The influence of low- and high-linear energy transfers on some physical properties of poly(methyl-methacrylate) samples

Clear poly(methyl‐methacrylate)—PMMA—dosimeter is widely used in food irradiations. Positron annihilation lifetime spectroscopy (PALS) is one of the unique tools used for studying free‐volumes and open‐volume type defects in solid media. The Vicker's microhardness measurements offer a simple an...

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Bibliographic Details
Published in:Journal of applied polymer science 2012-09, Vol.125 (5), p.3682-3687
Main Authors: Eissa, Mostafa F., Kaid, Maysa A., Kamel, Nasser A.
Format: Article
Language:English
Subjects:
alpha particles fluences
Alpha rays
Applied sciences
Bacteria
Energy transfer
Exact sciences and technology
gamma ray doses
Irradiation
Materials science
Microhardness
microhardness test
optical characteristics
Physical properties
poly(methyl-methacrylate)
Polymer industry, paints, wood
Polymers
Polymethyl methacrylates
Positron annihilation
Positron annihilation lifetime spectroscopy
Properties and testing
Radiation influence
Reproduction
structural studies
Technology of polymers
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Summary:Clear poly(methyl‐methacrylate)—PMMA—dosimeter is widely used in food irradiations. Positron annihilation lifetime spectroscopy (PALS) is one of the unique tools used for studying free‐volumes and open‐volume type defects in solid media. The Vicker's microhardness measurements offer a simple and nondestructive tool for investigating the mechanical behavior of polymer materials. PALS as well as microhardness measurements were carried out for PMMA samples, irradiated with low‐ and high‐linear energy transfers (LET). The low‐LET irradiations were provided at lethal doses of gamma radiations for vegetative bacteria. Such irradiations showed a chain scission in the PMMA samples. High‐LET irradiations showed behavior different from the low‐LET ones. The observed behavior depends on the alpha particle fluence. The microhardness testing was carried out for virgin and irradiated PMMA samples at high‐LET. A negative correlation was found between PALS measurements and microhardness results. The optical characteristics and structural studies for the virgin and irradiated PMMA samples were in agreement with the PALS and microhardness measurements. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
ISSN:0021-8995
1097-4628
DOI:10.1002/app.36695