Radiation chemistry of polymers

Hill, David J. T. and Whittaker, Andrew K. (2016). Radiation chemistry of polymers. In Herman F. Mark (Ed.), Encyclopaedia of polymer science and technology 4th ed. (pp. *-*) (online): John Wiley & Sons. doi:10.1002/0471440264.pst488.pub2


Author Hill, David J. T.
Whittaker, Andrew K.
Title of chapter Radiation chemistry of polymers
Title of book Encyclopaedia of polymer science and technology
Place of Publication (online)
Publisher John Wiley & Sons
Publication Year 2016
Sub-type Chapter in reference work, encyclopaedia, manual or handbook
DOI 10.1002/0471440264.pst488.pub2
Open Access Status Not yet assessed
Edition 4th
ISBN 9781118633892
Editor Herman F. Mark
Start page *
End page *
Language eng
Abstract/Summary olymeric materials are exposed to high energy radiation either deliberately to alter their properties or inadvertently during their use in high dose environments. As a consequence, an understanding of how radiation modifies polymer structure, and hence properties, is essential for many applications. In addition, the understanding of the degradation of polymers with light or heat can benefit from knowledge of the reaction pathways of radical and charged species formed on irradiation with high energy photons. This article aims to provide a broad overview of the fundamental processes occurring during radiolysis of polymers. This is achieved through a discussion of the interaction of high energy photons with matter, and the subsequent reactions of mainly radical intermediates. Polymers either cross-link or degrade on exposure to radiation, and the final properties of the polymers depend critically on the balance of these main reaction pathways. Examples are taken from the literature to illustrate how the tendency to undergo cross-linking or main-chain scission depends on the polymer structure. The overall yield of reactions can be greatly reduced by the introduction of aromatic groups into the polymer structure. On the other hand, yields can be increased by the inclusion of radiation-sensitive groups such as sulfones. Similarly, the rates of reactions and the balance between cross-linking and scission can depend sensitively on the radiolysis temperature. While this review focuses on a discussion of the reactions occurring on radiolysis in vacuo, the effect of the presence of dissolved oxygen on the reaction pathways is also briefly addressed.
Keyword Radiation degradation
Cross-linking
Gelation
Formation of unsaturation
Volatile products
Q-Index Code BX
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 08 Mar 2017, 11:12:17 EST by Chris Ende on behalf of Aust Institute for Bioengineering & Nanotechnology