Thermally Triggered Self-Assembly of PSSS50-b-PNIPAM300 in Binary Solvent Studied by NMR Spectroscopy

doi:10.11938/cjmr20192736

Abstract

Abstract: Thermo-responsiveness and self-assembly behaviors of poly(sodium-p-styrene sulfonate)-block-poly (N-isopropylacrylamide) (PSSS₅₀-b-PNIPAM₃₀₀) in pure water and binary solvents (i.e., water/methanol and water/acetone) were investigated by ¹H NMR, dynamic light scattering (DLS), and transmission electron microscopy (TEM). It was found that the PNIPAM chains had a lower lowest critical solution temperature (LCST) in the water/methanol and water/acetone binary solvents than in water. Temperature-induced collapse of PNIPAM in water/acetone binary solvent was evidently weaker compared to the collapses in pure water and water/methanol binary solvent. The DLS and TEM results demonstrated that the self-assembly process and morphology of PSSS₅₀-b-PNIPAM₃₀₀ in aqueous solution could be fine-tuned with the addition of small molecule solvent.

Key words: nuclear magnetic resonance (NMR), self-assembly, block copolymer, binary solvent, thermo-sensitivity

CLC Number:

O482.53

ZHAO Zhi-hui, LIU Biao-lan, YAN Xiao-shuang, WU Shuai-shuai, RU Ge-ying, MAO Shi-zhen, Feng Ji-wen. Thermally Triggered Self-Assembly of PSSS₅₀-b-PNIPAM₃₀₀ in Binary Solvent Studied by NMR Spectroscopy[J]. Chinese Journal of Magnetic Resonance, 2019, 36(4): 502-509.

References

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Thermally Triggered Self-Assembly of PSSS₅₀-b-PNIPAM₃₀₀ in Binary Solvent Studied by NMR Spectroscopy

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