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Polímeros

versão impressa ISSN 0104-1428

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PASSADOR, Fabio R. et al. HDPE/LLDPE Blend-based nanocomposites - Part II: evaluation of thermal, optical and transport properties. Polímeros [online]. 2013, vol.23, n.6, pp.748-757. ISSN 0104-1428.  https://doi.org/10.4322/polimeros.2013.065.

High density polyethylene/ linear low density polyethylene (HDPE/LLDPE) blend-based nanocomposites were prepared in a twin-screw, using HDPE-g-MA as compatibilizer agent. The nanocomposites were characterized through thermal, optical and transport properties. The HDPE/LLDPE blend and the nanocomposites behave as a barrier to water vapor but are permeable to CO2 e O2. The addition of organoclay modified the crystallinity degree of the polymer matrix of the nanocomposites. The reduction of the permeability coefficient of the nanocomposites was correlated to the increase in the crystallinity of the polymer matrix and to the increase in diffusional path of the gas due to the increase in the tortuosity related to a good dispersion of the clay platelets in the matrix. These effects are related also to a good wettability of the filler by the polymeric matrix and strong interactions at the interface. Theorical permeability models proposed by Nielsen and Bharadwaj were used to estimate the aspect ratio of the organoclay in the nanocomposites with correlate well with the images observed through transmission electron microscopy.

Palavras-chave : Nanocomposites; HDPE/LLDPE; transport properties; Nielsen model; Bharadwaj model.

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