Tailoring the morphology and antibacterial activity of PBAT and thermoplastic cassava starch blown films with phosphate derivatives

Wongphan, Phanwipa ; Nerín, Cristina (Universidad de Zaragoza) ; Harnkarnsujarit, Nathdanai

Resumen: Phosphate derivatives contain a high number of reactive groups that interact functionally with various polymers. Tetrasodium pyrophosphate (Na₄P₂O₇), sodium tripolyphosphate (Na₅P₃O₁₀), and sodium hexametaphosphate (Na₆(PO₃)₆) were incorporated into bioplastic polybutylene-adipate-terephthalate (PBAT) blended with thermoplastic cassava starch (TPS) in blown films. Their physicochemical, morphological, thermal, and antimicrobial properties were investigated. PBAT/TPS blended films were compounded via blown film extrusion to produce functional packaging. Infrared spectra indicated starch modification through the disruption of anhydroglucose monomer units, analyzed by ATR-FTIR, providing a more amorphous fraction and altering the properties of the films. PBAT/TPS films containing phosphate compounds exhibited non-homogeneous structures, with dispersed clumps within the film matrices that decreased tensile strength. The incorporation of phosphate compounds modified the storage modulus and relaxation temperature of PBAT/TPS films, influencing molecular mobility, decreasing heat transfer efficiency in seal strength, and enhancing stiffness due to starch disruption and interaction between the phosphate compound and the PBAT/TPS matrix. Wettability and permeability of PBAT/TPS films were modified by changes in polymer structure.

Idioma: Inglés

DOI: 10.1016/j.ijbiomac.2024.137906

Año: 2024

Publicado en: International journal of biological macromolecules 283 (2024), 137906
ISSN: 0141-8130

Tipo y forma: Article (Published version)

Área (Departamento): Área Química Analítica (Dpto. Química Analítica)