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Polymethyl methacrylate (PMMA) recycling for the production of optical fiber sensor systems

Prado, A. ; LEAL-JUNIOR, A. ; Marques, C. ; Leite, S. ; Sena, G. ; Machado, L. ; Frizera-Neto, A. Frizera-Neto ; R. N. Ribeiro, M. R. N. Ribeiro ; Pontes, M. J.

Optics Express Vol. 25, Nº 24, pp. 30051 - 30060, November, 2017.

ISSN (print): 1094-4087
ISSN (online):

Journal Impact Factor: 3,488 (in 2014)

Digital Object Identifier: 10.1364/OE.25.030051

Abstract
This paper proposes the recycling of poly (methyl methacrylate) plates, formerly used in LCD monitors to produce polymer optical fibers without cladding for sensor systems and a discussion about the fabrication process of the fiber cladding is briefly presented. After disassembling LCD monitors the acrylic plate is cleaned and submitted to an extrusion process. Extrusion temperatures of 220°C, 230°C and 240°C were applied, and the produced
polymer fibers were characterized by infrared and visible spectrometry, as well as evaluated for thermal analysis through differential scanning calorimetry (DSC) and thermal gravimetric
analysis (TGA). Furthermore, a refractive index sensor was developed with the recycled fibers. Results show that the recycled fiber refractive index sensor is linear (R2 = 0.99) and presents a sensitivity of more than 4 times higher when compared to a sensor using a commercial POF.