Influence of addition of organic fillers on the properties of mechanically recycled PLA



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Beltrán González, Freddys and Gaspar Roa, Gerald Manuel and Chomachayi, Masoud Dadras and Jalali Arani, Azam and Lozano Pérez, Antonio Abel and Cenis Anadón, José Luis and Orden Hernández, María Ulagares de la and Pérez Tabernero, Ernesto and Martínez Urreaga, Joaquín (2020) Influence of addition of organic fillers on the properties of mechanically recycled PLA. Environmental Science and Pollution Research . ISSN 0944-1344 (Print) 1614-7499 (Online)

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Poly(lactic acid) (PLA) is one of the most used biobased and biodegradable polymers. Due to their high stability, some of the newest grades of PLA are only degradable under severe industrial conditions. For these grades, mechanical recycling is a viable end-of-life option, with great environmental advantages. However, the polymer undergoes degradation during its service life and in the melt reprocessing, which leads to a decrease in properties that can compromise the recyclability of PLA. The goal of this work was to evaluate the usefulness of adding small amounts of two organic fillers, chitosan, and silk fibroin nanoparticles, during the recycling process for improving the properties of the recycled plastic. The degradation level of the aged polymer and the nature and amount of filler affect the performance of the recycled plastics. The fillers reduce the degradation during the melt reprocessing of PLA previously subjected to severe hydrolysis, thus increasing the intrinsic viscosity of the recycled plastic. A careful selection of the added organic filler lead to recycled plastics with improvements in some key mechanical, thermal, and barrier properties. Thus, the use of organic fillers represents a cost-effective and environmentally sound way for improving the mechanical recycling of bioplastics.

Item Type:Article
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Received: 30 October 2019; Accepted: 6 February 2020

Uncontrolled Keywords:Poly (lactic acid); MEchanical recycling; Silk fibroin nanoparticle; Chitosan; Gas barrier properties; Mechanical properties; Thermal properties
Subjects:Sciences > Chemistry > Plastics industry
Sciences > Chemistry > Chemistry, Organic
Sciences > Chemistry > Waste products
ID Code:59803
Deposited On:04 Apr 2020 18:04
Last Modified:10 Feb 2021 23:00

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