Abstract
The resonance Raman (r.R.) spectra of two highly conducting, but distinct, iodine-doped rubber samples, natural rubber (NR) and pseudo-interpenetrating polymer (PIPN) (NR with crosslinked polyurethane) have been investigated. Both systems with excessive iodine exhibit nearly indistinguishable r.R. spectra, with well-resolved iodine modes in the low-frequency region, < 1000 cm −1, and a nearly featureless spectrum in the region of the polymer modes, > 1000 cm −1. When the excess iodine is washed, the r.R. spectrum in the low-frequency range remains unchanged, but the high-frequency region becomes distinct. NR exhibits enhanced polymer backbone modes, but the PIPNs retain featureless spectra. These findings suggest that energy transfer from iodine to the polymer backbone in the case of NR is evident, but no such path exists in the PIPN samples, i.e. different energy transfer paths are operational.
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