Kinetics of poly(vinyl chloride) thermal degradation by ionizing radiation

Fábio Cerdeira Lírio; Mauro Carlos Lopes Souza; Alex da Silva Sirqueira; Bluma Guenther Soares

doi:10.47385/cadunifoa.v15.n44.3405

Autores

Fábio Cerdeira Lírio Doutor em Ciências (DSc.) - Instituto Federal de Educação Ciência e Tecnologia do Rio de Janeiro - IFRJ
Mauro Carlos Lopes Souza Doutor em .ciências (DSc.) - Centro Universitário Estadual Zona Oeste
Alex da Silva Sirqueira UEZO
Bluma Guenther Soares Doutora em ciência (DSc.) - Universidade Federal do Rio de Janeiro

DOI:

https://doi.org/10.47385/cadunifoa.v15.n44.3405

Palavras-chave:

Polímeros. Degradação. Pvc

Resumo

In this study, the relationship between ionizing radiation treatment and thermal degradation kinetics of Poly (vinyl chloride) (PVC) polymer film was investigated. The unirradiated and 25 kGy irradiated samples treated with gamma rays or electron beam radiation were submitted to thermogravimetric analysis (TGA) at different heating rates (10 – 30 K.min-1). The TGA data was used to obtain the apparent activation energy values (Ea) according to Flynn-Wall-Ozawa method. TGA analysis suggested that electron beam radiation promotes a slight increase on maximum temperature for dehydrochlorination reaction on PVC. Gamma-rays irradiation caused a small reduction of maximum temperature of HCl evolution of PVC. Thermal degradation kinetics results showed that 25 kGy irradiated samples presents an apparent activation energy values from 104 - 109 KJ.mol-1. The apparent Ea values suggested that 25 kGy gamma radiation or 25 kGy electron beam radiation convert PVC polymer films more prone to HCl evolution due to radiolysis of polymer. Evaluation of the Ea values by Flynn-Wall-Ozawa method allows a good analytical instrument to comprehend dehydrochlorination reaction on irradiated PVC polymer films.

Downloads

Não há dados estatísticos.

Referências

Odian G., Principles of Polymerization. N. York: John Wiley & Sons Publishing; 2004.

Hakkarainen M., New PVC materials for medical applications – the release profile of PVC/polycaprolactone-polycarnonate aged in aqueous environments. Polymer Degradation and Stability. 80(3) 451-458. 2003.

Bernard L, Décaudin B, Lecoeur M, Richard D, Bourdeaux D, Cueff R and Sautou V., Analytical methods for the determination of DEHP plasticizer alternatives present in medical devices: a review. Talanta. 129(1): 39-54. 2014.

Seguchi T, Tamura K, Ohshima T, Shimada A and Kudoh H. Degradation mechanisms of cable insulation materials during radiation-thermal ageing in radiation environment. Radiation Physics and Chemistry. 80(2): 268-273. 2011.

Haji-Saeid M, Sampa MHO and Chmielewski AG. Radiation treatment for sterilization of packaging materials. Radiation Physics and Chemistry. 76(8/9): 1535-1541. 2007.

Laverne JA., Carrasco-Flores EA, Araos MS and Pimblott SM. Gas production in the radiolysis of Poly vinyl chloride. Journal of Physical Chemical A.112: 3345-3351. 2008

Mohammed FS, Conley M, Rumple AC, Saunders SR, Switzer J, Urena-Benavides E, Jha R, Cogen JM, Chaudhary BI, Pollet P, Eckert CA and Liotta CL. Enhanced thermal stabilization and reduced color formation of plasticized Poly(vinyl chloride) using zinc and calcium salts of 11-maleimideoundecanoic acid. Polymer Degradation and Stability. 111: 64-70. 2015.

Colombani J, Labed V, Joussot-Dubien C, Périchaud A, Raffi J, Kister J and Rossi C. High doses gamma radiolysis of PVC: mechanisms of degradation. Nuclear Instruments and Methods in Physics Research B. 265(1): 238-244. 2007.

González-Ortiz LJ, Arellano M, Jasso CF, Mendizábal E and Sánchez-Peña MJ. Thermal stability of plasticized poly (vinyl chloride) compounds stabilized with pre-heated mixtures of calcium and/or zinc stearates. Polymer Degradation and Stability. 90: 154-161. 2005.

Vinhas GM, Souto Maior RM and De Almeida YMB. Radiolytic degradation and stabilization of poly (vinyl chloride). Polymer Degradation and Stability. 83(3): 429-433. 2004.

Bueno-Ferrer C, Garrigós MC and Jiménez A. Characterization and thermal stability of poly (vinyl chloride) plasticized with epoxidized soybean oil for food packaging. Polymer Degradation and Stability. 95: 2207-2212. 2010.

Sevil UA, Guven O, Birer O and Suzer S. Doping of 2-Cl-P ANI/PVC films by exposure to UV, γ-rays and e-beams. Synthetic Metals. 110(3): 175-179. 2010.

Sevil UA, Coskun E and Guven O. Electrical conductivity and spectroscopic characterization of blends of poly(2-chloroaniline)/polyaniline P(2CLANI)/PANI copolymer with PVC exposed to gamma-rays. Radiation Physics and Chemistry. 94: 45-48. 2014.

American Society for Testing and Materials. Standard ASTM E1641-16: Standard Test Method for Decomposition Kinetics by Thermogravimetry Using the Ozawa/Flynn/Wall Method, West Conshohocken – American Society for Testing and Materials. 2016.

Yao F, Wu Q, Le Y, Guo W and Xu Y. Thermal decomposition kinetics of natural fibers: activation energy with dynamic thermogravimetric analysis. Polymer Degradation and Stability. 93(1): 90-98. 2008.

Bianchi O, Oliveira RVB, Fiorio R, Martins JN, Zattera AJ and Canto LB. Assessment of Avrami, Ozawa and Avrami-Ozawa equations for determination of EVA crosslinking kinetics from DSC measurements. Polymer Testing. 27(6): 722-729. 2008.

Bockhorn H, Hornung A and Hornung U. Mechanisms and kinetics of thermal decomposition of plastics from isothermal and dynamic measurements. Journal of Analytical and Applied Pyrolysis. 50(2): 77-101. 1999.

Silva R, Carvalho GM, Muniz EC and Rubira AF. Miscibility influence in the termal stability and kinetic parameters of poly (3-hydroxybutyrate) / poly (ethylene terephthalate) sulphonated blends. Polímeros. 20(2): 153-158. 2010.

Wu J, Chen T, Luo X, Han D, Wang Z and Wu J. TG/FTIR analysis on co-pyrolysis behavior of PE, PVC and PS. Waste Management. 34(3): 676-682. 2014.

Boughattas I, Ferry M, Dauvois V, Lamouroux C, Dannoux-Papin A, Leoni E, Balanzat E and Esnouf S. Thermal degradation of γ-irradiated PVC: I-dynamical experiments. Polymer Degradation and Stability. 126: 219-226. 2016.