The effect of high pressure and controlled stretching on the intramolecular twist of p-N-N-dirnethylaminobenzylidenemalononitrile in polyvinylacetateand polyvinylchloride

The effect of pressure and controlled stretching has been measured on both the steady-state and time-dependent emission from p-N-N-dimethylaminobenzyl idenemalononitrile (DMABMN) in polyvinylacetate (PVA) and polyvinylchloride (PVCl). Using a model involving the radiative and non-radiative rates of d issipation of the excited state energy as well as the transfer rates betwee n the planar and twisted excited states, one can predict the changes in ste ady-state emission from the time-dependent data for both the effect of pres sure and controlled stretching. (C) 2000 Published by Elsevier Science B.V. All rights reserved.