| Autor: |
de Lima, Daniele R., Lima, Aline P., Chaves, Erica G., Teixeira, Sylvia C. S., da Rocha, Elisson B. D., Vieira, Ítalo R. S., Furtado, Cristina R. G., Figueiredo, Marco A. G., de Sousa, Ana Maria F. |
| Předmět: |
|
| Zdroj: |
Polymer Bulletin; Feb2024, Vol. 81 Issue 4, p3209-3227, 19p |
| Abstrakt: |
In this study, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) with germanium crystals was used to characterize the acrylonitrile content (ACN) of nitrile rubber (NBR) filled with carbon black after undergoing thermal and chemical degradations. Five NBR/carbon black formulations with ACN contents ranging from 29.7 to 45.4% were prepared. The mechanical and chemical properties of the NBR compounds were determined before and after exposure at 120 °C for 7, 15, 30, 60, and 90 days in the following environments: thermo-oxidative and simulated production fluid Type A.1.ii specified in ISO 23936-2:2011. A linear model with an R-squared statistic of 99.6% and a correlation coefficient of 0.998 was generated using the ATR-FTIR data of the A2237/A967 ratio of unaged NBR compounds and the actual value of the acrylonitrile content of neat NBR elastomers determined by 13-carbon nuclear magnetic resonance spectroscopy. This model was used to estimate the acrylonitrile content of degraded NBR compounds. The times that caused severe degradation of NBR compounds in thermo-oxidative and simulated production fluid environments were 15–30 days and 30–90 days, respectively. The ACN contents of those aged NBR compounds were successfully estimated using ATR-FTIR experimental values applied to the linear fit model of unaged NBR/carbon black compounds. This made it possible to differentiate between compounds with high and low ACN content, despite the high level of degradation. Thus, the ATR-FTIR technique combined with statistical tools can be a useful tool to predict the service life of rubber products and other composite materials. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink