Effect of gamma irradiation on molecular weight of fluorinated aromatic polyethers
| Autor: | Angel Contreras-García, Patrick E. Cassidy, Gerardo Cedillo, Emilio Bucio, C. J. Booth, L. I. Olvera |
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| Rok vydání: | 2009 |
| Předmět: |
chemistry.chemical_classification
Bisphenol A Bisphenol Health Toxicology and Mutagenesis Public Health Environmental and Occupational Health Polymer Pollution Bisphenol AF Analytical Chemistry chemistry.chemical_compound Monomer Nuclear Energy and Engineering chemistry Yield (chemistry) Polymer chemistry Fluoropolymer Radiology Nuclear Medicine and imaging Irradiation Spectroscopy Nuclear chemistry |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 284:109-115 |
| ISSN: | 1588-2780 0236-5731 |
| DOI: | 10.1007/s10967-009-0436-5 |
| Popis: | A series of fluoropolymer films was synthe- sized by reacting 1,3-bis(1,1,1,3,3,3-hexafluoro-2-penta- fluorophenylmethoxy-2-propyl)benzene (12F-FBE) with a series of bisphenol monomers via a polycondensation reaction. The biphenols used included a diphenol-substi- tuted spirodilactam, biphenol, bisphenol A, bisphenol AF, bisphenol F and bisphenol O. Polymers films from these new fluoropolyaryl ethers were irradiated by a Gamma Beam 657-PT at a dose rate of 9 kGy/h; the absorbed dose was varied between 30 and 150 kGy. The effect on the chemical structure upon radiation was studied by DSC, TGA, FTIR-ATR, NMR, and GPC, both before and after irradiation. The data obtained allowed the determination of the degradation radiochemical yield (Gs), between 0.24 and 7.43 crosslinking radiochemical yield (Gx), from 0.03 to 1.47 and the ratio of Gs/Gx was between 2.89 and 8.28. There was no apparent physical change, from 30 to 150 kGy; the films continue to be flexible and transparent after irradiation. |
| Databáze: | OpenAIRE |
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