Poly(lactic acid) bio-composites containing biochar particles: Effects of fillers and?plasticizer?on crystallization and thermal properties

编号 020028803

推送时间 20210426

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Poly(lactic acid) bio-composites containing biochar particles: Effects of fillers and?plasticizer?on crystallization and thermal properties

来源期刊 Polymers

期 第288期

发表时间 20200412

关键词 polymer composites;  thermal properties;  biochar;  polylactic acid;  thermoplastic starch; 

摘要 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 the thermogravimetric analysis, the PLA/char composites' onset degradation temperature and temperature of maximum weight loss decrease with increasing biochar concentrations (320 to 275 degrees C and 380 to 350 degrees 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 understand further and optimize the production and biodegradability of these composites.

服务人员 尚玮姣

服务院士 宋湛谦

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