Reactivity of free radical intermediates that form spontaneously during molecular chlorine action on acetylene and vinyl monomers at low temperatures
In this study ESR, UV, VIS and IR spectroscopy, chromatography, calorimetry, and elemental analysis were employed to show the spontaneous formation of free radicals under low-temperature action of molecular chlorine on acetylene monomer p-diethynylbenzene, and vinyl monomer acrylamide. These radic...
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| Datum: | 2013 |
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| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | English |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2013
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| Schriftenreihe: | Физика низких температур |
| Schlagworte: | |
| Online Zugang: | http://dspace.nbuv.gov.ua/handle/123456789/118476 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Reactivity of free radical intermediates that form spontaneously during molecular chlorine action on acetylene and vinyl monomers at low temperatures / D.A. Gordon, V.A. Volodina, A.I. Mikhailov // Физика низких температур. — 2013. — Т. 39, № 6. — С. 726–733. — Бібліогр.: 25 назв. — англ. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Zusammenfassung: | In this study ESR, UV, VIS and IR spectroscopy, chromatography, calorimetry, and elemental analysis were
employed to show the spontaneous formation of free radicals under low-temperature action of molecular chlorine
on acetylene monomer p-diethynylbenzene, and vinyl monomer acrylamide. These radicals are able to initiate
chain reaction of polymerization of monomers at low temperatures. This reaction results in a completely
soluble polymer with a yield of 25 %, while an insoluble cross-linked polymer has been obtained during polymerization
of p-diethynylbenzene initiated by other means. For example, under radiolysis by 1000 kGy the soluble
fraction of obtained polymer was ≈ 1% while the overall yield was ≈ 10%. p-Diethynylbenzene polymerizes at
temperatures close to chlorine melting (170 K). Polymerization of acrylamide takes place in the temperature
range of 180–210 K with an yield of polymer ≈ 10%. The low-temperature chlorination of a 20%-solution of
acrylamide in glycerol enables a twofold increase of the polymer yield, and a tenfold decrease of the chlorine
content in it. |
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