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 acrylam...

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Published in:Физика низких температур
Date:2013
Main Authors: Gordon, D.A., Volodina, V.A., Mikhailov, A.I.
Format: Article
Language:English
Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2013
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Online Access:https://nasplib.isofts.kiev.ua/handle/123456789/118476
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Journal Title:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Cite this: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.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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Summary: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.
ISSN:0132-6414