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On the nature of ma...
On the nature of macroradicals formed upon radiolysis of aqueous poly(N-vinylpyrrolidone) solutions
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Dispenza, C. (author)
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Sabatino, M. A. (author)
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Grimaldi, N. (author)
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- Dahlgren, Björn (author)
- KTH,Kemi
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Al-Sheikhly, M. (author)
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Wishart, J. F. (author)
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Tsinas, Z. (author)
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Poster, D. L. (author)
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- Jonsson, Mats, 1967- (author)
- KTH,Tillämpad fysikalisk kemi
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(creator_code:org_t)
- Elsevier, 2020
- 2020
- English.
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In: Radiation Physics and Chemistry. - : Elsevier. - 0969-806X .- 1879-0895. ; 174
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https://www.scienced...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- In this work we have explored the nature of macroradicals formed upon radiolysis of aqueous poly(N-vinylpyrrolidone) (PVP) solutions using pulse radiolysis, density functional theory (DFT) and literature data. On the basis of literature data on site-specific kinetics of hydrogen abstraction from simple amides and spectra corresponding to specific radical sites on the same amides we have assessed the distribution of H-atom abstraction by •OH radicals from different positions on the pyrrolidone ring and the polymer backbone. Pulse radiolysis experiments performed at different doses per pulse and different PVP concentrations demonstrate that the H-abstracting radiolysis products are not quantitatively scavenged by the polymer when the dose per pulse exceeds ≈40 Gy. The implications of this are discussed in the context of radical-initiated crosslinking reactions. At a mass fraction of 0.1% PVP and doses per pulse ranging from 7 Gy to 117 Gy, the overall radical decay observed at 390 nm follows second order kinetics with rate constants on the order of 109 dm3 mol-1 s-1.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Density functional theory
- Macroradicals
- Nanogels
- poly(N-vinyl pyrrolidone)
- Pulse radiolysis
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Dispenza, C.
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Sabatino, M. A.
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Grimaldi, N.
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Dahlgren, Björn
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Al-Sheikhly, M.
-
Wishart, J. F.
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show more...
-
Tsinas, Z.
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Poster, D. L.
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Jonsson, Mats, 1 ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
- Articles in the publication
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Radiation Physic ...
- By the university
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Royal Institute of Technology