Singlet Energy Transfer in a 1-Naphthyl Methacrylate-9-Vinylanthracene Copolymer

Abstract

Studies have been made of electronic energy transfer from the naphthalene groups in poly-(1-naphthyl methacrylate) to vinylanthracene traps located at chain ends. It is shown that the transfer is strictly intramolecular in dilute solution, and that the efficiency of transfer depends on the solvent power, being greater in solvents which tend to reduce the dimensions of the random coil. Studies of fluorescence decay times by photon counting suggest that the transfer of energy takes place in times of 1 ns or less, and temperature studies indicate that transfer occurs from naphthyl monomer rather than the excimer.

Syntheses and alignment behavior of liquid crystalline polymethacrylates having 2‐ and 4‐styrylpyridine moieties

“…The polymer 2 in the solution displays a lower intensity of the band around 375 nm but a higher intensity above 450 nm as compared to 1 . In particular, 2 shows distinctly a broad red‐shifted band in the range of 450 nm to 550 nm, which indicates that the aromatic rings in the side chains form excimers intramolecularly or exciplexes intermolecularly 30, 31. Also, 2 , in the film, exhibits a lower intensity in the range of 350–475 nm as compared to 1 .…”

Miscibility Studies in Blends of Poly(methyl methacrylate) with Poly(styrene-co-methacrylonitrile) Using Solid-State NMR and Fluorescence Spectroscopy

“…The proton spin-lattice relaxation time in the rotating frame, TlPH, was measured by spin-locking the lH magnetization prior to cross-polarization (1 ms contact time) to the 13C nuclei. A spin-locking field of 71 kHz was applied for up to 30 ms. Measurements were made at 25 and 60 "C.…”

Current Status on Plastic Scintillators Modifications

“…This compromise makes it a target of choice for scintillation application as the monomer methyl methacrylate (MMA) is quite cheap and its polymerization chemistry is known (Scheme ). In PSt‐based PSs the energy deposited by an ionizing radiation is mainly absorbed by the polymer matrix, which can be efficiently transferred to the emitters by means of Förster energy exchange,7 whereas PMMA‐based scintillators have to rely on less efficient non‐radiative exchanges. Primary emitters are frequently referred as the secondary solvent, because they account for a large part of the scintillator to maximize scintillation yield.…”