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Self-Assembly of Pluronic F127 Diacrylate in Ethylammonium Nitrate: Structure, Rheology, and Ionic Conductivity before and after Photo-Cross-Linking
journal contribution
posted on 2016-07-15, 18:18 authored by Carlos R. López-Barrón, Ru Chen, Norman
J. Wagner, Peter J. BeltramoThe
self-assembly of an end-functionalized PEO106–PPO70–PEO106 triblock copolymer (BCP) with acrylic
end groups (Pluronic F127 diacrylate or FDA) in a protic ionic liquid
(deuterated ethylammonium nitrate, dEAN) is studied using small-angle
neutron scattering, shear rheology, and dielectric spectroscopy. This
functionalization constitutes less than 1 wt % of the copolymer and
has no effect on micelle formation in dEAN. The sol–gel transition
and the supramolecular crystal structure of the concentrated FDA/dEAN
solutions are also found to be unaffected by the acrylation of the
end groups. Photo-cross-linking results in viscoelasticity enhancement
of the FDA/dEAN solutions with FDA contents below the gel point. Cross-linking
gels produces soft elastomers with exceptional elasticity and conductivity
comparable to the un-cross-linked solutions. Tuning BCP microstructure
via self-assembly in ionic liquids followed by chemical cross-linking
is shown to be a promising route for the design of materials with
specific mechanical properties and ionic conductivities.
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Keywords
shear rheologysupramolecular crystal structuregel pointdEANsolutionIonic ConductivityPluronic F 127 diacrylatemicelle formationEthylammonium Nitratedielectric spectroscopyacrylic end groupsPEOTuning BCP microstructurePluronic F 127 Diacrylatecopolymerviscoelasticity enhancementPPOend groupsFDA contents
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