Thermal stability of PVC formulations gamma irradiated at different dose rates

被引：21
|
作者：
Castaneda-Facio, A. [1 ]
Benavides, R. [2 ]
Martinez-Pardo, M. E. [3 ]
机构：
[1] Univ Autonoma Coahuila, Fac Ciencias Quim, Saltillo 25280, Coahuila, Mexico
[2] Ctr Invest Quim Aplicada, Saltillo 25294, Coahuila, Mexico
[3] Inst Nacl Invest Nucl, Mexico City 11801, DF, Mexico
来源：
RADIATION PHYSICS AND CHEMISTRY | 2014年 / 97卷
关键词：
PVC; Gamma irradiation; Thermal stabilization; Activation energy (E-a); POLY(VINYL CHLORIDE); STABILIZATION; DEGRADATION; DECOMPOSITION;
D O I：
10.1016/j.radphyschem.2013.11.004
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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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收藏
页码：75 / 80
页数：6
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