Effect of alkylated diphenylamine on thermal-oxidative degradation behavior of poly-α-olefin

2015 ◽  
Vol 69 (7) ◽  
Author(s):  
Mian-Ran Chao ◽  
Wei-Min Li ◽  
Li-Li Zhu ◽  
Hai-Hong Ma ◽  
Xiao-Bo Wang
Keyword(s):  
Activation Energy ◽  
Oxidative Stability ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation ◽  
Degradation Behavior ◽  
Thermal Oxidative Stability ◽  
Zinc Dialkyl Dithiophosphate ◽  
Dialkyl Dithiophosphate

AbstractAn oil-soluble antioxidant, alkylated diphenylamine (ADPA), was prepared by alkylation of diphenylamine. The influence of ADPA on the thermal-oxidative stability of poly-α-olefin (PAO8) was evaluated by thermogravimetry (TG). For comparison, the thermal-oxidative stability of PAO8 with zinc dialkyl dithiophosphate (ZDDP) was also investigated. Activation energy (E

Thermal Oxidative Degradation Behavior of Fluorinated Thermotropic Liquid Crystal Copolyesters

2015 ◽  
Vol 1088 ◽  
pp. 343-347
Author(s):  
Peng Wei ◽  
Shuo Han Huang ◽  
Yan Ping Wang ◽  
Yi Min Wang
Keyword(s):  
Liquid Crystal ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation ◽  
Degradation Behavior ◽  
Molar Percentage ◽  
Good Thermal Stability ◽  
Thermotropic Liquid Crystal ◽  
Air Atmosphere ◽  
Degradation Activation Energy ◽  
Bisphenol Af

In this study, the thermal oxidative degradation behavior of thermotropic liquid crystal copolyesters P-BPAFx containing 2.5-10 mol% bisphenol AF unit were evaluated by thermogravimetric analysis (TGA) technique under air atmosphere and the degradation activation energy (E) was obtained from Kissinger and Kissinger-Akahira-Sunose (KAS) method. The degradation behavior of copolyester are strongly dependent on the molar percentage of BPAF unit. Results showed that the E values obtained by the two methods increase first and then decrease slightly with increasing the BPAF unit and follow the order P-BPAF5.0< P-BPAF10<P-BPAF2.5, indicating P-BPAF2.5 has good thermal stability. The reason for this phenomenon was discussed in detail in the text.

scholarly journals Influence of coatings geocement activation energy of thermal oxidative degradation wood

2014 ◽  
Vol 1 (6(67)) ◽  
pp. 57
Author(s):  
Юрий Владимирович Цапко ◽  
Сергій Григорович Гузій ◽  
Анастасія Володимирівна Кравченко ◽  
Павло Васильович Кривенко
Keyword(s):  
Activation Energy ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation

Kinetic Study of Oxidative Scission in Natural Rubber by Wallace Plasticity Measurements

1992 ◽  
Vol 65 (1) ◽  
pp. 1-6 ◽  
Author(s):  
L. H. Gan ◽  
S. C. Ng ◽  
K. K. Chee
Keyword(s):  
Activation Energy ◽  
Kinetic Parameter ◽  
Natural Rubber ◽  
Kinetic Data ◽  
Oxidative Degradation ◽  
Chain Scission ◽  
Thermal Oxidative Degradation ◽  
Diffusion Controlled ◽  
Kinetics Of ◽  
Diffusion Controlled Reaction

Abstract The kinetics of thermal oxidative degradation of natural rubber (NR) have been studied by Wallace plasticity measurements. On the basis of the Kotliar's model of random chain scission, an expression was derived to interpret the kinetic data collected over a range of temperatures from 80 to 160°C. It has been shown that the kinetic parameter resulting from the present analysis, indeed refers to a diffusion-controlled reaction with an overall activation energy estimated to be 135 ± 6 kJ · mol−1. In addition, the implications of plasticity retention index, which measures the oxidizability of NR, are discussed.

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