Properties of Biodegradable Films Based on Poly(butylene Succinate) (PBS) and Poly(butylene Adipate-co-Terephthalate) (PBAT) Blends

Properties of Biodegradable Films Based on Poly(butylene Succinate) (PBS) and Poly(butylene Adipate-co-Terephthalate) (PBAT) Blends

Compression molded biodegradable films based on poly(butylene succinate) (PBS) and poly(butylene adipate-co-terephthalate) (PBAT) at varying weights were prepared, and their relevant properties for packaging applications are here reported. The melt rheology of the blends was first studied, and the b...

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Published in:Polymers Vol. 12; no. 10; p. 2317
Main Authors: de Matos Costa, Anna Raffaela, Crocitti, Andrea, Hecker de Carvalho, Laura, Carroccio, Sabrina Carola, Cerruti, Pierfrancesco, Santagata, Gabriella
Format: Journal Article
Language:English
Published: Basel MDPI AG 10-10-2020
MDPI
Subjects:
Biodegradability
Cooling
Crystallization
Ductility
Elastic deformation
Elongation
Fourier transforms
Infrared spectroscopy
Mechanical properties
Mixtures
Modulus of elasticity
Morphology
Packaging
Permeability
Polymer blends
Polymer films
Polymer melts
Polyolefins
Rheological properties
Rheology
Scanning electron microscopy
Shear thinning (liquids)
Spectrum analysis
Stiffness
Tensile strength
Tensile tests
Terephthalate
Viscoelasticity
Water vapor
United States > US
Italy
Germany
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Summary:Compression molded biodegradable films based on poly(butylene succinate) (PBS) and poly(butylene adipate-co-terephthalate) (PBAT) at varying weights were prepared, and their relevant properties for packaging applications are here reported. The melt rheology of the blends was first studied, and the binary PBS/PBAT blends exhibited marked shear thinning and complex thermoreological behavior, due to the formation of a co-continuous morphology in the 50 wt% blend. The films were characterized by infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), mechanical tensile tests, scanning electron microscopy (SEM), and oxygen and water vapor permeability. PBS crystallization was inhibited in the blends with higher contents of PBAT, and FTIR and SEM analysis suggested that limited interactions occur between the two polymer phases. The films showed increasing stiffness as the PBS percentage increased; further, a sharp decrease in elongation at break was noticed for the films containing percentages of PBS greater than 25 wt%. Gas permeability decreased with increasing PBS content, indicating that the barrier properties of PBS can be tuned by blending with PBAT. The results obtained point out that the blend containing 25 wt% PBS is a good compromise between elastic modulus (135 MPa) and deformation at break (390%) values. Overall, PBS/PBAT blends represent an alternative for packaging films, as they combine biodegradability, good barrier properties and reasonable mechanical behavior.
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This paper is an extended version of paper presented in the 9th International Conference on “Times of Polymers and Composites”: From Aerospace to Nanotechnology, Ischia, Italy, 17–21 June 2018 (AIP Conf. Proc. 2018, 1981, 020180, doi:10.1063/1.5046042).
This paper is dedicated to the memory of Prof. Eduardo Luís Canedo and Maria Rossella Nobile.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym12102317