¹³C-NMR SPECTRA OF PET SHORT FIBER-CR COMPOSITE

Abstract

PET short fibers were treated with RFL system and were filled together with carbon black in CR matrix. ¹³C-NMR spectra of PET-CR composites were measured in solid state at 25°C. The spectra of CR matrix showed four sharp peaks which were ascribed to the carbon linked by different kinds of configurations. The ¹³C line widths were affected by fillers. The line widths of individual carbons of carbon black-filled CR were broader than those of ordinary CR by about two times. The spectra of RFL-treated PET-CR composites showed shoulders at about 4ppm higher field than the respective peaks of CR spectra after curing. It seems that the new shoulders arise from the restricted phase formed at the interfacial region between RFL-treated PET fibers and CR matrix.