INVESTIGADORES
FRONTINI patricia Maria
artículos
Título:
Mechanical and Fracture characterization of 50:50 HDPE/PET blends presenting different phase morphologies
Autor/es:
L. FASCE; R. SELTZER; P. FRONTINI; V. J. RODRIGUEZ PITA; E.B.A.V. PACHECO,; M.L. DIAS
Revista:
POLYMER ENGINEERING AND SCIENCE
Editorial:
JOHN WILEY & SONS INC
Referencias:
Año: 2005 p. 354 - 363
ISSN:
0032-3888
Resumen:
Uncompatibilized and compatibilized blends of poly(ethylene
terephthalate) (PET) and high-density polyethylene
(HDPE) (50:50 PET/HDPE) have been prepared and characterized.
A commercial grade of ethylene/methacrylic
acid copolymer was used as compatibilizing agent and
added to the blends in two different proportions, 1% and
7%. Compounded blends were processed following
three different procedures: compression molding, extrusion,
and extrusion followed by annealing. In every case,
there is evidence that suggests that HDPE constitutes
the matrix and PET is the dispersed phase. The PET
phase shape was related to the processing procedure of
the blends. PET adopted a globular morphology in the
compression molded samples but it took the form of
microfibers (microfibrillar-like reinforced composites) in
extruded samples, which were flattened during the postextrusion
annealing process. According to the results
obtained in tensile and fracture tests, extruded blends
having 7% of ethylene/methacrylic acid copolymer appeared
as the optimum combination of processing
method and compatibilizer content.