Direct and sensitized photolysis of phosphine oxide polymerization photoinitiators in the presence and absence of a model acrylate monomer: A time resolved EPR, cure monitor, and photoDSC study

Article Abstract:

The effect of triplet sensitizers on the photoinitiated polymerization (cure) of a model acrylate monomer, isobornyl acrylate (IBOA) is investigated with time-resolved electron paramagnetic resonance (Tr EPR) spectroscopy and cure monitoring and photodifferential scanning calorimetry (photoDSC). It is suggested that photosensitization may provide a means of manipulating and controlling the parameters of photocuring of acrylates.

Methods, Photolysis, Acrylates

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Study of charge-transfer complexes of [60]- and [70]fullerenes with a series of phosphine oxides

Article Abstract:

Equilibria for the formation of molecular electron donor-acceptor (EDA) complexes of a series of phosphine oxides with [60]- and [70] fullerenes are investigated in CCl4 medium. The kinetic study of a slow chemical reaction of the two fullerenes in their ground state with one phosphine oxide, which is, the labile BEHP-fullerene complexes decay by a path first order with respect to the complexes is reported.

Electron donor-acceptor complexes

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Oximetry of oxygen supersaturated solutions using nitroxides as EPR probe

Article Abstract:

The broadening of the three-hyperfine EPR nitroxide lines in oxygen-supersaturated solutions was examined. The solutions were supersaturated with oxygen either by thermal decomposition of 1,4-peroxy-1,4-dimethylnaphthalene or by pressurizing molecular oxygen above the sample solution, to describe the requirement for spectral simulation in this region of line broadening.

Nitrogen Oxide Gases, Electric properties, Nitrogen oxides, Electron paramagnetic resonance, Nitrogen oxide, Oximetry

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