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ESR spectroscopic investigations of the radiation-grafting of fluoropolymers

Abstract

ESR spectroscopic investigations have clarified the influence of several preparative parameters on the reaction rates and yields obtained in the radiation-grafting method used at PSI to prepare proton-conducting polymer membranes. At a given irradiation dose, a higher concentration of reactive radical sites was detected in ETFE films than in FEP films. This higher concentration explains the higher grafting levels and rates of the ETFE films found in our previous grafting experiments. Taken together, the in-situ ESR experiments and grafting experiments show that the rates of disappearance of radical species and grafting rates and final grafting levels depend strongly on the reaction temperature and the oxygen content of the system. Average grafted chain lengths were calculated to contain about 1,000 monomer units. (author) 2 figs., 4 refs.
Authors:
Huebner, G; Roduner, E; [1]  Brack, H P; Scherer, G G [2] 
  1. University of Stuttgart (Germany)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Publication Date:
Aug 01, 1999
Product Type:
Technical Report
Report Number:
ETDE-CH-9901
Reference Number:
SCA: 400102; PA: CH-99:0E0018; EDB-99:092547; SN: 99002111460
Resource Relation:
Other Information: PBD: 1999; Related Information: Is Part Of Paul Scherrer Institute Scientific Report 1998. Volume V: General Energy; Daum, C.; Leuenberger, J. [eds.]; PB: 121 p.
Subject:
40 CHEMISTRY; ELECTRON SPECTROSCOPY; EXPERIMENTAL DATA; FUEL CELLS; MEMBRANES; POLYMERS; PROGRESS REPORT
OSTI ID:
685675
Research Organizations:
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Journal ID: ISSN 1423-7342; Other: ON: DE99754426; TRN: CH99E0018
Availability:
OSTI as DE99754426
Submitting Site:
CH
Size:
pp. 35-36
Announcement Date:

Citation Formats

Huebner, G, Roduner, E, Brack, H P, and Scherer, G G. ESR spectroscopic investigations of the radiation-grafting of fluoropolymers. Switzerland: N. p., 1999. Web.
Huebner, G, Roduner, E, Brack, H P, & Scherer, G G. ESR spectroscopic investigations of the radiation-grafting of fluoropolymers. Switzerland.
Huebner, G, Roduner, E, Brack, H P, and Scherer, G G. 1999. "ESR spectroscopic investigations of the radiation-grafting of fluoropolymers." Switzerland.
@misc{etde_685675,
title = {ESR spectroscopic investigations of the radiation-grafting of fluoropolymers}
author = {Huebner, G, Roduner, E, Brack, H P, and Scherer, G G}
abstractNote = {ESR spectroscopic investigations have clarified the influence of several preparative parameters on the reaction rates and yields obtained in the radiation-grafting method used at PSI to prepare proton-conducting polymer membranes. At a given irradiation dose, a higher concentration of reactive radical sites was detected in ETFE films than in FEP films. This higher concentration explains the higher grafting levels and rates of the ETFE films found in our previous grafting experiments. Taken together, the in-situ ESR experiments and grafting experiments show that the rates of disappearance of radical species and grafting rates and final grafting levels depend strongly on the reaction temperature and the oxygen content of the system. Average grafted chain lengths were calculated to contain about 1,000 monomer units. (author) 2 figs., 4 refs.}
place = {Switzerland}
year = {1999}
month = {Aug}
}