Abstract
Abstract The optical response of trans-polyacetylene, (CH)x, has been studied at pressures up to 150 kbar. From the absorption edge position versus pressure, three main regions are identified: a stability region, 0–50 kbar, with a reversible red-shift of the absorption edge; a reactive region, 50–80 kbar, with the onset of irreversible behavior; and a transformation region, above 80 kbar, where a material transparent to visible light is formed. Raman spectra suggest that the identity of the polymer is maintained throughout the investigated pressure range. The drastic change in optical properties is attributed to the generation of crosslinks with consequent reduction of the average undisturbed chain length.
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