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Title: Polybutadiene and Styrene-Butadiene rubbers for high-dose dosimetry

Abstract

Polybutadiene and Styrene-Butadiene are synthetical rubbers used widely for pneumatic tires manufacturing. In this research, the dosimeter characteristics of those rubbers were studied for application in high-dose dosimetry. The rubber samples were irradiated with doses of 10 Gy up to 10 kGy, using a {sup 60}Co Gamma Cell-220 system (dose rate of 1.089 kGy/h) and their readings were taken on a Fourier Transform Infrared Spectroscopy-FTIR system (model Frontier/Perkin Elmer). The ratios of two absorbance peaks were taken for each kind of rubber spectrum, Polybutadiene (1306/1130 cm{sup -1}) and Styrene-Butadiene (1449/1306 cm{sup -1}). The ratio calculated was used as the response to the irradiation, and is not uniform across the sample. From the results, it can be concluded for both rubbers: a) the dose-response curves may be useful for high-dose dosimetry (greater than 250 Gy); b) their response for reproducibility presented standard deviations lower than 2.5%; c) the relative sensitivity was higher for Styrene-Butadiene (1.86 kGy{sup -1}) than for Polybutadiene (1.81 kGy{sup -1}), d) for doses of 10 kGy to 200 kGy, there was no variation in the dosimetric response. Both types of rubber samples showed usefulness as high-dose dosimeters. (authors)

Authors:
 [1];  [2];  [3];  [4]; ;  [5]
  1. Instituto Federal de Educacao, Ciencia e Tecnologia de Goias-IFG,Campus Goiania, Goiania -GO (Brazil)
  2. (Brazil)
  3. Instituto de Fisica, Universidade Federal de Goias-UFG, Campus Samambaia, Goiania-GO (Brazil)
  4. Instituto Federal de Educacao, Ciencia e Tecnologia de Goias-IFG,Campus Inhumas, Inhumas-GO (Brazil)
  5. Instituto de Pesquisas Energeticas e Nucleares -IPEN, Sao Paulo-SP (Brazil)
Publication Date:
Research Org.:
Institute of Electrical and Electronics Engineers - IEEE, 3 Park Avenue, 17th Floor, New York, N.Y. 10016-5997 (United States)
OSTI Identifier:
22531288
Report Number(s):
ANIMMA-2015-IO-238
TRN: US16V0466102229
Resource Type:
Conference
Resource Relation:
Conference: ANIMMA 2015: 4. International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, Lisboa (Portugal), 20-24 Apr 2015; Other Information: Country of input: France; 12 refs.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 61 RADIATION PROTECTION AND DOSIMETRY; BUTADIENE; COBALT 60; DIAGRAMS; DOSE RATES; DOSEMETERS; DOSIMETRY; FOURIER TRANSFORM SPECTROMETERS; FOURIER TRANSFORMATION; INFRARED SPECTRA; IRRADIATION; RUBBERS; SENSITIVITY; STYRENE; VARIATIONS

