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Materials Research

versão impressa ISSN 1516-1439versão On-line ISSN 1980-5373

Resumo

GRAEBIN, Ana Paula et al. Polyethylene-polyaniline Nanofiber Composites: Evaluation of Experimental Conditions of in situ Polymerization. Mat. Res. [online]. 2015, vol.18, suppl.2, pp.121-126.  Epub 23-Out-2015. ISSN 1980-5373.  http://dx.doi.org/10.1590/1516-1439.348914.

The difficult processability of polyaniline (PAni) can be overcome by preparing composites with high density polyethylene (HDPE), resulting in a conducting material with improved mechanical properties. PAni nanofibers were synthesized in this research using a rapid mixing method, while HDPE/PAni composites were prepared by in situ polymerization using Cp2ZrCl2/MAO as a catalyst system. Different experimental conditions for polymerization and an electrochemical study were performed. The findings confirmed that the addition of small amounts of Pani (up to 7%) and longer impregnation (120 min) with methylaluminoxane (MAO) before polymerization are important factors contributing to increased catalytic activity. Analysis by cyclic and differential pulse voltammetry indicates that MAO reacts with the PAni in the ethylene polymerization process, and forms active species in the presence of the catalyst. Changes in catalytic activity may be due to the kinetic consumption of the active species, which become less important in the presence of PAni.

Palavras-chave : polyaniline; polyethylene; cyclic voltammetry; composites.

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