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Study of the temperature/HCO3- response mechanism of hyperbranched poly(bis-acrylamide)s

Polymer Journal volume 55, pages 1295–1305 (2023)Cite this article

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Abstract

The aqueous solution of hyperbranched poly(bis-acrylamide)s (HPEAMs) prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization has a lower critical solution temperature (LCST), which can also respond to HCO3-. However, the phase change mechanism of HPEAMs has not yet been proven. In this paper, N-(2-propionamidoethyl)acrylamide was designed as a monomer and chain transfer agent (CTA), and the corresponding linear polymers, hyperbranched polymers and hyperbranched copolymers were further prepared. Fourier transform infrared spectroscopy, 1H nuclear magnetic resonance, ultraviolet‒visible spectroscopy, dynamic light scattering and zeta potential were employed to characterize the structure and phase transition behavior. The results confirmed that the bis-acrylamide unit is hydrophilic and the CTA unit is hydrophobic. The hydrophilic-hydrophobic balance system constructed by the unit of bis-acrylamide and CTA endowed the hyperbranched polybisacrylamide with temperature-responsive behavior, and the carboxyl group in the CTA structural unit is the responsive group that makes it possible to tune the LCST in the presence of HCO3-.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (no. 22007026), Natural Science Foundation of Hebei Province (no. B2019201221 and B2019201337), Foundation of Hebei Education Department (no. BJ2021009), Central Guidance on Local Science and Technology Development Fund of Hebei Province (no. 226Z2604G) and Advanced Talents Incubation Program of the Hebei University.

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Authors and Affiliations

  1. College of Chemistry and Materials Science, Hebei University, Baoding, 071002, China

    Qian Zhou, Zhaolei Jia, Xuejiao Gao, Xinwu Ba & Libin Bai

  2. Key Laboratory of Pathogenesis Mechanism and Control of Inflammatory-Autoimmune Disease of Hebei Province, College of Basic Medical Sciences, Hebei University, Baoding, 071002, China

    Bing Liu & Yuangong Zhang

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  1. Qian Zhou
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Correspondence to Yuangong Zhang or Libin Bai.

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Zhou, Q., Liu, B., Jia, Z. et al. Study of the temperature/HCO3- response mechanism of hyperbranched poly(bis-acrylamide)s. Polym J 55, 1295–1305 (2023). https://doi.org/10.1038/s41428-023-00811-7

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