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Proceedings Paper

Kinetic analysis of laser-induced reactions in polymer films
Author(s): Christian Decker
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Paper Abstract

Laser-assisted processing is one of the most efficient methods to induce ultrafast reactions in polymer films. The photopolymerization of acrylic systems is shown to occur almost instantly by simple exposure to a pulsed or CW laser emitting in the UV range. The kinetic profile of the reaction was directly recorded in the millisecond timescale by using the newly developed real-time infrared (RTIR) spectroscopy. The important kinetic parameters have thus been determined, such as the actual rate and quantum yield of the polymerization, the sensitivity and the contrast of the photoresist. Timeresolved JR spectroscopy is particularly well suited to study the kinetics of any polymer system undergoing ultrafast chemical modifications upon laser irradiation. Compared to the other analytical methods used in kinetic analysis, R1'IR spectroscopy proved to be more sensitive and reliable, while providing instantly quantitative information about the actual extent of reactions that develop within a fraction of a second. The strongly crosslinked polymers obtained by laser irradiation exhibit remarkable properties, in particular an outstanding resistance to chemicals, organic solvents, heat and laser radiation. The main sectors of application of this laser technology are expected to be found in microelectronics for the high-speed writing of complex patterns at sub-micronic resolution, in stereolithography for the creation of 3 D solid objects and in optical engineering for the ultrafast coating of glass fibers and the production of laser-resistant optical components.

Paper Details

Date Published: 1 August 1990
PDF: 10 pages
Proc. SPIE 1279, Laser-Assisted Processing II, (1 August 1990);
Show Author Affiliations
Christian Decker, Ecole Nationale Superieure de Chimie/CNRS (France)

Published in SPIE Proceedings Vol. 1279:
Laser-Assisted Processing II
Lucien Diego Laude, Editor(s)

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