Polyacetylene Segments in a Polyvinylidene-Chloride Matrix: Anisotropic Optical Properties
Thermal degradation of polyvinylidene-chloride (PVDC) under applied mechanical stress leads to the formation of oriented conjugated sequences embedded in the PVDC matrix. Polarized infrared spectra show absorptions related to C-H- vibrations with a polarization dependence typical for polyacetylene. Transmission spectra in the visible range show highly anisotropic properties even at low concentration of conjugated bonds. Distinct absorptions in the perpendicular polarization can be attributed to different conjugation lengths. Long-time storage in air results in a polarized absorption peak in the band gap region, which can be completely removed by long-time compensation with NH3.
KeywordsOptical Absorption Spectrum Polarization Dependence Conjugation Length Chain Axis Perpendicular Polarization
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