INVESTIGADORES
VILLAR Marcelo Armando
artículos
Título:
Novel synthesis of poly(ethylene)-poly(dimethylsiloxane) copolymers (PE-PDMS) using a metallocene catalyst
Autor/es:
A. CIOLINO; G. BARRERA GALLAND; M.L. FERREIRA; M.A. VILLAR
Revista:
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
Editorial:
Wiley Periodicals Inc.
Referencias:
Lugar: New York; Año: 2004 vol. 42 p. 2462 - 2473
ISSN:
0887-624X
Resumen:
Poly(ethylene)-poly(dimethylsiloxane) copolymers were synthesized in solution from ethylene monomer and omega-vinyl poly(dimethylsiloxane) macromonomer (PDMS) at 363 and 383 K using EtInd2ZrCl2/MAO as catalyst. The copolymers obtained were characterized by Fourier Transform infrared spectroscopy, 1H- and 13C-NMR, size-exclusion chromatography and differential scanning calorimetry. The rheological properties of the molten polymers were determined under dynamic shear flow tests at small amplitude oscillations, whereas the physical arrangement of the phase domains was analyzed using scanning electron microscopy (SEM)/ energy dispersive X-ray (EDX). The analysis of catalyst activity and the resulting polymers support the idea of PDMS blocks or chains grafted to polyethylene. The changes in the rheological behavior and the changes in the Fourier transform infrared and NMR spectra were in agreement with this proposal.
