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Proceedings Paper

Vitrification of photo-curing resins by embedded cantilever and Fizeau interferometer
Author(s): Gustavo F. Arenas; Ricardo Duchowicz
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Paper Abstract

We present a method for estimating the relative viscosity and vitrification degree of photo-curing polymeric materials. Real-time knowing of solidification transition provides important information for many scientific areas. The technique involves the embedding of one end of a small aluminum cantilever subjected to oscillations of constant amplitude and frequency, into blends made of unfilled dental resins based on bis-GMA-TEGDMA. These resins were activated for visible light polymerization by the addition of camphorquinone (CQ) in combination with dimethylamino ethylmethacrylate (DMAEMA), or ethyl-4-dimethyl aminobenzoate (EDMAB). As the polymerization process progresses, the embedded end of the beam ceases to be free. Thus, changes in the oscillation amplitude at a given point near the lower end measured by a Fizeau fiber optic interferometer can be interpreted as a proportional indicator of solidification in the resin being photocured. Proper measurement of this phenomenon provides a more quantitative support in the early stages of photo-polymerization. Our results show that the resin passes from liquid to gel, and then to a vitreous state, in a short time compared with the total photo-curing evolution. As a consequence, after this transition, polymerization seems to develop mainly by diffusive processes.

Paper Details

Date Published: 25 October 2011
PDF: 7 pages
Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80114Y (25 October 2011); doi: 10.1117/12.902194
Show Author Affiliations
Gustavo F. Arenas, Univ. Nacional de Mar del Plata (Argentina)
Ricardo Duchowicz, Univ. Nacional de La Plata (Argentina)
Ctr. de Investigaciones Ópticas (Argentina)

Published in SPIE Proceedings Vol. 8011:
22nd Congress of the International Commission for Optics: Light for the Development of the World
Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Ramón Rodríguez-Vera; Rufino Díaz-Uribe; Rufino Díaz-Uribe; Rufino Díaz-Uribe, Editor(s)

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