Solid state F-19 NMR determination of new structure formation in FEP following radiolysis at 300 and 363 K
Data(s) |
01/01/2001
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Resumo |
The radiation chemistry of FEP copolymer with a mole fraction TFE of 0.90 has been studied using Co-60 gamma -radiation at temperatures of 300 and 363 K. New structure formation in the copolymers was analysed by solid state F-19 NMR. New chain scission products were the principal new structures found. The G-value for the formation of new -CF3 groups was 2.2 and 2.1 for the radiolysis of FEP at 300 and 363 K, respectively, and the G-value for the loss of original -CF3 groups was G(-CF3) = 1.0 and 0.9 at these two temperatures, respectively. There was a nett loss of -CF- groups on irradiation, with G(-CF) of 1.3 and 0.9 at 300 and 363 K, respectively. (C) 2001 Elsevier Science Ltd. All rights reserved. |
Identificador | |
Idioma(s) |
eng |
Publicador |
Pergamon |
Palavras-Chave | #Chemistry, Physical #Nuclear Science & Technology #Physics, Atomic, Molecular & Chemical #Poly(tetrafluoroethylene-co-perfluoropropylene) #Fep #Gamma Radiolysis #New Structures #Nmr Analysis #G-values #Induced Cross-linking #Speed Mas-nmr #Polytetrafluoroethylene Ptfe #Radiation Stability #Fluoropolymers #Improvement #Polymers #C1 #250599 Macromolecular Chemistry not elsewhere classified #780103 Chemical sciences |
Tipo |
Journal Article |