Synthesis and Performance of Partially Branched and Partially Crosslinked Polyacrylamides

doi:10.11885/j.issn.1674-5086.2017.01.13.02

Abstract

Abstract: Mechanical degradation during polymer flooding causes the viscosity of the polymers to decrease, thus affecting the ultimate recovery rate. To improve the working viscosity and shear stability of the polymers, we rationally designed molecular structures by introducing dimethylaminoethyl methacrylate (DMAEMA) as a functional monomer into these molecular structures. A series of partially branched and partially crosslinked polyacrylamides were prepared via conventional free radical polymerization in aqueous solution, using ammonium persulfate and DMAEMA as the initiating system. In particular, the secondary carbons adjacent to the nitrogen of DMAEMA can act as active points to induce the formation of side chains through free radical polymerization. The terminal free radicals of these chains then terminate through coupling to form crosslinked structures. Infrared spectroscopy was used to study the structure of the partially branched and partially crosslinked polyacrylamides, and the effects of different initiator ratios on the performance of the polymers were investigated by examining the polymer properties. The results indicated that the use of DMAEMA as a reducing agent in the polymerization causes partial crosslinking within the polymer structure, and consequently, the viscosity and shear stability of the polymers increase with the DMAEMA content. However, as DMAEMA also acts as a chain transfer agent, the molecular weight of the polymerization products decreases when excessive quantities of DMAEMA are used, which in turn decreases the shear stability.

Key words: polyacrylamide, partial crosslinking, viscosity-average molecular weight, solution viscosity, shear stability

CLC Number:

ZHU Yangwen. Synthesis and Performance of Partially Branched and Partially Crosslinked Polyacrylamides[J]. 西南石油大学学报(自然科学版), 2017, 39(2): 179-184.

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