Resumo

PAZ PENA, SANDRA PATRICIA; ALBAN BOLANOS, PEDRO  e  VILLADA CASTILLO, HÉCTOR SAMUEL. EFECT OF MASTERBARCH ADITIVE OVER A BIODEGRADABLE FILM FROM THERMOPLASTIC STARCH AND POLYLACTIC ACID. Rev.Bio.Agro [online]. 2016, vol.14, n.1, pp.110-118. ISSN 1692-3561.  https://doi.org/10.18684/BSAA(14)110-118.

Due to the current requirements in clean plastic materials, the project was conducted to study the effect of a masterbatch additive on mechanical properties (stress analysis), barrier (desiccant method), optical (CIELab and CIECh scale) of a polymer composed by cassava starch, polylactic acid (PLA) and grey masterbatch (MBG) and by using the blown film extrusion technology polymer. It was established that the films has a permeability to water vapor on the 90th day of monitoring (5,75E^-14 g/m*s*Pa), in the case of the oxygen permeability, the lower value occurred on day 30 (9,57503E¹⁹ mol/m*s*Pa), the water absorption and the solubility percentage decrease throughout changing to 97,9 % (day 8) a 86,3% (day 90) y 25,41% (day 8) a 19,61% (day 90), respectively. In relation whit the tensile modulus there wasn’t significant difference during the evaluation time, a decrease occurs in Young modulus (235,50 to 173,10 MPa) and the maximum elongation at break point (2,64 to 11,34 %). Regarding color, samples presented a luminosity value over 50, that is, neutrality in color; in the same manner in relation to Chroma (or saturation) (average value of 1,46) and a trend to neutral position on hue due to values close to 0. As supporting evidence was realized a Differential Scanning Calorimetry (DSC) test.

Palavras-chave : Pigment; Polymer; Water absorption; Colorimetry.

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