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230000015556 catabolic process Effects 0.000 abstract description 25.230000003100 immobilizing Effects 0.000 claims description 3.230000005284 excitation Effects 0.000 claims description 4.239000000919 ceramic Substances 0.000 claims description 5.230000003534 oscillatory Effects 0.000 claims description 7.238000006243 chemical reaction Methods 0.000 claims description 7.239000002861 polymer material Substances 0.000 claims description 18.238000006073 displacement reaction Methods 0.000 claims description 45.238000007373 indentation Methods 0.000 claims abstract description 42.
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239000000463 materials Substances 0.000 claims abstract description 63.229920000642 polymer Polymers 0.000 title claims abstract description 75.Assignors: CISSE, LADJI, BOOR, RICHARD, GUEROUT, FABRICE Publication of US20120085155A1 publication Critical patent/US20120085155A1/en Publication of US8857246B2 publication Critical patent/US8857246B2/en Application granted granted Critical Status Active legal-status Critical Current Adjusted expiration legal-status Critical Links Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US11488908P priority Critical Application filed by Atomic Energy of Canada Ltd AECL filed Critical Atomic Energy of Canada Ltd AECL Priority to PCT/CA2009/001654 priority patent/WO2010054486A1/en Priority to US13/129,196 priority patent/US8857246B2/en Assigned to ATOMIC ENERGY OF CANADA LIMITED reassignment ATOMIC ENERGY OF CANADA LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Original Assignee Atomic Energy of Canada Ltd AECL Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) ( en Inventor Fabrice Guerout Ladjl Cisse Richard Boor Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Active, expires Application number US13/129,196 Other versions US20120085155A1
IAEA TECDOC 1188 PDF
The role of the antioxidant in the polymer is the reduction of free radical formation in the initiation step in thermal oxidation, and it could not stop radical reactions for either radiation or thermal oxidation.- Google Patents US8857246B2 - Portable polymer testerĭownload PDF Info Publication number US8857246B2 US8857246B2 US13/129,196 US200913129196A US8857246B2 US 8857246 B2 US8857246 B2 US 8857246B2 US 200913129196 A US200913129196 A US 200913129196A US 8857246 B2 US8857246 B2 US 8857246B2 Authority US United States Prior art keywords probe polymer testing force displacement Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. A new model of polymer degradation mechanisms was proposed where the degradation does not take place by chain reaction via peroxy radical and hydro-peroxide. The changes in mechanical properties were well reflected by the degree of oxidation. The analysis of antioxidant content and oxidative products in XLPE as a model sample showed that a small amount of antioxidant significantly reduced the extent of thermal oxidation, but was not effective for radiation induced oxidation. This may be attributed to the fact that the content of an antioxidant used as the stabilizer for polymers decreases by evaporation during thermal ageing at high temperatures.
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The activation energy of thermal oxidative degradation changed over the range 100–120 ☌ for both EPR and XLPE. Radiation and thermal degradation of ethylene–propylene rubber (EPR) and crosslinked polyethylene (XLPE) as cable insulation materials were investigated by evaluating tensile properties, gel-fraction, and swelling ratio, as well as by the infrared (FTIR) analysis.