Energy transfer, polymerization enhancement

Fig. 16. Structures of the tetracationic porphyrin (TAPP) donor and the tricationic cyanine dye (Cy3+) acceptor used in the polymerization-enhanced energy transfer experiments.

Armitage, B., Klekota, P.A., Oblinger, E., and O Brien, D.F. (1993) Enhancement of energy transfer on bilayer surfaces via polymerization-induced domain formation, J. Am. Chem. Soc., 115, 7920-7921. 

Polymerization of surfactant within a bilayer membrane induced a formation of specific domain that concentrated cyanine and porphyrin molecules to enhance the energy transfer. The energy transfer efficiency increased up to 71% at a 100% polymerization, whereas the efficiency was 9% without polymerization. 

The depletion of O2 enhances the lifetime of PIf and, therefore, its effectiveness as an energy transfer agent for decomposing RO2H into alkoxy and hydroxy radicals, as shown in equation (10). In contrast to peroxy radicals, the resulting alkoxy and hydroxy radicals are effective initiators for acrylate polymerization. Thus, the overall process (Scheme 4) results in the use of O2 to produce initiator radicals. Evidence for photosensitized cleavage of peroxides and hydroperoxides, using ITX (8), in accordance with equation (10), has been reported. 

DP E F f f. Ha He AG Degree of polymerization Activation energy, enhancement factor for gas-liquid mass transfer with reaction, electrochemical cell potential Faraday constant, F statistic Efficiency of initiation in polymerization Ca/CaQ or na/nao, fraction of A remaining unconverted Hatta number Henry constant for absorption of gas in liquid Free energy change kj/kgmol Btu/lb-mol... 

Dk DP E Knudsen diffusivity Degree of polymerization Activation energy, enhancement factor for gas-liquid mass transfer with reaction. mVs ft"/s... 

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