Organosolv lignins as new stabilizers for cellulose nitrate: Thermal behavior and stability assessment
| Autor: | Abderrahmane Mezroua, Fouad Benaliouche, Ahmed Fouzi Tarchoun, Mohamed Fodil Cherif, Djalal Trache, Salim Chelouche |
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| Rok vydání: | 2020 |
| Předmět: |
Organosolv
02 engineering and technology Lignin Biochemistry 03 medical and health sciences chemistry.chemical_compound Structural Biology Spectroscopy Fourier Transform Infrared Cellulose Molecular Biology 030304 developmental biology Eucalyptus 0303 health sciences Molecular Structure Thermal decomposition Temperature Diphenylamine Collodion General Medicine 021001 nanoscience & nanotechnology Kinetics chemistry Chemical engineering Degradation (geology) 0210 nano-technology Nitrocellulose Stabilizer (chemistry) |
| Zdroj: | International Journal of Biological Macromolecules. 164:794-807 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2020.07.024 |
| Popis: | Cellulose nitrate, commonly known as nitrocellulose (NC), and its corresponding propellants naturally decompose at normal conditions. To avoid early degradation, unexpected explosion, energy loss, and ensure a safe storage, stabilizing agents are often introduced within its compositions. Conventional stabilizers, such as aromatic amines like diphenylamine (DPA) and urea, can produce carcinogenic/toxic substances during propellants shelf life. Thus, a need for alternative stabilizing agents, which offer similar/better effectiveness and display a non/low toxicity, remains a challenge. This paper investigates the stabilizing effect of two organosolv lignins (OL), obtained from Aleppo pine (AP) and Eucalyptus globulus (EG), on NC. For this purpose, conventional stability tests and kinetic modeling are applied for different samples (S1-S4) using 3% of stabilizer, which are S1, pure NC; S2, NC + DPA; S3, NC + OL(AP); and S4, NC + OL(EG). Beforehand, FTIR spectroscopy and DSC analysis have been used to check the compatibility of these potential stabilizers and NC. The obtained results via Bergmann-Jung and vacuum stability tests suggested that the prepared mixtures are stable. The kinetic study based on DSC data using isoconversional methods shows that both stabilizers display a good stabilizing effect. The reactivity between the different organosolv lignins and NOx released during the degradation of NC has been well highlighted using FTIR and TGA analyses. Hence, these efficient, environmentally friendly and readily available substances can be effectively used as stabilizers for NC-based formulations. |
| Databáze: | OpenAIRE |
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