Positron Annihilation Lifetime Study of Graft-Type Fluorinated Polymer Electrolyte Membranes

Shin-ichi Sawada; Atsuo Kawasuso; Masaki Maekawa; Akihiro Suzuki; Takayuki Terai; Yasunari Maekawa

doi:10.4028/www.scientific.net/MSF.607.70

Paper Titles

Free Volume and Oxygen Permeability in Polymers Related to Polymer Electrolyte Fuel Cells
p.58

Effect of Oxygen on the Free Volume Property of Poly (Ether-Urethane) Irradiated by Neutron
p.61

Seeking the Good Fitting Procedure of PALS Polymer Spectra
p.64

Studying Polyamide Water Separation Film Using Slow Positron Beam
p.67

Positron Annihilation Lifetime Study of Graft-Type Fluorinated Polymer Electrolyte Membranes
p.70

Analysis of Radiation Induced Phenomena in a Polymer Electrolyte Membrane with Positron Annihilation Technique
p.73

The Interface of Multi-Phase Polymer Systems Studied by Positron Annihilation
p.76

The Effect of Anneal on PP and PA Blends Studied by Positron
p.79

Investigation of Free Volume in Epoxy Resins Studied by PALS
p.82

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Positron Annihilation Lifetime Study of Graft-Type Fluorinated Polymer Electrolyte Membranes

Abstract:

Positron annihilation lifetime spectroscopy (PALS) measurements were performed on polymer electrolyte membranes (PEMs) synthesized by radiation-induced graft polymerization of styrene into crosslinked-polytetrafluoroethylene (cPTFE) films and subsequent sulfonation. The base cPTFE and polystyrene grafted films were also measured as references. The cPTFE based PEM was found to have free-volume holes with different radius of 0.28-0.30 nm and 0.44-0.45 nm. The larger holes may be located in PTFE amorphous regions, while the smaller ones are considered to exist in both PTFE crystallites and poly(styrene sulfonic acid) grafts containing no water.