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Wang C.,Qingdao University of Science and Technology | Wang X.,Qingdao University of Science and Technology | Miao C.,Qingdao Hygain Chemical Group Co. | Wu Y.,Qingdao University of Science and Technology
Polymer Engineering and Science

Amphoteric polyacrylamide (AmPAM) was prepared successfully through seeded dispersion polymerization with acrylamide, methacrylatoethyl trimethyl ammonium chloride and acrylic acid as comonomers in ammonium sulfate solution. It was characterized by 1H nuclear magnetic resonance (1H NMR) and elemental analysis. The particle morphology and apparent viscosity of polymer dispersion were obtained by optical microscope and rotary viscometer, respectively. AmPAM dispersion was obtained with low apparent viscosity. The process was smooth without high viscosity stage. The data of 1H NMR spectrum and elemental analysis indicated that all monomers had participated in the polymerization. The seeded reaction time and the mass ratio of two parts of monomers had significant effects on the dispersion polymerization. The best conditions were seeded reaction time 1.75h and the mass ratio 0.75. The apparent viscosity of AmPAM dispersion depended on the number of particles, particle size and low molecular weight polymer concentration in the continuous phase. AmPAM showed both anti-polyelectrolyte effect and polyelectrolyte effect. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers. Source

Jiang Y.-H.,Capital Normal University | Qiu Q.-M.,Capital Normal University | Jiang R.-X.,Qingdao Hygain Chemical Group Co. | Xu H.,Capital Normal University | Jin Q.-H.,Capital Normal University
Acta Crystallographica Section E: Structure Reports Online

In the title compound, [CuI(C8H8N2S) (C18H15P)2]·CH3OH, the coordination environment around the CuI atom is distorted tetrahedral, defined by two P atoms of two triphenylphosphane ligands, one S atom of a 5-methyl-1 H-benzimidazole-2(3H)-thione ligand and one I atom. The complex molecules and the methanol solvent molecules are connected via N - H···O and O - H···I hydrogen bonds, forming a chain along [010]. An intramolecular N - H···I hydrogen bond is also observed. Source

Wang B.,Qingdao University of Science and Technology | Zhang Y.,Qingdao Hygain Chemical Group Co. | Miao C.,Qingdao Hygain Chemical Group Co.
Journal of Ocean University of China

Chitosan derived from crab shells, was used to prepare the graft polymer in aqueous solution with acrylamide (AM) and methacrylatoethyl trimethyl ammonium chloride (DMC) as raw materials and ceric ammonium nitrate (CAN) as initiator. The flocculation ability of the resulting polymer (PCAD) was studied in waste water treatment experiments. Its properties were determined on the basis of the transmittance of waste water after flocculation. The effects of chitosan and DMC content on PCAD's flocculation ability were studied. Flocculation experiments were also undertaken under various pH conditions. According to the experimental data, the flocculation ability could be improved when chitosan content decreased in the raw material, but the monomer conversion would decrease obviously. When the chitosan's content was more than 65%, AM and DMC groups were less on each chitosan molecule. So PCAD's flocculation ability was poor. Similarly, high content of DMC would result in low monomer conversion and high flocculation ability. PCAD molecules with more DMC group had more positive charges. It was favorable to flocculation. However, monomer conversion would decrease with the increase of DMC content. The suitable conditions were that chitosan and DMC contents were 65% and 15-20%, respectively. The experiment data showed that PCAD had good flocculation ability under weak acidic condition. Its ability would be weakened by strong acidic or alkaline condition. The flocculation efficiency was the best at pH of 5.5 when PCAD's dosage was 8mg·L-1. Compared with cationic polymer (the copolymer of AM and DMC, PAD), PCAD showed better flocculation ability under acid and neutral conditions, but worse ability under alkaline condition. © 2011 Science Press, Ocean University of China and Springer-Verlag Berlin Heidelberg. Source

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