ORIENTATION OF MOLECULAR SEGMENTS BY PLASTIC-DEFORMATION OF GLASSY POLYCARBONATE

Annealed, selectively C-13-labeled Bisphenol A polycarbonate samples w ere uniaxially compressed (compressive strain ca. 40%). One-dimensiona l static NMR spectra of the deformed samples were recorded at differen t orientations with respect to the magnetic field. The orientational d istributions of the carbonate groups and the phenylene rings were dete rmined through a fitting of the spectra by an expansion in Wigner rota tion matrix elements. The data are explained quantitatively by an affi ne network-deformation model. The chains qualitatively behave as compr essed random coils.