Poly(lactic acid) biocomposites containing biochar particles: effects of fillers and plasticizers on crystallization and thermal properties
| Autor: | Tom Haeldermans, Ann Cuypers, Dries Vandamme, Ruth Cardinaels, Pieter Samyn, Kenny Vanreppelen, Sonja Schreurs |
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| Přispěvatelé: | Schreurs, Sonja, Vanreppelen, Kenny, Cuypers, Ann, Processing and Performance, ICMS Affiliated |
| Rok vydání: | 2021 |
| Předmět: |
Thermogravimetric analysis
Materials science Thermal properties Polymers and Plastics General Chemical Engineering lcsh:Chemical technology Polylactic acid law.invention chemistry.chemical_compound Differential scanning calorimetry law Biochar lcsh:TA401-492 Materials Chemistry lcsh:TP1-1185 Char Physical and Theoretical Chemistry Crystallization Composite material Thermoplastic starch Polymer composites Organic Chemistry Plasticizer chemistry lcsh:Materials of engineering and construction. Mechanics of materials Glass transition |
| Zdroj: | Express Polymer Letters, 15(4), 343-360. BME-PT and GTE eXPRESS Polymer Letters, Vol 15, Iss 4, Pp 343-360 (2021) |
| ISSN: | 1788-618X |
| Popis: | Biochar has emerged as a filler material for bio-degradable composites with favorable thermal and mechanical properties. Therefore, biochar is used in poly (lactic acid) (PLA) and PLA/thermoplastic starch (TPS) based composites. The crystallization and thermo-analytical properties of these blends with increasing amounts (20 to 50 wt. %) of biochar are investigated. In thermogravimetric analysis, the PLA/char composites’ onset degradation temperature and temperature of maximum weight loss decrease with increasing biochar concentrations (320 °C to 275 °C and 380 °C to 350 °C respectively). Contrastingly, in the PLA/TPS/char composites, the impact of the biochar is shielded by the TPS. The unaltered glass transition demonstrates that biochar does not act as a plasticizer in any of the composites, while TPS does. Biochar acts as a nucleation agent, but hinders further crystal growth at high concentrations, as confirmed by isothermal crystallization and infrared spectroscopy. The TPS smoothens the PLA/biochar interface, leading to an obstructed nucleation effect of biochar, proven by differential scanning calorimetry, infrared spectroscopy and scanning electron microscopy. This work demonstrates the shielding effect TPS has on biochar and can help to further understand and optimize the production and biodegradability of these composites. This work was supported by Vlaams Agentschap Innoveren en Ondernemen (VLAIO) and European Institute of Innovation and Technology (EIT) [BM20160604]. |
| Databáze: | OpenAIRE |
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