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International Journal of Polymer Science
Volume 2017 (2017), Article ID 1870814, 10 pages
https://doi.org/10.1155/2017/1870814
Research Article

A Comparative Study of the Photodegradation of Two Series of Cyclic Olefin Copolymers

Centro de Investigación en Química Aplicada, Departamento de Procesos de Transformación de Plásticos, Blvd. Enrique Reyna Hermosillo No. 140, Col. San Jose de los Cerritos, 25294 Saltillo, COAH, Mexico

Correspondence should be addressed to Mario H. Gutiérrez-Villarreal

Received 9 January 2017; Revised 23 March 2017; Accepted 24 April 2017; Published 13 July 2017

Academic Editor: Bernabé L. Rivas

Copyright © 2017 Mario H. Gutiérrez-Villarreal and Sara A. Zavala-Betancourt. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A series of commercial cyclic olefin copolymers (COC), namely, ethylene-norbornene (E-NB) and ethylene-tetracyclododecene (E-TD), were processed as thin films with thicknesses of 25 μm by an extrusion process. The photodegradation of neat and formulated films with different metal stearates (Fe, Co, and Mn) was investigated using an ultraviolet (UV) light lamp (340 nm) for a period of 30 days in an accelerated weathering tester model QUV from Q-LAB according to the ASTM D 5208-01 standard practice. Changes in carbonyl index (CI) and tensile properties were used to evaluate the photodegradation of the films and other properties, such as variation by DSC, were also analyzed. The present study reveals that (E-NB) copolymers show higher sensitivity to photodegradation than (E-TD) resins, in the absence and presence of metal stearates. We also find that the Fe salt shows the highest oxidative activity.