Thermal behavior and decomposition kinetic studies of biomedical UHMWPE/vitamin C compounds 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Journal of thermal analysis and calorimetry
年/卷/期
2018 / 134 / 3
页码
2097-2105
ISSN号
1388-6150
作者单位
Univ Fed Paraiba, Programa Pos Grad Ciencia & Engn Mat, Cidade Univ S-N, BR-58051900 Joao Pessoa, Paraiba, Brazil;Univ Fed Paraiba, Programa Pos Grad Ciencia & Engn Mat, Cidade Univ S-N, BR-58051900 Joao Pessoa, Paraiba, Brazil;Univ Fed Paraiba, Programa Pos Grad Engn Civil & Ambiental, Cidade Univ S-N, BR-58051900 Joao Pessoa, Paraiba, Brazil;Univ Fed Paraiba, Programa Pos Grad Ciencia & Engn Mat, Cidade Univ S-N, BR-58051900 Joao Pessoa, Paraiba, Brazil;
作者
Souza, V. C.;Santos, E. B. C.;Mendonca, A. V.;Silva, L. B.;
摘要
In this paper, the effects of adding vitamin C to biomedical ultra-high molecular weight polyethylene (B-UHMWPE) on thermal behavior and thermal degradation kinetics are investigated. The kinetic studies were conducted using Ozawa-Flynn-Wall (OFW), corresponding to pre-exponential factor (A) and activation energy (E-a). Compounds with 1.0 and 2.0% mass vitamin C exhibited a lower decomposition rate. Activation energy results from the OFW and Kissinger methods were close to each other and showed a dependence on the degree of conversion (), with E-a being an increasing function of conversion degree to B-UHMWPE and a decreasing function for the compounds. Finally, the pre-exponential factor increases with the addition of vitamin C, favoring its interaction with the free radicals originated from the thermal degradation of B-UHMWPE, also suggesting a reduction in its decomposition rate.
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关键词/主题词
Biomedical UHMWPE;Vitamin C;Thermal stability;Kinetic methods;Activation energy;
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