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1H NMR study on microstructure of a novel acrylamide/methacrylic acid template copolymer in aqueous solution

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Abstract

A novel acrylamide/methacrylic acid template copolymer was prepared using polyallylammonium chloride (PAAC) as a template. This copolymer contains acrylamide (PAM), phenoxy acrylate (POA), and acylic acid (PAA) blocks. The investigation by high resolution nuclear magnetic resonance (1H NMR) shows that intramolecular hydrogen bonds between the PAM and PAA blocks lead to compact molecular arrangement at quite low pH values, and the motion of the phenoxy side chain of the POA blocks is somewhat restricted. With the increase in pH value of the solution, the carboxylic acid of the PAA block gradually dissociates, which weakens hydrogen bonds between the PAM and PAA blocks. The decrease in D w, self-diffusion coefficient of water, indicates the growth in aggregate size of the template copolymer. The cross peaks between amide protons and backbone protons shown in 2D nuclear overhauser spectroscopy (NOESY) spectra imply the existence of the intermolecular hydrogen bonding interaction between PAM and PAA blocks. After the carboxylic acid of the PAA block is completely dissociated in alkaline solution, the electrostatic repulsion of the carboxylic ion makes the molecular chain of the copolymer exhibit more outstretched. Consequently, the phenoxy groups (the side chain of the POA block) have more space to move.

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Acknowledgements

Financial supports by the National Key Basic Research Development Program “Fundamental Studies of the Extensively Enhanced Petroleum Recovery” (G1999022503) and by the National Natural Science Foundation of China (20373087) are gratefully acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics (Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences), Wuhan, 430071, People’s Republic of China

    Ai-Hong Liu, Shi-Zhen Mao, Mai-Li Liu & You-Ru Du

  2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100101, People’s Republic of China

    Yu-Xi Zhang, Fei-Peng Wu, Miao-Zhen Li & Er-Jian Wang

  3. College of Chemistry and Molecular Science, Wuhan University, Wuhan, 430072, People’s Republic of China

    Gong-Zhen Cheng

  4. Graduate School of the Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Ai-Hong Liu

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  1. Ai-Hong Liu
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  2. Shi-Zhen Mao
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  3. Mai-Li Liu
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  4. Yu-Xi Zhang
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  9. You-Ru Du
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Correspondence to Shi-Zhen Mao or Mai-Li Liu.

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Liu, AH., Mao, SZ., Liu, ML. et al. 1H NMR study on microstructure of a novel acrylamide/methacrylic acid template copolymer in aqueous solution. Colloid Polym Sci 285, 381–388 (2007). https://doi.org/10.1007/s00396-006-1580-x

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  • DOI: https://doi.org/10.1007/s00396-006-1580-x

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