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Free Radical Copolymerisation of N ‐Methylmaleimide and 2,3‐Dihydrofuran Initiated by their Radical Cations. A Low Temperature EPR Study of a Binary System
Author(s) -
von Sonntag Justus,
Janovský Igor,
Naumov Sergej,
Mehnert Reiner
Publication year - 2002
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20020201)203:3<580::aid-macp580>3.0.co;2-5
Subject(s) - chemistry , electron paramagnetic resonance , radical , radical ion , photochemistry , monomer , radical initiator , polymer chemistry , organic chemistry , polymer , ion , nuclear magnetic resonance , physics
2,3‐Dihydrofuran radical cations were generated at 77 K by electron beam irradiation of a freon matrix containing both 2,3‐dihydrofuran and N ‐methylmaleimide monomers. N ‐Methylmaleimide radical cations initially formed are rapidly transformed into radical cations of the better electron donor 2,3‐dihydrofuran. The transformations of the radical cations and subsequent radicals with increasing temperature were followed by EPR. The spectra were compared with density functional calculations (B3LYP, Gaussian 98 W). The 2,3‐dihydrofuran radical cation is found to initiate free radical copolymerisation.