A.Sánchez-Solís*, A. Garcia-Rejon†, A.
Martínez-Richa‡,
F. Calderas, O. Manero.
Instituto de
Investigaciones en Materiales.UNAM
Apdo. Postal 70-360.
Del. Coyoacán. 04510. D.F., México.
† Industrial Materials Institute. National Research
Council of Canada.
75 de Mortagne J4B 6Y4.
Boucherville, Québec. Canada.
Deceased March 2002
‡Facultad de Química. Universidad de Guanajuato.
Noria Alta s/n. 36050
Guanajuato. México.
In this work, blends made of
polyethylene terephthalate (PET) and polyethylene 2,6 naphthalene dicarboxylate
(PEN) were prepared by melt extrusion processed at several temperatures and
residence times. The blends with composition up to 20 wt % PEN were
characterized with regard to their degree of transesterification and their
rheological properties. Subsequently, bottles were produced by
injection-stretch blow-molding and their mechanical properties were measured.
It was found that improved PET-PEN blends were produced at 270ºC with a PET
content of 15 and 20 wt % and residence time processing of 4 minutes. Both
blends present a low degree of transesterification, block conformations, high
shear viscosity and improved tensile properties.
Keywords: PET-PEN blends, rheology,
transesterification.
* Corresponding
author:
A. Sánchez-Solís
Instituto
de Investigaciones en Materiales. UNAM
Apdo.
Postal 70-360. Del. Coyoacán
04510. D.F., México.
E-mail: sancheza@servidor.unam.mx; Fax:
(52)-(55)-5616-1201.