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Electron beam irradiation of fluoropolymers containing polyethers

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Title: Electron beam irradiation of fluoropolymers containing polyethers
Authors: Bucio, E.1, Burillo, G.1 burillo@nucleares.unam.mx, Tapia, F.1, Adem, E.2, Cedillo, G.3, Cassidy, P.E.4
Source: Radiation Physics & Chemistry. Feb2009, Vol. 78 Issue 2, p119-123. 5p.
Subjects: Electron beams, Irradiation, Fluoropolymers, Polyethers, Radiochemistry, Polycondensation
Abstract: Abstract: A highly fluorinated monomer, 1,3-bis(1,1,1,3,3,3-hexafluoro-2-pentafluorophenyl methoxy-2-propyl)benzene (12F-FBE) was polymerized with some diphenols by polycondensation and then was electron beam irradiated between 100 and 1000kGy to determine degradation radiochemistry yield (G s) by gel permeation chromatography (GPC). The samples were characterized after irradiation by DSC, FTIR, and nuclear magnetic resonance (NMR). The fluoropolymers show apparent degradation in mechanical properties at 300kGy, except 12F-FBE polymerized with biphenol and bisphenol A, when they did not show any apparent physical change up to 300kGy; and continue to be flexible and transparent, with a radiochemical yield scission (G s) of 0.75, 0.53, 0.88, and 0.38 for 12F-FBE/SDL aliphatic, 12F-FBE/biphenol, 12F-FBE/bisphenol A, and 12F-FBE/bisphenol O, respectively. The number average molecular weights for three of the polymers decrease upon 1000kGy irradiation to 10% of their original values; however, the polymer from bisphenol A is much more stable and its M n decreases to only 24% of original. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: A highly fluorinated monomer, 1,3-bis(1,1,1,3,3,3-hexafluoro-2-pentafluorophenyl methoxy-2-propyl)benzene (12F-FBE) was polymerized with some diphenols by polycondensation and then was electron beam irradiated between 100 and 1000kGy to determine degradation radiochemistry yield (G s) by gel permeation chromatography (GPC). The samples were characterized after irradiation by DSC, FTIR, and nuclear magnetic resonance (NMR). The fluoropolymers show apparent degradation in mechanical properties at 300kGy, except 12F-FBE polymerized with biphenol and bisphenol A, when they did not show any apparent physical change up to 300kGy; and continue to be flexible and transparent, with a radiochemical yield scission (G s) of 0.75, 0.53, 0.88, and 0.38 for 12F-FBE/SDL aliphatic, 12F-FBE/biphenol, 12F-FBE/bisphenol A, and 12F-FBE/bisphenol O, respectively. The number average molecular weights for three of the polymers decrease upon 1000kGy irradiation to 10% of their original values; however, the polymer from bisphenol A is much more stable and its M n decreases to only 24% of original. [Copyright &y& Elsevier]
ISSN:0969806X
DOI:10.1016/j.radphyschem.2008.08.004