Ionizing radiation on polymers

The degradation effects of ionizing radiation on polymers can be classified from the point of view of the targeted practical applications ... 

Figure 2.3 Impact of ionizing radiation on polymers. (A) Simplified scheme of radiation-induced events in polymers. (B and C) Comparison of the interaction of VVphotons and electrons with polymers. Photon beams are exponentially attenuated along the beam direction, whereas electrons are scattered and slowed down along their path through the polymer fdm. Source Adapted from Drobny [2], with permission from Elsevier Ltd.

T. S. Nikitina, E. V. Zhuravskaya, and A. S. Kuz minskii, The Action of Ionizing Radiations on Polymers, Moscow, State Press for Chemical Literature, 1959. 

In the EPR loaded with amine type antioxidants, free radicals produced by ionizing radiation on polymer interact with antioxidant with R-NO stable radical formation [55]. The oxidation products increase with decreasing dose rates due to the increased time for oxygen diffusion. 

Smirnova and coworkers studied the influence of various types of ionizing radiations on the physiomechanical characteristics of a statistical polymer of butadiene and acrylonitrile137. Although the polymer is a statistical polymer, the nature of its thermo-mechanical curve indicates a block nature of the polymeric basis of the rubber there is a... 

This review has looked at the direct effects of ionizing radiation on nucleic acids. The first step was to review detailed EPR/ENDOR experiments on irradiated model compounds at low temperatures in order to study the primary radiation-induced defects. Next, it was shown how these EPR spectra are used to simulate the EPR spectra of the DNA polymer. 

Bovey, F. A., Effects of Ionizing Radiation on Natural and Synthetic High Polymers, Interscience, New York, 1958. 

Tphis paper is concerned with the effect of ionizing radiation on the physical and mechanical properties of copolymers of ethylene with alkyl acrylates, such as ethyl acrylate, butyl acrylate, and 2-ethvlhexyl acrylate (J, 2, 3). These polymers are made by the free radical copolymerization of ethylene under high pressure with alkyl esters of acrylic acid (9). They are more flexible than polyethylene and because of the polar nature of the comonomer, they are more compatible with fillers and with other polymers than is polyethylene. 

Radiation-Induced Crosslinking. In the absence of oxygen, the predominant effect of ionizing radiation on UHMWPE is crosslinking (27). Crosslinking of UHMWPE forms covalent bonds between the polymer chains, which inhibit cold flow or creep of the individual polymer chains. 

DZIEWINSKI, J., ZAGORSKI, Z.P., Radiation chemistry of polymeric components of radioactive waste , 5th International Symposium on Ionizing Radiation and Polymers, Sainte-Adele (Quebec) Canada, Sept. 21-26, 2002. Abstract P-161, 183. 

A considerable amount of work has been devoted to the action of ionizing radiation on polymeric carbohydrates in the solid state, in particular with regard to its effect on the mechanical properties even though some chemical effects have also emerged. For a recent review see [99]. Of these polymers, cellulose has been the most studied (c/. [99, 100]). Native cellulose is locally crystalline. Determination of chain breakage by radiolysis has usually been done after dissolution through complexation, e.g. as the copper-ammine complex (Schweizer s reagent), or the cadmium-ethylenediamine complex. 

F. Bovey, The effects of ionizing radiation on natural and synthetic polymers "Interscience Press, New Yor)c, 1958... 

R L Clough, K T Gillen and M Dole, Radiation resistance of polymers and composites , in The Effects of Ionizing Radiations on Polymeric Materials, eds A A Collyer and D W Clegg, Amsterdam, Elsevier, 1990. 

EFFECTS OF IONIZING RADIATION ON THE THERMAL PROPERTIES OF LINEAR HIGH POLYMERS. 5. ETHYLENE-ISOTACTIC PROPYLENE BLOCK COPOLYMER. 

Wertheimer MR, Ionizing radiation and polymers. Proceedings of the 5th international symposium on ionizing radiation and polymers (IRAP 2002) , Sainte-Adele, Quebec, Canada, 21-26 September 2002, Ed., Elsevier, 2002, p512. 

Felten,A.,Gamby,S.,Bittencourt,C.,Brison,J.,Houssiau, L., Pireaux, J.J. (2004) Communication at the 6th International Symposium on Ionizing Radiation and Polymers, HouffaUze, Belgium, September 2004. 

F. Bovei, The Action of Ionizing Radiations on Natural and S5mthetic Polymers [Russian Translation], Moscow, Foreign Literature Press,... 

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