear. The lowest detection limits of P(FM-AM) and P(FC-AM)were 1.83 mg.L^-1 and 0.81mg·L^-1.(5) P(DMB-AM) was an cationic polyelectrolyte, and possessed better flocculation effectsthan that of normal PAM or AMPS modified PAM at the same suspension medium of1% kaolin. Hydrophobically associating water-soluble polymer of P(OA-AM) hadbetter salt-resistance and temperature-resistance.(6) The sequence of binding energies between polymers and AL₂O₃ (012) crystal surfaceby cacualtion was: P(DMB-AM)＞P(OA-AM)＞P(AA-AM)＞P(DMA-AM)＞PAM,which means the sequence of flocculation capability is P(DMB-AM)＞P(OA-AM)＞P(AA-AM)＞P(DMA-AM)＞PAM. The above forecasting results were consistent withthe experiment results.