Degradation kinetics and lifetime prediction for polystyrene/nanocellulose nanocomposites
| Autor: | Roberta Motta Neves, Felipe Gustavo Ornaghi, Sandro Campos Amico, Ademir J. Zattera, Heitor Luiz Ornaghi |
|---|---|
| Přispěvatelé: | Universidade Caxias do Sul (UCS), Universidade Estadual Paulista (Unesp), Federal University of Rio Grande do Sul |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Materials science 02 engineering and technology Activation energy 01 natural sciences Nanocellulose Nanocomposites chemistry.chemical_compound Thermal stability Physical and Theoretical Chemistry Cellulose Polystyrene Nanocomposite Lifetime prediction 021001 nanoscience & nanotechnology Condensed Matter Physics 010406 physical chemistry 0104 chemical sciences Kinetics chemistry Chemical engineering Thermal behavior Degradation (geology) 0210 nano-technology |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| Popis: | Made available in DSpace on 2021-06-25T10:15:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01 Cellulose nanofibers (CNFs) and cellulose nanocrystals (CNCs) were incorporated into polystyrene (PS), and thermal stability and lifetime prediction of the nanocomposites were investigated for variable filler content (0.25, 0.50 and 1% w/w). Thermogravimetric analysis (TG) was carried out at four different heating rates (5, 10, 20 and 40 °C min−1) in a non-isothermal condition, and the degradation kinetics was studied based on Friedman and Flynn–Wall–Ozawa (FWO) methods. The same thermal degradation behavior was observed for all samples in the studied range of reinforcement content. For both reinforcements (CNFs and CNCs), Friedman and FWO results showed no dependence of the activation energy on conversion degree. A single-step degradation mechanism was observed for all samples (A → B degradation model), and the kinetic studies indicated an autocatalytic reaction model with a good fitting of the curves. Lifetime prediction based on kinetic analysis was successfully applied. Lastly, nanocellulose morphology influenced nanocomposite lifetime prediction, which became more stable over time, maintaining almost 100% of the mass for 10 years exposed at 30–120 °C. Postgraduate Program in Engineering of Processes and Technologies (PGEPROTEC) Universidade Caxias do Sul (UCS), Rua Francisco Getúlio Vargas, 1130 Fatigue and Aeronautical Material Research Group Department of Materials and Technology School of Engineering Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha, 333 Postgraduate Program in Mining Metallurgical and Materials Engineering (PPGE3M) Federal University of Rio Grande do Sul Fatigue and Aeronautical Material Research Group Department of Materials and Technology School of Engineering Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha, 333 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|