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

doi:10.11944/j.issn.1000-0518.2019.12.190222

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (12): 1406-1412.DOI: 10.11944/j.issn.1000-0518.2019.12.190222

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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^*

^aKey Laboratory of High-Performance Synthetic Rubber and Its Composite Materials,Changchun Institute of Applied Chemistry,Chinese Acdemy of Sciences,Changchun 130022,China
^bUniversity of Chinese Academy of Sciences,Beijing 100049,China
^cUniversity of Science and Technology of China,Hefei 230026,China

Received:2019-08-17 Accepted:2019-09-18 Published:2019-12-01 Online:2019-12-10
Contact: LI Yunqi
Supported by:
Supported 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)

Abstract

Abstract:

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.

Key words: small angle X-ray scattering, Nafion dispersion, micelle

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.

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

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