Morphology of sulfonated polyarylenethioethersulfone random copolymer series as proton exchange fuel cells membranes by small angle neutron scattering

Polymer ◽  
2011 ◽  
Vol 52 (24) ◽  
pp. 5615-5621 ◽  
Author(s):  
Mitra Yoonessi ◽  
Hendrik Heinz ◽  
Thuy D. Dang ◽  
Zongwu Bai
Keyword(s):  
Fuel Cells ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Random Copolymer ◽  
Proton Exchange

scholarly journals Microstructure and water distribution in catalysts for polymer electrolyte fuel cells, elucidated by contrast variation small-angle neutron scattering

2019 ◽  
Vol 52 (4) ◽  
pp. 791-799 ◽  
Author(s):  
Satoshi Koizumi ◽  
Satoru Ueda ◽  
Takumi Inada ◽  
Yohei Noda ◽  
Robert A. Robinson
Keyword(s):  
Fuel Cells ◽  
Neutron Scattering ◽  
Polymer Electrolyte ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Water Distribution ◽  
Grazing Incidence ◽  
Polymer Electrolyte Fuel Cells ◽  
Contrast Variation ◽  
Mixed Water

By using small-angle neutron scattering (SANS) reinforced by scanning electron microscopy, the fine structure of catalysts for polymer electrolyte fuel cells has been investigated. The experimental data resulting from contrast variation with mixed light and heavy water (H2O/D2O) are well described by a core–shell model with fluctuations in concentration between water and Nafion. In particular, SANS obtained with the mixed water ratio 30/70, which corresponds to a matching point between mixed water and Nafion, shows a broad scattering maximum, which is attributed to a 5 nm-thick Nafion shell on the surface of the larger carbon particles. After swelling by water, the ionomer layer absorbs water at the 17 wt% level. By changing the H2O/D2O ratio, it was further confirmed that the catalyst with the ionomer exhibits water repellence, whereas the bare catalyst without the ionomer is wetted by water. Because it is very difficult to extract more information, for instance regarding the Pt–Nafion interactions, by means of small-angle scattering, reflectometry and grazing-incidence scattering experiments with neutrons should be attempted on a model catalyst prepared on a flat substrate.

Investigation of Miscibility between iPP and Propylene−Butene Random Copolymer by Small-Angle Neutron Scattering

2007 ◽  
Vol 40 (2) ◽  
pp. 273-277 ◽  
Author(s):  
Yoshinobu Nozue ◽  
Takashi Sakurai ◽  
Hidetake Hozumi ◽  
Tatsuya Kasahara ◽  
Noboru Yamaguchi ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Random Copolymer

Small-angle neutron scattering studies on water soluble complexes of poly(ethylene glycol)-based cationic random copolymer and SDS

Pramana ◽  
2004 ◽  
Vol 63 (2) ◽  
pp. 315-320
Author(s):  
C. K. Nisha ◽  
Sunkara V. Manorama ◽  
Souvik Maiti ◽  
K. N. Jayachandran ◽  
V. K. Aswald ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Random Copolymer ◽  
Water Soluble ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Soluble Complexes

Microstructure and Isotopic Labeling Effects on the Miscibility of Polybutadiene Blends Studied by the Small-Angle Neutron Scattering Technique

1989 ◽  
Vol 166 ◽  
Author(s):  
Charles C. Han ◽  
Hirokazu Hasegawa ◽  
Takeji Hashimoto ◽  
I. Glen Hargis ◽  
S. L. Aggarwal
Keyword(s):  
Neutron Scattering ◽  
Interaction Parameter ◽  
Correlation Length ◽  
Small Angle ◽  
Structure Factor ◽  
Small Angle Neutron Scattering ◽  
Random Copolymer ◽  
Isotopic Labeling ◽  
Interaction Parameters ◽  
Scattering Technique

ABSTRACTDeuterated polybutadiene and protonated polybutadiene (PBD/PBH) blends with various microstructures have been studied by the small-angle neutron scattering experiments. Correlation length, ξ, zero-wavenumber structure factor, S(q=o), and interaction parameter, Xblend have been obtained. All PBD/PBH blends exhibit UCST behavior. With the use of random copolymer theory, the interaction parameter, Xblend, has been successfully separated into X1, X2 and X3 which are interaction parameters between the same isotope labeled 1,2-unit and 1,4-unit, opposite isotope labeled 1,2-unit and 1,4- unit, and opposite isotope labeled 1,2-unit with 1,2-unit or 1,4-unit with 1,4-unit, respectively.

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