Search engine for discovering works of Art, research articles, and books related to Art and Culture
Javascript must be enabled to continue!
Positron Annihilation Lifetime Study of Graft-Type Fluorinated Polymer Electrolyte Membranes
View through CrossRef
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.
Trans Tech Publications, Ltd.
Title: Positron Annihilation Lifetime Study of Graft-Type Fluorinated Polymer Electrolyte Membranes
Description:
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.
Related Results
Advances in applications of positron annihilation spectroscopy to investigating semiconductor microstructures
Advances in applications of positron annihilation spectroscopy to investigating semiconductor microstructures
Positron annihilation spectroscopy has unique advantage for detecting the micro-defects and microstructures in materials,especially for investigating the negatively charged defects...
Positron Annihilation Studies of Materials
Positron Annihilation Studies of Materials
Abstract
This chapter gives a concise overview of the probe techniques of positron annihilation and their use for studying the electronic structure and open volume defect...
Effects of source correction on positron annihilation lifetime spectroscopic analysis of graft-type polymer electrolyte membranes
Effects of source correction on positron annihilation lifetime spectroscopic analysis of graft-type polymer electrolyte membranes
Introduction: Recently, the free-volume hole features of poly(styrene sulfonic acid) (PSSA)-grafted poly(ethylene-co-tetrafluoroethylene) polymer electrolyte membranes (ETFE-PEMs) ...
Positron Annihilation Studies of Materials
Positron Annihilation Studies of Materials
AbstractPositron annihilation provides sensitive and versatile probe techniques in materials science that can characterize electronic structure and vacancy‐type, open volume, defec...
Polymer Electrolyte Membranes
Polymer Electrolyte Membranes
Polymer electrolyte membranes (PEM) with good properties are essential for the improvement of electrochemical operations. The increase in properties of polymer electrolyte membrane...
Fluorinated Lipids Conjugated to Peptide Antigens do not Induce Immune Responses Against Cervical Cancer
Fluorinated Lipids Conjugated to Peptide Antigens do not Induce Immune Responses Against Cervical Cancer
Background: Despite the high safety profile of peptide-based vaccines over conventional counterparts, the inability of small peptides to produce a strong immune response represents...
Barrier Polymers
Barrier Polymers
AbstractBarrier polymers are used for many packaging and protective applications. As barriers they separate a system, such as an article of food or an electronic component, from an...
Barrier Polymers
Barrier Polymers
AbstractBarrier polymers are used for many packaging and protective applications. As barriers they separate a system, such as an article of food or an electronic component, from an...