Accession Number : ADA267321


Title :   The Photophysics of Poly(methylphenylphosphazene)


Descriptive Note : Annual rept. 1 May 92-30 Apr 93,


Corporate Author : UNIVERSITY OF SOUTHERN MISSISSIPPI HATTIESBURG DEPT OF POLYMER SCIENCE


Personal Author(s) : Hoyle, C E ; Creed, D ; Subramanian, P ; Rufus, I B ; Chatterton, P


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267321.pdf


Report Date : 13 Jul 1993


Pagination or Media Count : 27


Abstract : The photophysical properties of poly(alkylarylphosphazenes), particularly poly(methylphenylphosphazene). PMPP, with a methyl and a phenyl group on the phosphazene phosphorous atom, have been investigated using absorption and emission spectroscopy, as well as laser flash photolysis. The fluorescence spectrum of PMPP shows a red-shifted emission (decay time greater than 1 nanosecond) with a maximum at 430 nm when excited at 270 nm in solvents of varying polarity. The absence of a strong solvent effect on the position and the structure of the fluorescence spectrum suggests that the emission is not due to a charge-transfer state, but originates from a significant geometry shift in the excited state. The triplet state of PMPP was identified by laser flash photolysis. The phosphorescence spectrum of PMPP indicates a triplet energy of 79 kcal/mol.


Descriptors :   *PHOTOCHEMICAL REACTIONS , *PHYSICAL PROPERTIES , FLUORESCENCE , POLYMERIZATION , ENERGY , ATOMS , CHARGE TRANSFER , EMISSION SPECTROSCOPY , ABSORPTION SPECTRA , PHOSPHORESCENCE , PHOSPHAZENE , FLASHES , DECAY , POLARITY , ABSORPTION , SOLVENTS , GEOMETRY , STRUCTURES , SYNTHESIS(CHEMISTRY) , POLYMERS , PHOTOLYSIS


Subject Categories : Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE