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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

ESCHER, Fernanda F. N.; SILVA, Luciana P.; GALLAND, Griselda B.  e  BENETTI, Adriana. Ethylene copolymers analysis by fractionation techniques. Polímeros [online]. 2000, vol.10, n.4, pp.202-208. ISSN 1678-5169.  http://dx.doi.org/10.1590/S0104-14282000000400007.

Samples of ethylene 1-butene copolymer, produced in laboratory by different processes using Ziegler-Natta catalysts, ethylene-1-hexene and metallocene catalysts, were fractionated according to molecular size by direct extraction by different solvents and at different temperatures. These samples were also fractionated by differences on crystallinity using a DSC calorimeter. The obtained fractions were characterized by 13C-NMR , FTIR, GPC and DSC. The polyethylene copolymers produced by Ziegler-Natta catalyst were found more heterogeneous when compared with the one produced by metallocene catalysts. The commercial resin produced by UCC process with Ziegler-Natta catalysts showed a more homogeneous incorporation of comonomer compared with the one obtained by the Spherilene process. The supported metallocene catalyst gave a more homogeneous product than the homogeneous metallocene one.

Palavras-chave : Ethylene copolymers; microstructure; fractionation; 13C-NMR ; DSC; SEC; FTIR.

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