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    Comprehensive study of cellulose nanocrystals acetylation effects on poly (butylene adipate-co-terephthalate) nanocomposite films obtained by solvent casting and heat pressing

    Year: 2022

    Journal: Ind. Crop. Prod., Volume 177, MAR

    Authors: Francisco, Ana B. F. de P.; Lorevice, Marcos, V; Claro, Pedro I. C.; Gouveia, Rubia F.

    Organizations: Brazilian National Council for Scientific and Technological Development (CNPq/Brazil) [118405/2018-7, 380312/2020-4, 301362/2020-3, 301356/2020-3]; Sao Paulo Research Foundation (FAPESP/Brazil) [2020/08651-4]

    Keywords: Nanofibers; Functionalization; Mechanical properties; Morphology; Thermal analysis; Crystallinity

    Interest in biodegradable polymers has been increasing exponentially due to the global environmental concerns about inappropriate disposal of plastic materials. Considering this issue, poly (butylene adipate-co-terephthalate) (PBAT) is a good candidate to be applied to films, since it presents desirable, promising processability and thermal-mechanical properties and lower water solubility compared with other biopolymers. However, PBAT exhibits inferior mechanical properties compared with polyolefins. To overcome this, acetylated cellulose nanocrystals (CNCs-Ac) were systematically investigated by incorporating different weight ratios to PBAT-based films produced via a solvent casting/heat pressing approach. This process combines a well dispersed hydrophobic filler with additional temperature and pressing, ensuring improvement in yield strength (30%) and Young's modulus (90%), as well as an outstanding benefit in flexibility (> 650%), compared with neat PBAT film. This work provided a novel route to prepare PBAT bionanocomposites, showing greater potential for biodegradable packaging, which can be an alternative to conventional polymers.
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