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Article

Bionanocomposite Blown Films: Insights on the Rheological and Mechanical Behavior

1
Dipartimento di Ingegneria, Università di Palermo, Viale Delle Scienze, 90128 Palermo, Italy
2
Consorzio Interuniversitario per la Scienza e Tecnologia dei Materiali, INSTM, Via Giusti 9, 50121 Firenze, Italy
3
Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Viale Teresa Michel 5, 15121 Alessandria, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Alina Sionkowska
Polymers 2021, 13(7), 1167; https://doi.org/10.3390/polym13071167
Received: 23 March 2021 / Revised: 29 March 2021 / Accepted: 2 April 2021 / Published: 5 April 2021
In this work, bionanocomposites based on two different types of biopolymers belonging to the MaterBi® family and containing two kinds of modified nanoclays were compounded in a twin-screw extruder and then subjected to a film blowing process, aiming at obtaining sustainable films potentially suitable for packaging applications. The preliminary characterization of the extruded bionanocomposites allowed establishing some correlations between the obtained morphology and the material rheological and mechanical behavior. More specifically, the morphological analysis showed that, regardless of the type of biopolymeric matrix, a homogeneous nanofiller dispersion was achieved; furthermore, the established biopolymer/nanofiller interactions caused a restrain of the dynamics of the biopolymer chains, thus inducing a significant modification of the material rheological response, which involves the appearance of an apparent yield stress and the amplification of the elastic feature of the viscoelastic behavior. Besides, the rheological characterization under non-isothermal elongational flow revealed a marginal effect of the embedded nanofillers on the biopolymers behavior, thus indicating their suitability for film blowing processing. Additionally, the processing behavior of the bionanocomposites was evaluated and compared to that of similar systems based on a low-density polyethylene matrix: this way, it was possible to identify the most suitable materials for film blowing operations. Finally, the assessment of the mechanical properties of the produced blown films documented the potential exploitation of the selected materials for packaging applications, also at an industrial level. View Full-Text
Keywords: biopolymers; bionanocomposites; nanoclays; rheological behavior; mechanical properties; film blowing process biopolymers; bionanocomposites; nanoclays; rheological behavior; mechanical properties; film blowing process
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MDPI and ACS Style

Mistretta, M.C.; Botta, L.; Arrigo, R.; Leto, F.; Malucelli, G.; La Mantia, F.P. Bionanocomposite Blown Films: Insights on the Rheological and Mechanical Behavior. Polymers 2021, 13, 1167. https://doi.org/10.3390/polym13071167

AMA Style

Mistretta MC, Botta L, Arrigo R, Leto F, Malucelli G, La Mantia FP. Bionanocomposite Blown Films: Insights on the Rheological and Mechanical Behavior. Polymers. 2021; 13(7):1167. https://doi.org/10.3390/polym13071167

Chicago/Turabian Style

Mistretta, Maria C.; Botta, Luigi; Arrigo, Rossella; Leto, Francesco; Malucelli, Giulio; La Mantia, Francesco P. 2021. "Bionanocomposite Blown Films: Insights on the Rheological and Mechanical Behavior" Polymers 13, no. 7: 1167. https://doi.org/10.3390/polym13071167

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