Pile Irradiation of Polyethylene Terephthalate (‘Terylene’)

Todd, Audrey

doi:10.1038/174613a0

Cited by 22 publications

(3 citation statements)

References 3 publications

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“…The radiation-induced degradation of vinyl polymers containing quaternary carbon atoms is therefore postulated to take place by the following scheme, which is described for polymethyl methacrylate. The free radical (I), formed by the rupture of a secondary hydrogen atom is, as has been pointed out by Slovokhotova and Karp0v,4~ too sterically encumbered to combine with another of its kind, and so it decomposes to give the unsaturated polymer chain end (11)) and another polymer free radical (111). Reaction (1) is considered to be unlikely in the solid state, as it requires two polymer radicals to approach end-on: radical (111) is unlikely to exist long enough for this to happen.…”

Section: Ri R1mentioning

confidence: 97%

The mechanisms of radiation‐induced changes in vinyl polymers

Todd

1960

J. Polym. Sci.

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100

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Methyl methacrylate, labeled with 14C on the ester methyl group, was prepared by the ester interchange method of Blackley and Mel~il1e.I~ A small highly active sample of 14C-labeled methanol, containing 500 pc., was obtained from the Radio-Chemical Centre, Amersham, in a Pyrex "breakseal" tube. This was diluted to 10 ml. (sufficient for the preparation of both active l4C-methyl methacrylate and l4C-methyl acrylate) with dry, degassed methanol on a high vacuum line. Here, 5.2 ml. of this 14Cmethanol was used to prepare 45 ml. of l4C-methyl methacrylate, which would have a specific activity of about 4.8 pc./g. if equilibrium was assumed to have been reached in the ester-interchange reaction.Polymerization of the pure monomers was carried out in Pyrex dilatometers of about 40 ml. capacity after thorough degassing under high vacuum, and the rates were followed to ensure that they were normal. Suit- Activity MeasurementsRadioactive assay of 14Glabeled polymers was carried out by Dr. J. C . Bevington by the gas-counting technique development by Bevington et al. 3 1Repeat activity measurements were made by dilution of the carbon dioxide from duplicate combustions of each polymer sample.

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Section: Ri R1mentioning

confidence: 97%

The mechanisms of radiation‐induced changes in vinyl polymers

Todd

1960

J. Polym. Sci.

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100

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“…Nylon yields hydrogen on irradiation, and groups of atoms are broken off the chains; the degree of crystallinity changes, and a methyl-substituted nylon is apparently formed (387). With polyethylene terephthalate breakdown of the chains is again indicated, and there may be some branching, but there is no evolution of hydrogen or formation of low-molecular-weight materials (387,606). All these results are at variance with an earlier claim that both nylon and "Terylene" were cross-linked by irradiation (125), but this may be because cross-linking can only be observed with a comparatively low total dose.…”

Section: B Other Types Of Polymermentioning

confidence: 99%

The Radiation Chemistry Of Organic Substances

Collinson¹,

Swallow²

1956

Chem. Rev.

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“…Charlesby has shown that the energy to produce a cross-link is the same for Pz-paraffins between C,H,, C,6H,, as for polyethylene with a chain length of ZOO0. 461 Other polymers which have been studied in any detail are poly(methy1 methacrylate) ,462 poly(ethy1ene terephthalate) ,4631 464 and cellu-10se,*~5 all of which are predominantly degraded, and rubber 466 and siloxanes 467 which are predominantly cross-linked.…”

Section: Radiation +Ozymerisatioizmentioning

confidence: 99%