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Authors
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Dargaville, T.R. ; George, G.A. ; Hill, D.J.T. ; Scheler, U. ; Whittaker, A.K.
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Title
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Cross-Linking of PFA by Electron Beam Irradiation
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Date
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06.10.2003
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Number
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11598
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Abstract
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The effect of electron beam radiation on a perfluoroalkoxy (PFA) resin was examined usingsolid-state high-speed magic angle spinning <SUP>19</SUP>F NMR spectroscopy and FT-IR spectroscopy. Samples wereprepared for analysis by subjecting them to electron beam radiation in the dose range 0.5-2.0 MGy at633 K, which is above the crystalline melting temperature. The new structures were identified and includenew saturated chain ends, short and long branches, unsaturated groups, and cross-links. The radiationchemical yield (<I>G</I> value) of new long branch points was greater than the <I>G</I> value of new chain ends,suggesting that cross-linking is the net radiolytic process. This conclusion was supported by an observeddecrease in the crystallinity and an increase in the optical clarity of the polymer.
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Publisher
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Macromolecules
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Wikidata
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Citation
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Macromolecules 36 (2003) 7138-7142
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DOI
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https://doi.org/10.1021/ma0302356
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Tags
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