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Polímeros

versão impressa ISSN 0104-1428

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DELGADO TOBON, Arnoldo Emilio; APERADOR CHAPARRO, William Arnulfo  e  GOMEZ RIVERA, William. Improvement of properties of tension in WPC of LDPE: HIPS/ natural fiber through crosslinking with DCP. Polímeros [online]. 2014, vol.24, n.3, pp.291-299.  Epub 09-Maio-2014. ISSN 0104-1428.  https://doi.org/10.4322/polimeros.2014.026.

Straight Retamo Fiber (telinemonspessulana) was mixed in a polymer matrix formed by low density polyethylene (LDPE) and high impact polystyrene (HIPS) in a 70:30 ratio. The natural fiber was subjected to size reduction between 1700 and 850 µm; surface treatment mercerization was performed; the moisture content was 0.17%. The thermo gravimetric analysis (TGA) showed that the treated fiber has stability at 200.53 °C. The preparation of the compound was performed in an internal mixer with the samples being obtained by compression molding. The effect of crosslinking agent was evaluated: dicumyl peroxide (DCP) in compounds with various percentages of fiber: 0; 10; 25; 50 phr. The addition of DCP (1 phr) in the compounds significantly improved tensile properties compared to similar concentrations of fiber; however, this difference in property values progressively decreased when the amount of fiber approximated 50 phr. The increase in fiber concentration negatively affected the tensile properties, except for the modulus of elasticity and fluence resistance. The main cause is the low interfacial adhesion between the natural fiber and the polymer matrix, clearly evidenced in the SEM images.

Palavras-chave : TelineMonspessulana; wood plastic composite (WPC); low density polyethylene; high impact polystyrene; dicumyl peroxide.

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