Powd. samples of cotton, flax and viscose from textile fibers were subjected to electron beam irradn. (20-400 KGy). ESR signals were obsd. after irradn. The intensity of the signals depended on the administered dose and exhibited an exponential decay with time. The ESR spectra, whose pattern depended drastically on the crystallinity of the samples, indicated the simultaneous presence of at least three carbon-centered radical species. When the whole irradiated textile fibers were quenched in a soln. of glycidyl methacrylate (GMA) a significant increase of the wt. was obsd., the increase being strongly dependent on the administered dose and on the time interval elapsed between irradn. and quenching. Spectroscopic characterization evidenced that GMA acted as cellulose radicals scavenger on the unsubstituted carbon of the double bond and was covalently linked to the fiber through a new C-C bond while maintaining unaltered the ester and the epoxide groups, available for further derivatization. Because irradn. of the whole textile fibers in the range 20-200 KGy does not result in significant degrdn. of the material, GMA quenching of fibers irradiated in this dose range may represent an attractive route to their functionalization.
Electron beam irradiated textile cellulose fibres. ESR studies and derivatisation with glycidyl methacrylate (GMA)
VISMARA, ELENA
2005-01-01
Abstract
Powd. samples of cotton, flax and viscose from textile fibers were subjected to electron beam irradn. (20-400 KGy). ESR signals were obsd. after irradn. The intensity of the signals depended on the administered dose and exhibited an exponential decay with time. The ESR spectra, whose pattern depended drastically on the crystallinity of the samples, indicated the simultaneous presence of at least three carbon-centered radical species. When the whole irradiated textile fibers were quenched in a soln. of glycidyl methacrylate (GMA) a significant increase of the wt. was obsd., the increase being strongly dependent on the administered dose and on the time interval elapsed between irradn. and quenching. Spectroscopic characterization evidenced that GMA acted as cellulose radicals scavenger on the unsubstituted carbon of the double bond and was covalently linked to the fiber through a new C-C bond while maintaining unaltered the ester and the epoxide groups, available for further derivatization. Because irradn. of the whole textile fibers in the range 20-200 KGy does not result in significant degrdn. of the material, GMA quenching of fibers irradiated in this dose range may represent an attractive route to their functionalization.File | Dimensione | Formato | |
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