scholarly journals Study on the structure of polymer electrolyte membrane using small angle X-ray scattering and positron annihilation spectroscopy

2018 ◽  
Vol 1 (6) ◽  
pp. 197-205
Author(s):  
Tap Duy Tran ◽  
Khiem Duy Do ◽  
Nguyen Ly La ◽  
Tuyet Anh Luu
Keyword(s):  
Polymer Electrolyte ◽  
Positron Annihilation ◽  
Small Angle ◽  
Polymer Electrolyte Membrane ◽  
Positron Annihilation Spectroscopy ◽  
Positron Annihilation Lifetime ◽  
Amorphous Phases ◽  
Electrolyte Membrane ◽  
X Ray Scattering ◽  
Poly Ethylene

The structure of poly (styrenesulfonic acid)- grafted poly(ethylene-co- tetrafluoroethylene) polymer electrolyte membrane (ETFE-PEM) was investigated by comparison with those of precursor original ETFE film and styrene-grafted films (grafted-ETFE) using positron annihilation lifetime spectroscopy (PALS) and small angle Xray scattering (SAXS). PALS of these samples indicated that there were two lifetime components, which were assigned to the annihilation of ortho- Positronium (o-Ps). The two types of o-Ps relate to the free volume at sub nanoscale locating in the crystalline and amorphous phases. SAXS profiles of these samples indicated the presence of lamellar stacks andlamellar grains. Sizes of lamellar stacks and lamellar grains varied significantly during the graftingprocess, whereas only change a little bit at sulfonation process and at wet state. A compination of PALS and SAXS allowed us to investigate the structures of ETFEPEMs with scale ranging from several Ångströms to micrometer.

Effect of humidity and temperature on polymer electrolyte membrane (Nafion 117) studied by positron annihilation spectroscopy

2010 ◽  
Vol 195 (18) ◽  
pp. 5934-5937 ◽  
Author(s):  
Yuji Shibahara ◽  
Hemant S. Sodaye ◽  
Yoko Akiyama ◽  
Shigehiro Nishijima ◽  
Yoshihide Honda ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Positron Annihilation ◽  
Polymer Electrolyte Membrane ◽  
Positron Annihilation Spectroscopy ◽  
Electrolyte Membrane

Annihilation Process of Positron in Degraded Nafion®-117

2012 ◽  
Vol 733 ◽  
pp. 53-56 ◽  
Author(s):  
Yoshihide Honda ◽  
Yoshikazu Aoyagi ◽  
Sachiko Tojo ◽  
Yoko Akiyama ◽  
Shigehiro Nishijima
Keyword(s):  
Polymer Electrolyte ◽  
Positron Annihilation ◽  
Electronic State ◽  
Cluster Size ◽  
Polymer Electrolyte Membrane ◽  
Degradation Process ◽  
Positron Annihilation Spectroscopy ◽  
Annihilation Process ◽  
Good Tool ◽  
Electrolyte Membrane

Annihilation process of positron in Nafion-117 was investigated under several kinds of conditions to elucidate degradation process of polymer electrolyte membrane. It was found that ortho-positronium stayed beside cluster wall and side chains and its lifetime reflected cluster size. Annihilation process of positron was found to be greatly influenced by the electronic state of sulfonic group. These results showed that positron annihilation spectroscopy would be good tool to detect degradation of polymer electrolyte membrane.

Micro Structural Changes in Welded AlCuLi-Alloys by Positron Annihilation Spectroscopy, SAXS and DSC

2016 ◽  
Vol 877 ◽  
pp. 387-392
Author(s):  
Danny Petschke ◽  
Torsten E.M. Staab
Keyword(s):  
Positron Annihilation ◽  
Structural Changes ◽  
Base Material ◽  
Positron Annihilation Spectroscopy ◽  
Weld Nugget ◽  
Scanning Calorimetry ◽  
Positron Annihilation Lifetime ◽  
Friction Stir ◽  
X Ray Scattering ◽  
Type Size

We follow changes in the micro structure at several distances from the weld nugget of friction stir welded AlCuLi-alloy (AA2198) plates occurring due to the tool movement and the created heat by employing different methods: Small Angle X-ray Scattering (SAXS), giving information on type, size and density of precipitates, Differential Scanning Calorimetry (DSC), giving information on formed precipitates by their dissolution signal, and positron annihilation lifetime spectroscopy (PALS), being sensitive to vacancies and dislocations as well as to the formation and growth of precipitates. We start by characterizing the base material as a reference and proceed via the heat-affected zone to the weld nugget. By the use of complementary methods, we obtain information on structure, kind and distribution of precipitates and correlate this with hardness measurements.

scholarly journals EFFECT OF PRE- γ-IRRADIATION DOSE ON THE DURABILITY OF THE SULFONATED ETFE-G-POLYSTYRENE CONDUCTING MEMBRANES

2012 ◽  
Vol 5 (2) ◽  
pp. 180
Author(s):  
Upita Septiani ◽  
Hitoshi Kubota
Keyword(s):  
Aqueous Solution ◽  
Polymer Electrolyte ◽  
Irradiation Dose ◽  
Polymer Electrolyte Membrane ◽  
Γ Irradiation ◽  
Grafted Polymer ◽  
Electrolyte Membrane ◽  
Poly Ethylene ◽  
Conducting Membranes ◽  
Etfe Film

The influence of pre-g-irradiation dose on durability of the poly(ethylene-co-tetrafluoroethylene) (ETFE) film-based radiation-grafted polymer electrolyte membrane was investigated. The durability of membrane was found to be strongly influence by g-ray pre-irradiation dose. The durability was tested in a 3% H2O2 aqueous solution at 60°C. The durability of the polymer electrolyte membrane with a degree of grafting of about 30% prepared by lower pre-irradiation dose was more stable than that of the membrane prepared with higher pre-irradiation dose.

Microstructure Characterization of Iridium Oxide Catalyst for Polymer Electrolyte Membrane Water Electrolyzer Using X-Ray Scattering

2021 ◽  
Vol MA2021-01 (49) ◽  
pp. 1967-1967
Author(s):  
Jaehyung Park ◽  
Janghoon Park ◽  
Sunilkumar Khandavalli ◽  
Scott A Mauger ◽  
Deborah J. Myers ◽  
...  
Keyword(s):  
Polymer Electrolyte ◽  
Oxide Catalyst ◽  
Polymer Electrolyte Membrane ◽  
Iridium Oxide ◽  
Microstructure Characterization ◽  
X Ray ◽  
Electrolyte Membrane ◽  
X Ray Scattering ◽  
Ray Scattering
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