Study On Synthesis, Characterization, And Properties Of Amphiphilic Water-soluble Polymer

Amphiphilic water-soluble polymer exhibited viscosity performance heat resistance, salt resistance and shear resistance stability due to the hydrophobic effect of hydrophobic groups in aqueous solution because of intermolecular and intramolecular association. Making the comparison for the same total hydrophobe chain length, double-chain hydrophobes considerably enhance the thickening efficiency, heat resistance, and salt resistance with respect to single chain hydrophobes. In this article, a series of novel amphiphilic water-soluble polymer and its derivatives involving sulfonate monomer, amphoteric monomer, and twin-tailed hydrophobic monomer are described and their properties of hydrophobic association, heat resistance, salt resistance, and enrichment of chromium ions in aqueous solution were studied by DLS, and TEM measurements. Main research work are divided into the following several aspects:1. Hydrolyzed polyacrylamide(HPAM)-chitosan gel beads were utilized as an adsorbent in removing Cr(Ⅵ) and Cr(Ⅲ) from aqueous media. The high percentage of removal for Cr(Ⅵ)-82.9%and Cr(Ⅲ)-67.6%suggests the great potential for HPAM-chitosan gel beads as an adsorbent for the removal of chromium(Cr) ion from aqueous solution. The kinetic data have been tested in the process of adsorption for Cr(Ⅲ) and Cr(Ⅵ), and proved that it follows the pseudo-second-order rate equation. Both Langmuir equations and Freundlich equations were used for explaining the experimental data of adsorption isotherm, which demonstrated a better fit to the Lagmuir model. Thus it suggests a monolayer adsorption process onto the gel beads. Moreover, Chromium adsorption profile onto HPAM-chitosan gel beads is suggested through the schematic representation.2. Hydrophobically modified polyacrylamides (PAAD) were synthesized by the micellar copolymerization of (AM), sodium2-acrylamide-2-methyl propane sulfonic (AMPSNa) and di-n-butylmethacrylamide (DBMAM). The structure, composition, molecular weight of copolymers were studied by’H-NMR, Elemental analyse(EA), and the static light Scatting(SLS). Then their properties in aqueous solution were studied by DLS and surface tension. The behavior and mechanism of aggregation and degradation for PAAD in aqueous solution were studied, while the experiments for PAAD as an adsorbent for the removal of chromium(Cr) ion from aqueous solution were carried. The results revealed that the adsorption capacity of PAAD on chromium(Cr) ion depended on PADO concentration. At the lower concentration, Cr (Ⅲ) ions coordinated with SO3-ion were adsorbed around the rigid chain of PADD, while PAAD concentration is greater than1.0g/L, the polymer molecular chain curled up because of the association from twin-tailed hydrophobic groups, and the large aggregate precipitate containing Cr (Ⅲ) ions appeared.3. The twin-tailed functional monomers namely di-n-hexylmethacrylamide, di-n-octylmethacrylamide, and N, N-didecyl-N-methyl-N-(4-vinylbenzyl) ammonium chloride were prepared and characterized. A series of novel hydrophobically modified water-soluble copolymers (DDSPAM) containing the above hydrophobic twin-tailed monomers,3-N-(2-methacroyloylethyl)-N,N-dimethylammonio-propane sulfonate (DMAPS), or sodium Vinylsulfonate (SVS) were prepared by an aqueous micellar polymerization. Then their properties in aqueous solution were characterized by DLS, and surface tension. The molecular weights of the copolymers were obtained via static light scattering. The hydrodynamic radius of aggregates was investigated by dynamic light scattering. The cmc and γ cmc values of DDSPAM were measured by fluorescence measurements and identify with that obtained by surface tension measurements. In addition, the results from the viscosity stability of DDSPAM and hydrolyzed polyacrylamide (HPAM) showed that DDSPAM with twin-tailed hydrophobical groups have better performance of salt tolerance and temperature resistance than that of HPAM. The results show that the copolymers exhibited good surface activity, which can increase the viscosity and provided heat resistance and salt resistance because of the introduction of zwitterions and hydrophobic monomer. In addition, the compound systems of copolymers with oil-displacing agent (AP-P4or SNF) can greatly improve the viscosity and thermal stability and it has the high practical application performance in oil recovery. 4. A series of novel amphiphilic block copolymers involving macromolecular initiator (MAI) and di-n-hexylmethacrylamide (DHMAM) were prepared by ATRP. The structure and composition of DDSPAM were characterized by1H-NMR and FT-IR. The aggregation behavior and emulsion properties of these copolymers in solution were studied though DLS and TEM.