Capacidad antioxidante de la lignina extraida del licor negro en polietileno de baja densida

espanolLa capacidad antioxidante de la lignina extraida del licor negro incorporada en polietileno de baja densidad (PEBD) fue estudiada a traves de la extrusion multiple del material, comparando los cambios en indice de carbonilo, indice de fluidez, masa molecular y propiedad de tension, con los obtenidos en PEBD formulado con aditivos comerciales (Irganox 1010 e Irganox 1076). Los resultados mostraron que a una concentracion de 800 ppm la lignina brinda una proteccion antioxidante al PEBD. Su efecto como agente antioxidante es similar en comparacion con el observado al emplear los aditivos comerciales estudiados. Tambien se observo que la lignina combinada con los aditivos comerciales estudiados brinda una proteccion antioxidante adecuada para procesar al PEBD, lo que resulta ventajoso debido a que este bioplimero es subproducto del desecho en la industria papelera. EnglishIt was studied the antioxidant capacity of the lignin extracted from the black liquor. Lignin was incorporated in low density polyethylene (LDPE) and their performance as antioxidant was studied through the multiple extrusion of the material, comparing the changes in carbonyl index, melt flow index, molecular mass and property of tension, with the obtained ones in LDPE formulated with commercial additives (Irganox 1010 and Irganox 1076). The results showed that to a lignin concentration of 800 ppm this biopolymer offers an antioxidant protection to the LDPE. Their effect like antioxidant is similar in comparison with the observed one when using the studied commercial additives. It was also observed that the lignin mixed with the studied commercial additives offers an antioxidant protection adapted to process the LDPE. This is an advantageous because lignin is a byproduct of the waste in the papermaking industries and it can be exploited in the formulation of additives for this type of polymer.