Reversible Molecular Orientation in Stressed Bisphenol-A Polycarbonate

R. A. Mosher; W. M. Prest Jr.

doi:10.1117/12.970750

20 December 1985 Reversible Molecular Orientation in Stressed Bisphenol-A Polycarbonate

R. A. Mosher, W. M. Prest Jr.

Proceedings Volume 0553, Fourier and Computerized Infrared Spectroscopy; (1985) https://doi.org/10.1117/12.970750
Event: 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, 1985, Ottawa, Canada

Abstract

The reversible, stress induced changes in the vibrational modes of amorphous bisphenol-A polycarbonate films have been determined by polarized FTIR. The change in the polarization of the integrated intensities of each absorption band are consistent with the preferential alignment of the molecular segmental axis parallel to the applied stress in the low strain elastic deformation region. This implies that the stresses are primarily transmitted through the chain backbone. The stress induced dichroism of the assignable modes corresponds to 0.1%/MPa increase in the degree of orientation. The CH bands are not a function of stress and there is a slight stress induced shift in the frequency of the 1081 cm-1 band towards lower energies. These results indicate that the environment of the inplane modes is perturbed and suggests that the stress transmitted through the polymeric backbone partially relaxes the steric constraints that restrict the orientation of the ortho protons of the phenol rings.

Citation Download Citation

R. A. Mosher and W. M. Prest Jr. "Reversible Molecular Orientation in Stressed Bisphenol-A Polycarbonate", Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); https://doi.org/10.1117/12.970750

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