SMALL-ANGLE X-RAY-SCATTERING STUDY OF PERFLUORINATED IONOMER MEMBRANES .1. ORIGIN OF 2 SCATTERING MAXIMA
SMALL-ANGLE X-RAY-SCATTERING STUDY OF PERFLUORINATED IONOMER MEMBRANES .1. ORIGIN OF 2 SCATTERING MAXIMA
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DOI：
10.1021/ma50006a032
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发表时间：
1981-01-01
期刊：
影响因子：
5.5
通讯作者：
KAWAI, H
中科院分区：
文献类型：
--
作者：
FUJIMURA, M;HASHIMOTO, T;KAWAI, H
Small-angle X-ray scattering (SAXS) from perfluorinated ionomermembranes was studied in order to investigate their internal supermolecular structure. The SAXS curves generally exhibit scattering maxima at s=(2 sin)/\nearly equal to 0.07 and 0.3 nm'1 (and X being one-half the scattering angle and the wavelength of the X-rays, respectively). Simultaneous investigation of wide-angle X-ray scattering indicated that the SAXS maximum at the smaller s is associated with crystallinity (the larger the crystallinity, the more distinct is the SAXS maximum) and is attributed to a long identity period in lamellar crystals. The maximum at the larger s is associated with the existence of ionic clusters whose size is a function of the number of perfluoroether side chains (with pendant sulfonicacid or carboxylic acid groups and their salts) per chain, the nature of the ionic sites (eg, the electrostatic interaction energy released upon cluster formation), the temperature, and the amount of water absorbed by the membranes.
