EPR studies on regio-selective H-abstraction by “magic blue” reagent from polymers |
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Authors: | Hong-Bo Ni |
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Affiliation: | College of Chemistry and Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, China |
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Abstract: | The radical reactions of polyolefin and olefin copolymers (4-9), polydienes and diene coplymers (10-15), and polysiloxane (16) with “magic blue” reagent containing H-abstracting agent-bis{perfluoro-1-[1-(2-fluorosulfonyl)ethoxy]ethyl}nitroxide [FSO2CF2CF2OCF(CF3)]2N(O) (2)and spin trap-perfluoro-1-nitroso-[1-(2-fluoro-sulfonyl)ethoxy]ethane FSO2CF2CF2OCF(CF3)NO (3) were studied by EPR detection of the spin adducts of the corresponding polymeric radicals generated in the H-abstraction step to the spin trap 3, namely, the nitroxides FSO2CF2CF2OCF(CF3)N(O) (polymer-H) 17-29. EPR studies have provided information about the regio-selectivity of H-abstraction, the subsequent radical steps followed H-abstraction and grounded a possibility of employing “magic blue” reagent in polymer modification via H-abstraction-initiated grafting polymerization. |
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Keywords: | Polyolefin Olefin copolymer Polydiene Diene copolymer Polysiloxane Magic blue reagent Hydrogen abstraction Spin trapping |
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