Abstract
Abstract Dichroic spectra of polyenes –(CH=CH)n– produced in heat-treated poly(vinyl alcohol) [PVA] film were determined for two cases; stretch (at 85 °C) after heat (120 °C), (Δ,S), and heat after stretch, (S,Δ). The dichroic ratios Rdn of component polyenes (n=2–6) were estimated by means of simulation. In both cases (Δ,S) and (S,Δ), the relation of Rdn vs. Rs (stretch ratio) kept the theoretical equation of the dichroism analysis. The relative angles among the transition moments μn (n=2–6) were in accordance with those obtained by drawings of trans-polyenes. The idea of an azimuth vector in the stretched PVA substrate was justified. The relation of Rdn(Δ,S)>Rdn(S,Δ) was always observed at any Rs. This was explained by the thermal orientation-relaxation of polymer chains.
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