Sericin as compatibilizer in starch/ polyester blown films
AUTOR(ES)
Garcia, Patrícia Salomão, Turbiani, Franciele Rezende Barbosa, Baron, Alessandra Machado, Brizola, Guilherme Luiz, Tavares, Mariane Alves, Yamashita, Fabio, Eiras, Daniel, Grossmann, Maria Victória Eiras
FONTE
Polímeros
DATA DE PUBLICAÇÃO
29/11/2018
RESUMO
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.
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