To achieve a high efficient of petroleum recovery, the fabrication of high-performance profile control agents has attracted extensive attention because of their scientific significance and urgent requirement in industrial application. The copolymer consisting of Acrylamide (AM) and 2-Ethylhexyl acrylate is thought to be one kind of ideal profile control agent, which has the advantages of high efficiency and low cost. Although AM/2-EHA copolymer profile control agent has made some progress, monomer reactivity ratios for AM and 2-EHA has not been well understood, which seriously inhibit the industrial applications of AM/2-EHA copolymer. Herein, we studied the monomer reactivity ratios of AM/2-EHA by FT-IR by carrying out a serial of controllable experiments. The free radical copolymerization of acrylamide (AM) and 2-Ethylhexyl acrylate (2-EHA) is stimulated by an initiator of benzoyl peroxide (BPO) in a solvent of mixed alcohol and cyclohexane in a molar ratio of 1:1. The FT-IR absorption peaks of C-N and C-O-C were set as the characteristic peaks of AM and 2-EHA, respectively. The relation curve between peak area ratio of both characteristic peaks and the molar ratio of two monomers was obtained on the basis of standard samples. The molar ratio of two monomers in the copolymer was obtained according to the relation curve and the peak area ratio in the copolymer. The monomer reactivity ratios of AM and 2-EHA were calculated by using Fineman-Ross and Kelen-Tudos graphical methods and Yezrielev-Brokhina-Roskin calculative method. The monomer reactivity ratios of AM and 2-EHA were calculated at different temperatures. Based on the results, the mechanism of temperature on the monomer reactivity ratios was proposed.

Monomer reactivity ratios of acrylamide and 2-ethylhexyl acrylate in free radical copolymerization

247th National Meeting (2014)

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