دورية أكاديمية
Mechanisms and Characterization of the Pulsed Electron-Induced Grafting of Styrene onto Poly(tetrafluoroethylene-co-hexafluoropropylene) to Prepare a Polymer Electrolyte Membrane.
| العنوان: | Mechanisms and Characterization of the Pulsed Electron-Induced Grafting of Styrene onto Poly(tetrafluoroethylene-co-hexafluoropropylene) to Prepare a Polymer Electrolyte Membrane. |
|---|---|
| المؤلفون: | Kim B; a Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115.; c Korea Atomic Energy Research Institute, Daejeon, 305353, Republic of Korea., Weaver A; a Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115., Chumakov M; a Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115., Pazos IM; a Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115., Poster DL; d National Institute of Standards and Technology, Gaithersburg, Maryland 20899., Gaskell K; b Department of Chemistry, University of Maryland, College Park, Maryland 20742-2115., Han DH; e School of Chemical Engineering and Technology, Yeungnam University, Gyeongsangbuk-do, Republic of Korea., Scherer G; f Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland., Yandrasits MA; g 3M Fuel Cell Components Program, St. Paul, Minnesota 55144., Lee BC; c Korea Atomic Energy Research Institute, Daejeon, 305353, Republic of Korea., Al-Sheikhly M; a Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115. |
| المصدر: | Radiation research [Radiat Res] 2018 Sep; Vol. 190 (3), pp. 309-321. Date of Electronic Publication: 2018 Jun 18. |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Radiation Research Society Country of Publication: United States NLM ID: 0401245 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1938-5404 (Electronic) Linking ISSN: 00337587 NLM ISO Abbreviation: Radiat Res Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: Bozeman, MT : Radiation Research Society Original Publication: Charlottesville, VA : Kluge Carden Jennnings Pub. Co. |
| مواضيع طبية MeSH: | Membranes, Artificial*, Electrolytes/*radiation effects , Polymerization/*radiation effects , Polymers/*chemistry, Electrolytes/chemistry ; Electrons ; Free Radicals/chemistry ; Free Radicals/radiation effects ; Gamma Rays ; Kinetics ; Polymers/radiation effects ; Polytetrafluoroethylene/analogs & derivatives ; Polytetrafluoroethylene/chemistry ; Polytetrafluoroethylene/radiation effects ; Styrene/chemistry ; Styrene/radiation effects |
| مستخلص: | During the pulsed-electron beam direct grafting of neat styrene onto poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) substrate, the radiolytically-produced styryl and carbon-centered FEP radicals undergo various desired and undesired competing reactions. In this study, a high-dose rate is used to impede the undesired free radical homopolymerization of styrene and ensure uniform covalent grafting through 125-μm FEP films. This outweighs the enhancement of the undesired crosslinking reactions of carbon-centered FEP radicals and the dimerization of the styryl radicals. The degree of uniform grafting through 125-μm FEP films increases from ≈8%, immediately after pulsed electron irradiation to 33% with the subsequent thermal treatment exceeding the glass transition temperature of FEP of 39°C. On the contrary, steady-state radiolysis using 60 Co gamma radiolysis, shows that the undesired homopolymerization of the styrene has become the predominant reaction with a negligible degree of grafting. Time-resolved fast kinetic measurements on pulsed neat styrene show that the styryl radicals undergo fast decays via propagation homopolymerization and termination reactions at an observed reaction rate constant of 5 × 10 8 l · mol -1 · s -1 . The proton conductivity of 25-μm film at 80°C is 0.29 ± 0.01 s cm -1 and 0.007 s cm -1 at relative humidity of 92% and 28%, respectively. The aims of this work are: 1. electrolyte membranes are prepared via grafting initiated by a pulsed electron beam; 2. postirradiation heat-treated membranes are uniformly grafted, ideal for industry; 3. High dose rate is the primary parameter to promote the desired reactions; 4. measurement of kinetics of undesired radiation-induced styrene homopolymerization; and 5. The conductivity of prepared membranes is on par or higher than industry standards. |
| References: | Chem Rev. 2014 Dec 24;114(24):12278-329. (PMID: 25418784) J Res Natl Bur Stand A Phys Chem. 1961 Jul-Aug;65A(4):375-387. (PMID: 32196184) |
| معلومات مُعتمدة: | 9999-NIST United States Intramural NIST DOC |
| المشرفين على المادة: | 0 (Electrolytes) 0 (Free Radicals) 0 (Membranes, Artificial) 0 (Polymers) 0 (fluorinated ethylene propylene) 44LJ2U959V (Styrene) 9002-84-0 (Polytetrafluoroethylene) |
| تواريخ الأحداث: | Date Created: 20180619 Date Completed: 20180921 Latest Revision: 20231004 |
| رمز التحديث: | 20240628 |
| مُعرف محوري في PubMed: | PMC6241253 |
| DOI: | 10.1667/RR15006.1 |
| PMID: | 29912620 |
| قاعدة البيانات: | MEDLINE |
كن أول من يترك تعليقا!