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Rheological behaviors and structure of hydrophobically associating AM–SMA copolymers synthesized by microemulsion polymerization

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Abstract

A series of hydrophobically associating copolymers of acrylamide and hydrophobic stearyl methacrylate as comonomers were prepared by microemulsion polymerization. The rheological properties of the copolymers in aqueous solution depended on the content of hydrophobic monomer, initiator amount, surfactant concentration, the copolymer concentration and the addition of salt. The hydrophobically associating copolymers showed good temperature, shear, and salt resistance with the critical aggregation concentration around 0.6 g dL−1. In addition, the apparent viscosities of hydrophobically associating copolymer solutions are increased remarkably by the addition of a small amount of NaCl and CaCl2, respectively. FTIR and 1H-NMR spectra indicate the structure of hydrophobically associating copolymers. The shear-thinning behavior of hydrophobically associating copolymer makes it useful in enhanced oil recovery and drilling fluids.

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Acknowledgments

This work was financially supported by Opening fund of State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, China (PLN1114) and the Sichuan youth science and technology innovation research team funding scheme (2013TD0005), China.

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Authors and Affiliations

  1. State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan, 610500, China

    Tao Wan

  2. Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu, Sichuan, 610059, China

    Tao Wan, Ruixiang Li, Ziweng Hu, Min Xu, Wenzhong Cheng & Chuzhang Zou

  3. PetroChina Sichuan Petrochemical Co., Ltd, Chengdu, Sichuan, 611930, China

    Daqing Wu

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  1. Tao Wan
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  2. Ruixiang Li
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  3. Daqing Wu
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  4. Ziweng Hu
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  5. Min Xu
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  6. Wenzhong Cheng
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  7. Chuzhang Zou
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Correspondence to Tao Wan or Ziweng Hu.

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Wan, T., Li, R., Wu, D. et al. Rheological behaviors and structure of hydrophobically associating AM–SMA copolymers synthesized by microemulsion polymerization. Polym. Bull. 71, 2819–2831 (2014). https://doi.org/10.1007/s00289-014-1224-0

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  • DOI: https://doi.org/10.1007/s00289-014-1224-0

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