Polímeros: Ciência e Tecnologia
https://revistapolimeros.org.br/article/doi/10.1590/0104-1428.05117
Polímeros: Ciência e Tecnologia
Original Article

Sericin as compatibilizer in starch/ polyester blown films

Garcia, Patrícia Salomão; Turbiani, Franciele Rezende Barbosa; Baron, Alessandra Machado; Brizola, Guilherme Luiz; Tavares, Mariane Alves; Yamashita, Fabio; Eiras, Daniel; Grossmann, Maria Victória Eiras

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Abstract

Abstract: This study investigated the effects of low concentrations of sericin (≤ 1.5 wt%) in starch- poly(butylene-adipate-co-terephthalate) (PBAT) films. The films were produced by blown extrusion and mechanical, barrier and structural properties were determined. Films containing 1.0 and 1.5 wt% sericin showed higher tensile strength (6.41 and 6.59 MPa) and Young's modulus (90.88 and 132.71 MPa) compared with film without sericin (4.76 MPa and 18.64 MPa). When 0.5 wt% of sericin was used, the elongation was reduced by 62%. The addition of sericin in a concentration of 1.5% (w/w) decreased the water vapor permeability of films from 7.55 to 5.94 g (m s Pa)-1, likely due to the formation of a more homogeneous and compact matrix. Based on these results, a mechanism of action is proposed, whereby sericin acts at the interface of the polymers (starch and PBAT), reducing the interfacial tension and enhancing compatibility.

Keywords

biodegradable packaging; compatibilization; extrusion; poly(butylene- adipate-co-terephthalate)

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