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4 results on '"Sun, Benjamin J."'

1. Fluorescence quantum yield of poly(p-phenylenevinylene) prepared via the paracyclophene route: effect of chain length and interchain contacts

Author

Bazan, Guillermo C., Miao, Yi-Jun, Renak, Michelle L., and Sun, Benjamin J.

Subjects
Cyclic compounds -- Research, Polymers -- Research, Quantum chemistry -- Research, Electrochemistry -- Research, Chemistry
Abstract

A paracyclophene pathway to poly(p-phenylenevinylene) (PPV) was implemented to study the relationship between chain length, interchain separation and photoluminescence quantum yield of PPV. The approach involved the polymerization of the monomer 9- (tert-butyldimethylsilyl)oxy 2.2 paracyclophan-1-ene. The experiment revealed that PPVx-block-polynorbornene synthesized in solution had larger photoluminescence quantum yield than those prepared by solid-state dehydration.

Published
1996

2. Photophysics of poly(paracyclophan-1-ene) and derivatives: evidence for intrachain energy transfer and chromophore aggregation

Author

Miao, Yi-Jun, Herkstroeter, William G., Sun, Benjamin J., Wong-Foy, Antek G., and Bazan, Guillermo C.

Subjects
Polymers -- Analysis, Energy transfer -- Observations, Chemistry
Abstract

The polymer of (2.2)paracyclophan-1-ene and its other derivatives are obtained by treating the respective monomer with the Schrock initiator Mo(NAr)(OC(CF3)2Me)2-(CHCMe2Ph) (Ar = 2,6-diisopropylphenyl). These stereoregular main-chain polystilbenes are structurally related to poly(p-phenylenevinylene). The paracyclophan-1-enes have high ratios of chromophore compared to the total polymer mass. Considerable energy transfer occurs from excited monomeric stilbenes to the aggregated sites.

Published
1995

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