Abstract
Studies have been made of energy migration and transfer in dilute solutions of poly(phenylacetylene). In fluid media, “down-chain” energy migration is very efficient (being limited only by chain length in the system studied); however, in a rigid matrix, the energy migration rate is significantly lower. It is suggested that segmental rotation in a fluid environment brings neighbouring chain units into conformations suitable for resonance energy transfer and also breaks conjugated sequences functioning as exciton “traps”. The broad absorption spectrum (and relatively high extinction coefficients) coupled with the efficient transfer of the energy make these substances very efficient energy transfer additives in polymer systems.
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