Effect of Addition of Cross-Linked Starch on the Properties of Degraded PBAT Poly(butylene adipate-co-terephthalate) Films

This work aimed to evaluate the properties of butylene adipate-co-terephthalate (PBAT) degraded after 1800 days of storage (DPBAT) by preparing blends (films) with crosslinked starch (Cm) through extrusion and thermocompression. Different ratios of DPBAT:Cm (70:30, 60:40, and 50:50 m/m) were prepare...

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Bibliographic Details
Authors: Grimaut, Denise Agostina, Alves da Silva, Jania Betania, Lemos, Paulo Vitor França, Cruz Correia, Paulo Romano, Santos Santana, Jamille, Cavalcanti Pessôa, Luiggi, Estevez Areco, Santiago, Fama, Lucia Mercedes, Goyanes, Silvia Nair, Rodrigues Marcelino, Henrique, de Jesus Assis, Denilson, Oliveira de Souza, Carolina
Format: article
Status:Published version
Publication Date:2023
Country:Argentina
Institution:Consejo Nacional de Investigaciones Científicas y Técnicas
Repository:CONICET Digital (CONICET)
Language:English
OAI Identifier:oai:ri.conicet.gov.ar:11336/226116
Online Access:http://hdl.handle.net/11336/226116
Access Level:Open access
Keyword:BLENDS
CROSSLINKING
PLOY(BUTYLENE ADIPATE-CO-TEREPHTHALATE)
POTATO STARCH
https://purl.org/becyt/ford/2.9
https://purl.org/becyt/ford/2
Description
Summary:This work aimed to evaluate the properties of butylene adipate-co-terephthalate (PBAT) degraded after 1800 days of storage (DPBAT) by preparing blends (films) with crosslinked starch (Cm) through extrusion and thermocompression. Different ratios of DPBAT:Cm (70:30, 60:40, and 50:50 m/m) were prepared. The incorporation of Cm into DPBAT significantly changed the properties of the films by making them stiffer (increasing Young’s modulus by up to 50%) and increasing the thermal resistance of DPBAT. The presence of crosslinked starch in the films made them less hydrophobic (with decreased contact angle and increased moisture content), but these parameters did not vary linearly with changes in the content of crosslinked starch in the blend (DPBAT:Cm). The microscopic images show an inhomogeneous distribution of Cm granules in the DPBAT matrix. Thus, the films prepared with PBAT show a significant decrease in their mechanical parameters and heat resistance after long-term storage. However, the preparation of blends of degraded DPBAT with crosslinked starch promoted changes in the properties of the films prepared by thermocompression, which could be useful for disposable packaging.

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