Resumen

ARARAT, Carlos A.  y  MURILLO, Edwin A.. Functionalized Low Density Polyethylene with Maleinized Hyperbranched Polyester Polyol. ing.cienc. [online]. 2016, vol.12, n.23, pp.127-144. ISSN 1794-9165.  https://doi.org/10.17230/ingciencia.12.23.7.

Abstract In this work, low density polyethylene (LDPE) was modified in the melt state with a maleinized hyperbranched polyester polyol (HBPAM), using several proportions of dicumyl peroxide (0.5, 1.0, 1.5 and 2.0 %). Infrared analysis showed the signals of OH, C=O, -COOR and -C=C- groups of the HBPAM in the spectra of the functionalized samples (LDPE-g-HBPAM). Grafting degree (GD) was between 9.14 and 9.82 %. Melt flow index of the samples LDPE-g-HBPAM was lower than that of the LDPE, and it did not exhibit dependency on the dicumyl peroxide content and GI. Except for the sample obtained with a 2.0 % of dicumyl peroxide, all melting temperatures of the samples of LDPE-g-HBPAM were similar to that of the LDPE. The melting enthalpy of the samples LDPE-g-HBPAM decreased with the concentration of dicumyl peroxide and GD. The tensile modulus of these samples was higher than that of LDPE, but the elongation at break was lower

Palabras clave : low density polyethylene; hyperbranched polyester; functionalization; thermal analysis; mechanical properties.

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