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lyotropic ordering for high proton conductivity in sulfonated semialiphatic polyimide thin films - thin polyester film

by:Cailong     2019-07-10
lyotropic ordering for high proton conductivity in sulfonated semialiphatic polyimide thin films  -  thin polyester film
Compared with the high proton-Medium Rigid aromatic skeleton, the effects of the semi-fat skeleton on molecular order and proton conductivity were investigated
Pi film of conductive tissue.
We're two new ones.
Positive sulfur semi-fat polymer (ASSPIs)
With different molecular weights, by in-situ measurements with small grazing incidence, their molecular structure, proton conductivity, water absorption, and the dissociation state of protons and sulfuric acid groups in the film were studied. angle X-Ray scattering (GISAXS)
Micro balance of quartz crystal (QCM)
Fourier transform infrared (FT-IR)
And impedance spectrum.
The decline in the flatness of the semi-fat skeleton reduces the aggregation properties and molecular ordering in the dissolved liquidcrystalline (LC)structure.
However, the highermolecular-
Although the flatness of the main chain is low, the weight ASSPI exhibits a oriented plate layer structure.
The proton conductivity of the oriented plate layer film has a highest value of more than half an order of magnitude 1. 5u2009×u200910-1 Su2009cm-
1 than the flaky film without orientation (3. 0u2009×u200910-2u2009Su2009cm-1)
At 25 °c and 95% RH.
These results show that in hollow pi films, sheet orientation contributes greatly to the high proton conductivity in ASSPI films.
Structural control of high ions
Conductive channels are a significant strategy for energy conversion systems, water treatment and biotechnology [1 [,,,,].
Liquid crystal with nano structure
Organized in order state of size is a promising way to develop ion structure control
Conductive Material], ].
The thermal and soluble properties of liquid crystals can drive various organizational structures. Kato et al.
The switchable ion conductivity induced by wedge-hexagonal phase transition is shownshaped liquid-crystalline (LC)
Ammonium salt [].
Several groups also reported the relationship between the ionic conductivity and LC structure and the properties of thermoinduced liquid crystal and dissolved liquid crystal [,,,]. Design Phase-
The separated conductive channel consisting of a hydrophobic skeleton and a hydrophilic part is to create a high proton-
Conductive Material],,,].
A typical proton exchange membrane (PEMs)
Sulfuric acid base with attachment as side chain to a hydrophobic polymer []. State-of-the-
The Art film is based on the whole fluorine acid (PFSA)
Nafion [reunion], , ].
They have high levels of proton conductivity, water conductivity and persistence.
Protons are transported by water.
Swelling of conductive channel
It is crucial to understand the relationship between the structure and the properties of proton transport, but at many Heights proton-
Conductive polymer because less structural information can be obtained from amorphous or amorphouslike nature.
Our recent studies have shown that the increase in proton conduction rate stems from the increase in molecular order and the increase in LC domain in hydrocarbon-
Sulfuric acid pi (ASPI)thin films [,,,].
In fact, the ASPI film with rigid backbone presents a plate layer-
The structure of the tissue formed by water absorption by the properties of dissolved liquid crystal.
However, the effect of the description of the half-fat skeleton on the tissue structure and proton conductivity of hydrocarbon-ester has not been reported
Polymer film.
This study clarifies the relationship between tissue structure and proton conductivity by introducing a half-fat structure in the main chain.
The low flatness of the backbone can change the organizational structure and order in the dissolved liquid crystal structure.
Without and his colleagues [for polymer Without sulfuric acid base]]
Reported by grazing incidence X-report on the structure of the molecular aggregation in quanfang polyester and semi-fat polyester films
X-ray scattering measurement
In our work, the dissolved liquid crystal structure and proton conductivity were evaluated in two hydrocarbons-
Positive sulfur and half fat pi (ASSPI)
In situ studies of films of different molecular weight using small grazing incidenceangle X-Ray scattering (GISAXS)
Micro balance of quartz crystal (QCM)
Fourier transform infrared spectrum (FT-IR)
Impedance Analysis.
Based on these results, we have systematically evaluated the molecular structure, proton conductivity, water absorption and proton dissociation from sulfuric acid base in the film.
The two ASSPI films have different orientations in plate layer structure and proton conduction rate.
In contrast, in both films, the absorption enthalpy of water is almost the same as the proton dissociation properties from the sulfuric acid base.
Therefore, the orientation of the dissolved layer structure contributes to the enhancement of proton conductivity to a large extent.
Our results show that not only the flatness of the main chain, but also the increase in molecular weight also affects the soluble liquid crystal structure, and the directional plate layer structure enhances the proton conductivity.
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