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The Multilevel Structure of Sulfonated Syndiotactic-Polystyrene Model Polyelectrolyte Membranes Resolved by Extended Q-range Contrast Variation SANS
- Source :
- Membranes, Volume 9, Issue 11, Membranes 9(11), 136-158 (2019). doi:10.3390/membranes9110136, Membranes, Vol 9, Iss 11, p 136 (2019)
- Publication Year :
- 2019
- Publisher :
- MDPI AG, 2019.
-
Abstract
- Membranes based on sulfonated synditoactic polystyrene (s-sPS) were thoroughly characterized by contrast variation small-angle neutron scattering (SANS) over a wide Q-range in dry and hydrated states. Following special sulfonation and treatment procedures, s-sPS is an attractive material for fuel cells and energy storage applications. The film samples were prepared by solid-state sulfonation, resulting in uniform sulfonation of only the amorphous phase while preserving the crystallinity of the membrane. Fullerenes, which improve the resistance to oxidation decomposition, were incorporated in the membranes. The fullerenes seem to be chiefly located in the amorphous regions of the samples, and do not influence the formation and evolution of the morphologies in the polymer films, as no significant differences were observed in the SANS patterns compared to the fullerenes-free s-sPS membranes, which were investigated in a previous study. The use of uniaxially deformed film samples, and neutron contrast variation allowed for the identification and characterization of different structural levels with sizes between nm and &mu<br />m, which form and evolve in both the dry and hydrated states. The scattering length density of the crystalline regions was varied using the guest exchange procedure between different toluene isotopologues incorporated into the sPS lattice, while the variation of the scattering properties of the hydrated amorphous regions was achieved using different H2O/D2O mixtures. Due to the deformation of the films, the scattering characteristics of different structures can be distinguished on specific detection sectors and at different detection distances after the sample, depending on their size and orientation.
- Subjects :
- chemistry.chemical_classification
small-angle neutron scattering
Materials science
Scattering
lcsh:TP155-156
Polymer
Neutron scattering
lcsh:Chemical technology
Small-angle neutron scattering
Article
proton exchange membranes
Amorphous solid
polymers_plastics
semi-crystalline polymers
chemistry.chemical_compound
Crystallinity
Membrane
chemistry
Chemical engineering
ddc:570
lcsh:TP1-1185
Polystyrene
lcsh:Chemical engineering
Subjects
Details
- Database :
- OpenAIRE
- Journal :
- Membranes, Volume 9, Issue 11, Membranes 9(11), 136-158 (2019). doi:10.3390/membranes9110136, Membranes, Vol 9, Iss 11, p 136 (2019)
- Accession number :
- edsair.doi.dedup.....495ff640c33ca7f8014c2c9bafdba9e2
- Full Text :
- https://doi.org/10.20944/preprints201909.0328.v1