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Open AccessArticle

A Quantitative Spectroscopic Study of the Bleaching Phenomena in Plasticized Formulations Containing PVC Exposed to Outdoor Conditions

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Chemistry Department, Universidad de Guadalajara, 44100 Guadalajara, Mexico
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Chemical Engineering Department, Universidad de Guadalajara, 44100 Guadalajara, Mexico
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Author to whom correspondence should be addressed.
Polymers 2019, 11(9), 1481; https://doi.org/10.3390/polym11091481
Received: 11 August 2019 / Revised: 31 August 2019 / Accepted: 3 September 2019 / Published: 11 September 2019
(This article belongs to the Special Issue Degradation and Stabilization of Polymer-Based Materials)
In this work, a quantitative spectroscopic study of the bleaching phenomena occurring in plasticized formulations containing poly(vinyl chloride) was performed, proposing a general methodology to comparatively analyze the effect of degrading conditions on the polyene accumulation behaviors (PABs) exhibited by a set of tested formulations. In the study, a set of environmental indexes (temperature (T*), UV energy (UV*), and days with rain) were proposed, which allowed for the suitable globalization of the changing environmental conditions occurring throughout the different degrading periods. A procedure to numerically describe the PAB, followed by each formulation undergoing each degrading condition was also proposed, which required only two primary fitting parameters and four secondary fitting parameters. Then, the combined effects of certain environmental conditions on the PABs were studied, quantifying the stabilizing effects of the rain and the combined decrement on the T* and UV* indexes. Finally, on the basis of the proposed fitting equation and the values of its fitting parameters, the relative importance of the dehydrochlorination reactions as compared with the photo-oxidative reactions simultaneously occurring in the studied systems was estimated. View Full-Text
Keywords: plasticized PVC; bleaching phenomena; outdoor conditions; degrading behavior; polyene accumulation behavior; semi-empirical model plasticized PVC; bleaching phenomena; outdoor conditions; degrading behavior; polyene accumulation behavior; semi-empirical model
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MDPI and ACS Style

González-Falcón, E.; Arellano, M.; Sanchez-Peña, M.J.; González-Ortiz, L.J. A Quantitative Spectroscopic Study of the Bleaching Phenomena in Plasticized Formulations Containing PVC Exposed to Outdoor Conditions. Polymers 2019, 11, 1481.

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