Citation Formats

Oliveira, Lucas N., Instituto de Pesquisas Energeticas e Nucleares -IPEN, Sao Paulo-SP, Vieira, Silvio L., Schimidt, Fernando, Antonio, Patricia L., and Caldas, Linda V.E. Polybutadiene and Styrene-Butadiene rubbers for high-dose dosimetry. United States: N. p., 2015. Web. doi:10.1109/ANIMMA.2015.7465588.
Oliveira, Lucas N., Instituto de Pesquisas Energeticas e Nucleares -IPEN, Sao Paulo-SP, Vieira, Silvio L., Schimidt, Fernando, Antonio, Patricia L., & Caldas, Linda V.E. Polybutadiene and Styrene-Butadiene rubbers for high-dose dosimetry. United States. doi:10.1109/ANIMMA.2015.7465588.
Oliveira, Lucas N., Instituto de Pesquisas Energeticas e Nucleares -IPEN, Sao Paulo-SP, Vieira, Silvio L., Schimidt, Fernando, Antonio, Patricia L., and Caldas, Linda V.E. Wed . "Polybutadiene and Styrene-Butadiene rubbers for high-dose dosimetry". United States. doi:10.1109/ANIMMA.2015.7465588.
@article{osti_22531288,
title = {Polybutadiene and Styrene-Butadiene rubbers for high-dose dosimetry},
author = {Oliveira, Lucas N. and Instituto de Pesquisas Energeticas e Nucleares -IPEN, Sao Paulo-SP and Vieira, Silvio L. and Schimidt, Fernando and Antonio, Patricia L. and Caldas, Linda V.E.},
abstractNote = {Polybutadiene and Styrene-Butadiene are synthetical rubbers used widely for pneumatic tires manufacturing. In this research, the dosimeter characteristics of those rubbers were studied for application in high-dose dosimetry. The rubber samples were irradiated with doses of 10 Gy up to 10 kGy, using a {sup 60}Co Gamma Cell-220 system (dose rate of 1.089 kGy/h) and their readings were taken on a Fourier Transform Infrared Spectroscopy-FTIR system (model Frontier/Perkin Elmer). The ratios of two absorbance peaks were taken for each kind of rubber spectrum, Polybutadiene (1306/1130 cm{sup -1}) and Styrene-Butadiene (1449/1306 cm{sup -1}). The ratio calculated was used as the response to the irradiation, and is not uniform across the sample. From the results, it can be concluded for both rubbers: a) the dose-response curves may be useful for high-dose dosimetry (greater than 250 Gy); b) their response for reproducibility presented standard deviations lower than 2.5%; c) the relative sensitivity was higher for Styrene-Butadiene (1.86 kGy{sup -1}) than for Polybutadiene (1.81 kGy{sup -1}), d) for doses of 10 kGy to 200 kGy, there was no variation in the dosimetric response. Both types of rubber samples showed usefulness as high-dose dosimeters. (authors)},
doi = {10.1109/ANIMMA.2015.7465588},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jul 01 00:00:00 EDT 2015},
month = {Wed Jul 01 00:00:00 EDT 2015}
}

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  • Experimental results, together with an analytical model, related to the loss in tensile strength of styrene-butadiene rubber (SBR) loaded with carbon black (CB) that had been subjected to low-cycle, high-stress fatigue tests were presented in a prior paper. The drop in tensile strength relative to that of a virgin sample was considered to be a measure of damage induced during the fatigue test. The present paper is a continuation of this study dealing with the morphological interpretations of the fractured surfaces, whereby the cyclic-tearing behavior, resulting in the damage, is related to the test and material parameters. It was foundmore » that failure is almost always initiated in the bulk of a sample at a material flaw. The size and definition of a flaw increase with an increase in carbon-black loading. Initiation flaw sites are enveloped by fan-shaped or penny-shaped regions which develop during cycling. The size and morphology of a fatigue-tear region appears to be independent of the fatigue load or the extent of the damage (strength loss). By contrast, either an increase in cycling load or an increase in damage at constant load increases the definition of the fatigue-region morphology for all formulations of carbon-black. On the finest scale, the morphology can be described in terms of tearing of individual groups of rubber strands, collapsing to form a cell-like structure. 18 refs., 13 figs.« less
  • Electron spin resonance (ESR) of the free radical structure resulting from high energy gamma LNT irradiation of the polymers revealed the presence of allylic free radicals of the type approx. CH.CH = CH.CH/sub 2/ approx. The presence of chemically trapped electrons in polybutadiene and styrene-butadiene (SB) block copolymers irradiated in the absence of light at LNT was determined by ESR measurements, and the trapping sites were shown to be impurities or additive molecules which were imbedded in between the polymer chains and which had not been completely removed by purification. Reaction kinetic studies of free radical decay indicated that themore » decay followed the equation derived for the case in which some free radicals decay by a second order mechanism in the presence of nondecaying free radicals. The same reaction scheme was found to describe the kinetics of alkyl free radical decay in LNT irradiated quenched and annealed isotactic polypropylene with the decay rate of quenched samples being higher than for annealed samples. Results of studies of radiation-induced crosslinking of the elastomers are also included. (BLM)« less