Citation: Changlin Su, Wensheng Cai, Xueguang Shao. Water as a probe for the temperature-induced self-assembly transition of an amphiphilic copolymer[J]. Chinese Chemical Letters, ;2025, 36(4): 110095. doi: 10.1016/j.cclet.2024.110095 shu

Water as a probe for the temperature-induced self-assembly transition of an amphiphilic copolymer

Changlin Su ^a ,
Wensheng Cai ^{a, b, c} ,
Xueguang Shao ^{a, b, c, d, *,}

a.
Research Center for Analytical Sciences, College of Chemistry, Nankai University, Tianjin 300071, China
b.
Tianjin Key Laboratory of Biosensing and Molecular Recognition, Tianjin 300071, China
c.
Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
d.
State Key Laboratory of Medicinal Chemical Biology, Tianjin 300071, China

xshao@nankai.edu.cn

Received Date: 26 January 2024
Revised Date: 2 May 2024
Accepted Date: 5 June 2024
Available Online: 6 June 2024

Figures(6)

The hydration state of amphiphilic block copolymers during the self-assembly transition is closely related to the structure and properties of copolymers. In this study, the temperature-induced self-assembly of copolymer poly(N,N-dimethylacrylamide)-poly(diacetone acrylamide) (PDMAA₃₀-PDAAM₆₀)₂ in aqueous solution was monitored by near-infrared spectroscopy with water as a probe. The wavelet packet transform was employed to improve the spectral resolution. The spectral information of hydrated water surrounding the hydrophilic PDMAA and hydrophobic PDAAM blocks was then extracted, revealing the significant roles of water in morphological transition of the copolymer from spherical to worm-like micelles. Specifically, water molecules interacting with N atoms and C=O groups of the hydrophilic block gradually decrease during the morphological transition, while hydrogen-bond structures NH-CO of the hydrophobic block gradually break, bringing more water molecules into contact with the hydrophobic block. This work provides a foundation for exploring the role of water molecules during the self-assembly transition of complex block copolymers.
- Amphiphilic block copolymers,
- Near-infrared spectroscopy,
- Wavelet packet transform,
- Temperature-induced self-assembly,
- Morphological transition
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