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Insight into Hydration Behavior of Poly(Hydroxypropyl Acrylate) Block Copolymer by Temperature-Dependent Infrared Spectroscopy

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Sense the Real Change: Proceedings of the 20th International Conference on Near Infrared Spectroscopy (ICNIR 2021)

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Abstract

Dynamic light scattering (DLS), microscope, temperature-dependent infrared (IR) spectroscopy with perturbation correlation moving window (PCMW) were used to investigate the phase transition of a thermo-sensitive copolymer poly(N,N-dimethylacrylamide)-b-poly(hydroxypropyl acrylate)-b-poly(N,N-dimethylacrylamide) (PDMAA-b-PHPA-b-PDMAA). The copolymer was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. In the DLS analysis, the sudden increase in particle size at 49 ℃ and the polymer droplets appearing at 49 ℃ in the microscope photos indicate that the lower critical solution temperature (LCST) of the copolymer is around 49 ℃. IR spectra show that the OH groups of PHPA change from hydration states to free ones. The redshift of the spectra in C-H bands indicates the dehydration of CH groups. The hydration C = O bands transform into free states or the other part, which owns stronger intermolecular interactions. Moreover, the O-H bands show a more responsive to temperature during the phase transition by PCMW analysis. The reduced hydrophilicity of O-H bands is not enough to stabilize the polymer in water, which leads to a phase transition.

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Acknowledgments

This study is financially supported by the National Key Research and Development Program of China (Grant No. 2020YFE0100300).

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Authors and Affiliations

  1. State Key Laboratory of Organic-Inorganic Composites, Bei**g University of Chemical Technology, Bei**g, 100029, People’s Republic of China

    C. **ong, S. Han, Y. Guo & L. Guo

  2. Bei**g Engineering Research Center of Synthesis and Application of Waterborne Polymer, Bei**g University of Chemical Technology, Bei**g, 100029, People’s Republic of China

    L. Guo

Authors
  1. C. **ong
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  2. S. Han
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  4. L. Guo
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Corresponding author

Correspondence to L. Guo .

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Editors and Affiliations

  1. Analytical Research Department, Sinopec Research Institute of Petroleum Processing, Bei**g, China

    **aoli Chu

  2. College of Materials Science and Engineering, Bei**g University of Chemical Technology, Bei**g, China

    Longhai Guo

  3. College of Food Science and Nutritional Engineering, China Agricultural University, Bei**g, China

    Yue Huang

  4. College of Materials Science and Engineering, Bei**g University of Chemical Technology, Bei**g, China

    Hongfu Yuan

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**ong, C., Han, S., Guo, Y., Guo, L. (2022). Insight into Hydration Behavior of Poly(Hydroxypropyl Acrylate) Block Copolymer by Temperature-Dependent Infrared Spectroscopy. In: Chu, X., Guo, L., Huang, Y., Yuan, H. (eds) Sense the Real Change: Proceedings of the 20th International Conference on Near Infrared Spectroscopy. ICNIR 2021. Springer, Singapore. https://doi.org/10.1007/978-981-19-4884-8_35

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