2012
DOI: 10.1590/s0103-50532012000300008
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Characterization of thermoplastic starch/poly(lactic acid) blends obtained by extrusion and thermopressing

Abstract: Blendas de poli(ácido láctico)(PLA) e amido termoplástico (TPS) foram preparadas por extrusão e moldagem por compressão utilizando 0,1, 0,2 e 0,3 g de PLA per g de TPS. O TPS foi obtido por extrusão utilizando 0,25 e 0,30 g de glicerol por g de amido. Foram avaliadas as propriedades mecânicas e de barreira ao vapor de água, e determinadas as isotermas de sorção de umidade. A morfologia dos materiais foi avaliada através de microscopia eletrônica de varredura e as propriedades térmicas dos polímeros puros e das… Show more

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Cited by 29 publications
(38 citation statements)
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“…The C parameter, which is associated with the sorption heat of the monolayer, was higher for DEA sheets, and the magnitude of this parameter was in agreement with values reported in other studies of PLA/TPS blends [37].…”
Section: Moisture Sorption Isothermssupporting
confidence: 91%
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“…The C parameter, which is associated with the sorption heat of the monolayer, was higher for DEA sheets, and the magnitude of this parameter was in agreement with values reported in other studies of PLA/TPS blends [37].…”
Section: Moisture Sorption Isothermssupporting
confidence: 91%
“…The GAB model represented the experimental data (R 2 [ 0.99) well, and this model is adequate for describing the water sorption isotherms of the TPS films [27,31,36], and the TPS/PLA blends [37].…”
Section: Moisture Sorption Isothermsmentioning
confidence: 91%
“…Comparing the obtained results with other results reported in the literature, lower values of the tensile strength, Young's modulus and elongation at break were obtained in PLA/TPS (30 g PLA / 100 g TPS) films produced by extrusion and thermopressing [29,30] In this case, because TPS was the continuous phase, it was responsible for the mechanical properties of the films, resulting in more fragile materials. PLA/TPS films (20% TPS) with increased resistance were produced by Teixeira et al [34] due the addition of cassava bagasse.…”
Section: Mechanical Propertiessupporting
confidence: 71%
“…The values obtained are lower than those observed for cassava starch films [35,36] and PLA/TPS films [29] and greater than PLA films with synthetic phenolic antioxidants added [37] . The presence of PLA promoted a hydrophobic character of the material and was responsible for decreasing the WVP because the material permeability is strongly influenced by the hydrophobic or hydrophilic nature of its components.…”
Section: Water Vapor Permeability (Wvp)contrasting
confidence: 69%
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