Titone Vincenzo, Mistretta Maria Chiara, Botta Luigi, La Mantia Francesco Paolo
Department of Engineering, University of Palermo, Viale delle Scienze, 90128 Palermo, Italy.
INSTM Consortium for Materials Science and Technology, Via Giusti 9, 50125 Firenze, Italy.
Polymers (Basel). 2022 Dec 8;14(24):5362. doi: 10.3390/polym14245362.
Decarbonization of plastics is based on two main pillars: bio-based polymers and recycling. Mechanical recycling of biodegradable polymers could improve the social, economic and environmental impact of the use of these materials. In this regard, the aim of this study was to investigate whether concentrations of the same recycled biopolymer could significantly affect the rheological and mechanical properties of biodegradable monopolymer blends. Monopolymer blends are blends made of the same polymers, virgin and recycled. A sample of commercially available biodegradable blend was reprocessed in a single-screw extruder until two extrusion cycles were completed. These samples were exposed to grinding and melt reprocessed with 75% and 90% of the same virgin polymer. The blends were characterized by tensile tests and rheological tests. The results obtained showed that while multiple extrusions affected the mechanical and rheological properties of the polymer, the concentration of the reprocessed material present in the blends only very slightly affected the properties of the virgin material. In addition, the experimentally observed trends were accurately predicted by the additive model adopted.
生物基聚合物和回收利用。可生物降解聚合物的机械回收利用可以改善这些材料使用所带来的社会、经济和环境影响。在这方面，本研究的目的是调查相同回收生物聚合物的浓度是否会显著影响可生物降解单聚物共混物的流变学和力学性能。单聚物共混物是由相同聚合物（原生和回收）制成的共混物。将一种市售可生物降解共混物样品在单螺杆挤出机中进行再加工，直至完成两个挤出循环。这些样品经过研磨，并与75%和90%的相同原生聚合物进行熔融再加工。通过拉伸试验和流变试验对共混物进行表征。所得结果表明，虽然多次挤出会影响聚合物的力学和流变性能，但共混物中再加工材料的浓度仅对原生材料的性能产生非常轻微的影响。此外，所采用的加和模型准确预测了实验观察到的趋势。
