Citation: SHI Ce, CAI Yuyang, CUI Fengchao, LI Yunqi. Characterization of Microscopic Structure of Nafion in Dispersion Using Small Angle X-Ray Scattering[J]. Chinese Journal of Applied Chemistry, ;2019, 36(12): 1406-1412. doi: 10.11944/j.issn.1000-0518.2019.12.190222 shu

Characterization of Microscopic Structure of Nafion in Dispersion Using Small Angle X-Ray Scattering

SHI Ce ^a,b ,
CAI Yuyang ^a,c ,
CUI Fengchao ^a,c ,
LI Yunqi ^a,c,,

a.
Key Laboratory of High-Performance Synthetic Rubber and Its Composite Materials, Changchun Institute of Applied Chemistry, Chinese Acdemy of Sciences, Changchun 130022, China
b.
University of Chinese Academy of Sciences, Beijing 100049, China
c.
University of Science and Technology of China, Hefei 230026, China

Corresponding author: LI Yunqi, yunqi@ciac.ac.cn
Received Date: 17 August 2019
Revised Date: 11 September 2019
Accepted Date: 18 September 2019

Fund Project: the National Natural Science Foundation of China U1832177Supported by the National Natural Science Foundation of China(No.21774128, No.U1832177), and the Key Research Projects in Frontier Science of the Chinese Academy of Sciences(No.QYZDY-SSW-SLH027)the National Natural Science Foundation of China 21774128the Key Research Projects in Frontier Science of the Chinese Academy of Sciences QYZDY-SSW-SLH027

Figures(2)

Small angle X-ray scattering was used to characterize the microscopic structure of Nafion in its dispersion composed by different volume ratios of N-methylformamide and n-butanol. The results show that Nafion forms typical micelle structures in its dispersion, because of the synergistic effect of rigidity of main chain and hydrophobicity/hydrophilicity of main/side chain. The radius of gyration(R_g) of micelles exhibits the scale of -0.42 as the increase of Nafion mass concentration, which is in consistent with the theoretical scale of polyelectrolyte in salt free solvents. The correlation length between micelles shows a scale of -0.13, identical to the theoretical scale of typical neutral polymer solutions. Lower polarity n-butanol promotes the formation of long micelles, while high polarity N-methylformamide promotes the dispersion of Nafion. This study provides a clear guidance for understanding the properties of Nafion dispersions and the formation of micro-structure of Nafion films prepared by wet method.
- small angle X-ray scattering,
- Nafion dispersion,
- micelle
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