Study on hot air aging and thermooxidative degradation of peroxide prevulcanized natural rubber latex film
| Autor: | Ningjian Ao, Mei Chen, Bei-Long Zhang, Weiyong Deng, Hui-Lun Liu |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Order of reaction Polymers and Plastics Analytical chemistry General Chemistry Activation energy Elastomer Peroxide Surfaces Coatings and Films chemistry.chemical_compound Hydrocarbon chemistry Natural rubber visual_art Materials Chemistry visual_art.visual_art_medium Composite material Fourier transform infrared spectroscopy Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Applied Polymer Science. 92:3196-3200 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.20313 |
| Popis: | The air-aging process at 120°C and the thermooxidative degradation of peroxide prevulcanized natural rubber latex (PPVL) film were studied with FTIR and thermal gravity (TG) and differential thermal gravity (DTG) analysis, respectively. The result of FTIR shows that the OH and COOH absorption of the rubber molecules at IR spectrum 3600–3200 cm−1, the CO absorption at 1708 cm−1, and the COH absorption of alcohol at 1105 and 1060 cm−1 increased continuously with extension of the aging time, but the CH3 absorption of saturated hydrocarbon at 2966 and 2868 cm−1, the CH3 absorption at 1447 and 1378 cm−1, and the CC absorption at 835 cm−1 decreased gradually. The result of TG-DTG shows that the thermal degradation reaction of PPVL film in air atmosphere is a two-stage reaction. The reaction order (n) of the first stage of thermooxidation reaction is 1.5; the activation energy of reaction (E) increases linearly with the increment of the heating rate, and the apparent activation energy (E0) is 191.6 kJ mol−1. The temperature at 5% weight loss (T0.05), the temperature at maximum rate of weight loss (Tp), and the temperature at final weight loss (Tf) in the first stage of degradation reaction move toward the high temperature side as the heating rate quickened. The weight loss rate increases significantly with increment of heating rate; the correlation between the weight loss rate (αp) of DTG peak and the heating rate is not obvious. The weight loss rate in the first stage (αf1) rises as the heating rate increases. The final weight loss rate in second stage (αf2) has no reference to heating rate; the weight loss rate of the rubber film is 99.9% at that time. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3196–3200, 2004 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text