CONSUMPTION OF THE MOLECULAR OXYGEN IN POLYMERIZATION SYSTEMS USING PHOTOSENSITIZED OXIDATION OF DIMETHYLANTHRACENE
- 1 May 2006
- journal article
- research article
- Published by Taylor & Francis in Chemical Engineering Communications
- Vol. 193 (5) , 620-627
- https://doi.org/10.1080/00986440500193921
Abstract
It is well known that the presence of oxygen in free radical polymerization systems leads to an inhibition period and a lowered ultimate conversion. In this contribution, we report a method for consuming molecular oxygen photochemically before the polymerization takes place, thereby allowing the reaction to proceed in an oxygen-free environment. The method is based on the generation of singlet oxygen by reaction of the ground state oxygen with the excited triplet state of the singlet oxygen generator (a porphyrin, Znttp). The singlet oxygen is then consumed by reaction with a second compound (the singlet oxygen trapper, dimethylanthracene). The possible factors that might affect the efficiency of the singlet oxygen generation/trapping processes were discussed and the effectiveness of a dimethylanthracene/Znttp combination for consumption of oxygen was investigated in two acrylate systems of different viscosity.Keywords
This publication has 5 references indexed in Scilit:
- Measurement of the dissolved oxygen concentration in acrylate monomers with a novel photochemical methodJournal of Polymer Science Part A: Polymer Chemistry, 2004
- Photobleaching of sensitisers used in photodynamic therapyTetrahedron, 2001
- Polymerization kinetics of photocurable acrylic resinsJournal of Polymer Science Part A: Polymer Chemistry, 1998
- Radiation Curing in Polymer Science and Technology—Volume IIPublished by Springer Nature ,1993
- Barrier coats versus inert atmospheres. The elimination of oxygen inhibition in free-radical polymerizationsJournal of Applied Polymer Science, 1978