Journal
RADIATION PHYSICS AND CHEMISTRY
Volume 97, Issue -, Pages 75-80Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radphyschem.2013.11.004
Keywords
PVC; Gamma irradiation; Thermal stabilization; Activation energy (E-a)
Funding
- Consejo Nacional de Ciencia y Tecnologia (CONACyT-Mexico)
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Polyvinyl chloride (PVC) formulated with two different stabilizer systems (Ca/Zn stearates and dibasic lead phthalate) irradiated at 75 kGy at two different dose rates were studied in order to evaluate their effect in thermal stability. Samples were degraded in a TGA instrument at different heating rates and the activation energy (E-a) to dehydrochlorination was calculated using the Arrhenius method in accordance with ASTM E 1641-07. TGA evaluations show that temperature for HCl evolution is higher when increasing heating rate, as well as higher resistance to degradation, for irradiated lead formulations; however, after activation energies calculation the irradiated Ca/Zn formulations are more stable. The controversial results are due to the low initial stability of lead additives in PVC. (C) 2013 Elsevier Ltd. All rights reserved.
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