Primary processes of photopolymerization or photocrosslinking in dichromated systems

Michel Bolte

doi:10.1117/12.166337

20 January 1994 Primary processes of photopolymerization or photocrosslinking in dichromated systems

Michel Bolte

Proceedings Volume 2042, Photopolymers and Applications in Holography, Optical Data Storage, Optical Sensors, and Interconnects; (1994) https://doi.org/10.1117/12.166337
Event: Optics Quebec, 1993, Quebec City, Canada

Abstract

The photoredox process occurring between HCrO₄^- and a vinyl monomer (acrylamide or acrylonitrile) leads to the formation of chromium(III) and the polymer as final photoproducts. The primary process is a charge transfer between HCrO₄^- in the excited state and the monomer giving rise to chromium(V) and to an organic radical initiator of the polymerization. The influence of pH, monomer concentration, absorbed light intensity I_a and chromium(VI) concentration on the polymerization rate R_p are reported. Two different domains are detected as a function of chromium(VI) concentration: at low concentration, the process of chain termination occurs by mutual annihilation of the macroradicals whereas at high concentration a process of oxidative termination of the radicals by chromium(VI) is involved. The influence of copper(II) on these different processes is also described.

Citation Download Citation

Michel Bolte "Primary processes of photopolymerization or photocrosslinking in dichromated systems", Proc. SPIE 2042, Photopolymers and Applications in Holography, Optical Data Storage, Optical Sensors, and Interconnects, (20 January 1994); https://doi.org/10.1117/12.166337

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