Synthesis and properties of hydrophobically associating cationic polyacrylamide
ZHAO Xi-yang, SHEN Yi-ding, MA Guo-yan
Key Laboratory of Auxiliary Chemistry & Technology for Light Chemical Industry of the Ministry of Education, Shaanxi University of Science & Technology, Xi'an 710021, China
Abstract: HAM-D,an emulsion type hydrophobically associating cationic polyacrylamide,is synthesized through inverse emulsion polymerization method by using a functional hydrophobic long-chain octadecyl dimethyl allyl ammonium chloride (HM18),acrylamide (AM) and 2-methyl-acryloyloxyethyl-trimethylammonium chloride (DMC) as raw materials.The optimum synthetic conditions are determined that w(initiator)=0.04% (based on the total mass of monomers),w(monomers)=24%,reaction temperature is at 35℃ and reaction time lasts for 6 h.The structure and properties of the prepared HAM-D are characterized by means of FT-IR,laser particle size analyzer,thermo gravimetric analyzer (TGA) and dynamic rheometer.The results show that HAM-D has narrow distribution of emulsion particle size and good emulsion stability.Compared with common polyacrylamide,HAM-D has good heat resistance.The apparent viscosity of HAM-D aqueous solution will increase gradually as the mass concentration of HAM-D increases.The apparent viscosity of HAM-D solution can reach 163 mPa·s in 5×104 mg·L-1 mineralized water,reflecting that HAM-D has good thickening and salt resistance performances.After shearing 300 s,the apparent viscosity decreases from 249 mPa·s to 236 mPa·s,showing an excellent shear resistance.
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