Fluorinated Ionomers - download pdf or read online

By Walther Grot

Content material:
Seris Page

, Page ii
Front Matter

, Page iii
Copyright

, Page iv
Plastics layout Library

, Page ix
PDL Fluorocarbon sequence Editor’s Preface

, Page xi
Preface

, Page xiii
Acknowledgements

, Page xv
1 - Introduction

, Pages 1-3
2 - History

, Pages 5-10
3 - Manufacture

, Pages 11-48
4 - Properties

, Pages 49-79
5 - Applications

, Pages 81-156
6 - gasoline Cells and Batteries

, Pages 157-184
7 - advertisement Membrane Types

, Pages 185-199
8 - monetary Aspects

, Pages 201-209
9 - Experimental Methods

, Pages 211-233
10 - warmth Sealing and Repair

, Pages 235-237
11 - dealing with, garage, and Installation

, Pages 239-242
12 - Toxicology, defense, and Disposal

, Pages 243-246
Appendix A - A Chromic Acid Regeneration System

, Pages 247-248
Appendix B - Laboratory Chlor-alkali Cell

, Page 249
Appendix C - resolution forged Nafion Film

, Pages 251-257
Appendix D - Plastic-Based Bipolar Plates

, Pages 259-262
DuPont™ Nafion® membranes: Membranes for gas Cells

, Pages 263-269
DuPont™ Nafion® PFSA Membranes N-112, NE-1135, N-115, N-117, NE-1110: perfluorosulfonic acid polymer

, Pages 271-276
Suppliers and Resources

, Pages 277-278
Glossary and internet Sites

, Pages 279-285
Index

, Pages 287-296

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Extra resources for Fluorinated Ionomers

Example text

39]. In all these cases, the graft polymer is subsequently sulfonated. The stability of films obtained by radiation grafting of styrene on FEP can be improved by the addition of divinyl benzene (DVB) as a cross-linking agent to the grafting solution [40]. As an example, a 25-µm-thick FEP film (FEP 100A, DuPont) was irradiated by an electron beam with a dose of 3–5 kGy, followed by introduction into a stainless steel reactor containing the grafting solution. The grafting solution consisted of styrene containing 0–20% DVB dissolved in an isopropanol/water mixture.

2). 3 [42]). Stone et al. described the radiation grafting of trifluorovinyl aromatics on a base film made of an ethylene/TFE copolymer (TEFZEL®) [43]. 2 Polymerization of Partially Fluorinated Monomers The most commonly used non-fluorinated ion exchange resins are based on cross-linked polystyrene. In this structure, the benzylic carbon (the backbone carbon to which the aromatic ring is attached) is most sensitive to oxidation. Even minor cleavage of the backbone results in drastic loss of MW and/ or cross-linking.

The film was then repressed at low pressure at 150°C for 10 min. Film thickness was about 80 µm. The properties and fuel cell performance of films containing 10% and 20% titanium dioxide were compared with those made without titanium dioxide. Recently, Zaidi et al. reported on composites prepared by casting a mixture containing 10–50% of boron phosphate in a solution of a perfluoro sulfonic acid ionomer in isopropanol. An increased conductivity, compared to films cast from the unmodified solution, was observed for composites containing 20% or more of boron phospate [52].

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