Thermooxidative degradation and its kinetics of natural rubber coagulated by microwave radiation
-
Lu-Sheng Liao
,
Yi-Min Li
Abstract
The thermooxidative degradation of natural rubber (NR) coagulated by microwave radiation (NR-m) was investigated by thermogravimetry (TG) analysis, and compared with NR coagulated by acid (NR-a). It was found that the degradation process is not a one-step reaction, the main degradation process occurs at 300–400ºC, and the equilibrium degradation temperatures of NR-m are higher than those of NR-a. Different methods were used to find the most probable kinetic model and the Arrhenius parameters (activation energy E and preexponential factor A) for the main stage of thermooxidative degradation of NR-m. The results show that the values of E and A, obtained from the Coats-Redfern method, are highly variable with the kinetic model chosen and the heating rate (β), and the apparent activation energy (E0) when β approaches zero for the Dn type kinetic model is in the range of 96.7–106.4 kJ ∙ mol-1. The mean values of E, calculated by the Friedman and Flynn-Wall-Ozawa (FWO) methods, are 113.8 and 83.3 kJ ∙ mol-1, respectively, suggesting E in the range of 83.3–113.8 kJ ∙ mol-1. Comparison of these two ranges indicates the most probable kinetic model to be Dn type kinetic models, corresponding to a diffusion-controlled mechanism.
©2012 by Walter de Gruyter Berlin Boston
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Articles in the same Issue
- Masthead
- Masthead
- Original Articles
- Sensitivity analysis of free-volume theory parameters in multicomponent polymer-solvent-solvent systems
- Effect of intercalant types on the properties of melt blended metallocene polyethylene/metallocene polyethylene-g-silane/clay nanocomposites
- Compatibilization and toughening of immiscible ternary blends of polyamide 1010, polypropylene, and ABS resin
- Clay modification with silane compounds and characterization of the silicone rubber/clay composites
- Effects of surface treatments of AA 2024-T3 aluminum sheet on bonding to epoxy-based film adhesive
- Thermooxidative degradation and its kinetics of natural rubber coagulated by microwave radiation
- Modeling of tensile modulus of polyolefin-layered silicate nanocomposites: modified micro-mechanical and statistical methods
- Comparative study and characterization of starches isolated from unconventional tuber sources
- Unsaturated polyester/E-glass fiber composites made by vacuum assisted compression resin transfer molding
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