The emission spectra of polyaeenaphthylene (PA&T) and polyvinyluaphthalene (PVN) tihus and solutions have heen compared at room temperature and 77°K. In organic glasses at 77'K, normal fluoresceuee and phosphorescence are observed for both polymers. Quenching of PAcN phosphorescence by piperylene in
Energy transfer in polymers—I. Triplet-triplet transfer in solid polyvinylbenzophenone-naphthalene system
✍ Scribed by C. David; W. Demarteau; G. Geuskens
- Publisher
- Elsevier Science
- Year
- 1970
- Tongue
- English
- Weight
- 378 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0014-3057
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✦ Synopsis
Energy transfer has been shown to occur from triplet polyvinylbenzophenone to naphthalene by an exchange mechanism at liquid nitrogen temperature. The radius of the Terenin "critical sphere" is much larger for the polymer containing naphthalene (29.3,) than for mixtures benzophenonenaphthalene in organic glasses (11 A.). The results are interpreted in terms of energy migration in the polymer according to Voltz theory.
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~aet--The etfieiency of transfer from the triplet of polymethylvinylketone (PMVK) to naphthalene has been measured at 77°K. The critical distance of transfer according to Hirayama is 11.3 A. This is the usual value of Ro for exchange interaction without migration. Singiet energy transfer from the po
Al~tracl--The efficiency of triplet energy transfer from the benzophenone group to naphthalene has been studied in a series of copolymers styrene-vinylbenzophenone, either as films or in glassy solutions at 77 K. Energy migration has been shown to be efficient in both cases. For a given copolymer, H
The methods of steady state ODMR and transient ODMR yield rates for the triplet-triplet enerm transfer process of order 10 s-1.
T~plet~oubIet energy transfer from the naphthalene triplet to the ~nzophenone ketyl radicai has been studied in tetrahydrofumn at room temperature by measuring transient absorption and fluorescence spectra and decay profiles. The rate constant for the energy-transfer process has been determined to b