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Authors
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Hill, D.J.T. ; Mohajerani, S. ; Whittaker, A.K. ; Scheler, U.
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Title
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Chain scission and branching in irradiated poly(tetrafluoroethylene-co-hexafluoropropylene)
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Date
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31.12.2003
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Number
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11599
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Abstract
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The radiation chemistry of poly(tetrafluoroethylene-<I>co</I>-hexafluoropropylene) (FEP) with a TFE mole fraction of 0.90 has been studied under vacuum using <SUP>60</SUP>Co <IMGSRC="/giflibrary/12/gamma.gif"BORDER="0">-radiation over a range of temperatures and absorbed doses. The radiolysis temperatures were 300, 363, 423, 523 and 543 K. New structure formation in the copolymers was analysed by solid-state <SUP>19</SUP>F NMR spectroscopy. The new structures formed in the copolymers have been identified and the <I>G</I>-values for the formation of new chemical structures have been investigated at 363 and 523 K. These two temperatures are just above and just below the polymer <I>T</I><SUB>g</SUB> and <I>T</I><SUB>m</SUB>, respectively. At the lower temperature, there was no evidence for any chain branching and an estimate of <I>G</I>(S) of 1.0 was obtained. A value of <I>G</I>(S) of 1.3 and a minimum value of <I>G</I>(X)<SUB>Y</SUB> of 1.3 were obtained at 523 K. Copyright © 2003 Society of Chemical Industry
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Publisher
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Polymer International
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Wikidata
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Citation
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Polymer International 52 (2003) 1725-1733
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DOI
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https://doi.org/10.1002/pi.1299
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Tags
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