Behavior in simulated soil of recycled expanded polystyrene/waste cotton composites

Abstract

Composites consisting of waste cotton yarn (CF) from the textile industry and postconsumer expanded polystyrene (EPS) was followed during 90 days of exposure in simulated soil. The mechanical properties, morphologies and chemical natures of the composites were determined before and after exposure in simulated soil. The composites were made using a single-screw extrusion, a twin-screw extrusion and injection molding. The composites showed an increase of the mechanical properties nearly 50% in relation to the recycled expanded polystyrene (rEPS). After exposure in simulated soil the composites presented losses of mechanical properties. Evidence of the oxidation of the samples was demonstrated by the increase in the values of the carbonyl index after 30 days of exposure in simulated soil. Changes in the color of the surface of the sample were observed after 90 days of exposure and are due to the fungi and bacteria colonization on the surface.

Gamma radiation effect on sisal / polyurethane composites without coupling agents

“…In both cases, the fracture aspect was the same observed for the dispersed fiber composite, with embrittlement of micro fibrils after irradiation and no presence of interfacial gaps between the fibers and the polymer matrix. The absence of fiber-matrix interfacial gaps was reported by other authors [32,33] only for fibers that were treated with coupling agents, witchy suggests that the chemical affinity between the materials investigated in this work is suitable even without the use of coupling agents.…”

Valorisation De Dechets Plastiques Et d'INDUSTRIE Du Bois en Composite Moule a Froid : Effet Des Parametres De Fabrication Sur Les Proprietes Mecaniques

“…Une forte augmentation est aussi notée au niveau du MOR qui passe de 0,25 MPa (pour une pression de 1 MPa) à 7,82 MPa (pour une pression de 7 MPa), soit une valeur multipliée par près de 30. (Ansari et al, 2017 ;Borsoi et al, 2014). Ceci démontre le pouvoir améliorant de la pression de compactage sur les propriétés mécaniques des composites moulés sous pression.…”

Estudo da influência do teor de fibras e de compatibilizante na obtenção de compósitos de polietileno de alta densidade pós-consumo (PEADpc) com fibras de bagaço de cana-de-açúcar (BCA)

“…Considerando a presença do compatibilizante, o compósito com maior teor de compatibilizante (5%) apresentou uma redução de apenas 10%. Uma possível explicação para esse fato é que os compósitos compatibilizados apresentam maior interação interfacial, devido às reações entre os grupos ácidos do anidrido maleico e dos grupos hidrofílicos, presentes na superfície da fibra (ARAÚJO et al, 2008;BORSOI et al, 2011;BORSOI et al, 2014).…”