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Melt Miscibility And Mechanical Properties Of Metallocene
Linear
Low-Density Polyethylene Blends With High-Density
Polyethylene:
Influence Of Comonomer Type
Hussein, IA
JOHN WILEY SONS LTD, POLYMER INTERNATIONAL; pp: 1330-1336; Vol: 54
King Fahd University of Petroleum & Minerals
http://www.kfupm.edu.sa
Summary
In this paper, the implications of melt miscibility on the thermal and mechanical
properties of linear low-density polyethylene (LLDPE)/high-density polyethylene
(HDPE) blends were assessed with respect to the influence of the comonomer type.
The influence of the latter was examined by selecting one butene LLDPE and one
octene LLDPE of very similar weight-average molecular weight (M-w), molecular-
weight distribution (MWD) and branch content, keeping the comonomer type as the
only primary molecular variable. Each of the two metallocene LLDPEs was melt-
blended with the same HDPE at 190 degrees C in a Haake melt-blender. The
rheological, thermal and mechanical properties were measured by the use of an ARES
rheometer, differential scanning calorimeter and Instron machine, respectively. The
rheological measurements, made over the linear viscoelastic range, suggested no
significant influence of the branch type on the melt miscibility. The rheology results
are in agreement with those obtained from previous transmission electron microscopy
(TEM) and small-angle neutron scattering (SANS) studies. The dynamic shear
viscosity and total crystallinity of the metallocene (m)-LLDPE blends with HDPE
followed linear additivity. At small strains, the branch type has little or no influence
on the melt miscibility and solid-state properties of the blends. Even the large-strain
mechanical properties, such as tensile strength and elongation at break, were not
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influenced by the comonomer type. However, the ultimate tensile properties of the
HDPE-rich blends were poor. Incompatibility of the HDPE-rich blends, as a result of
the weak interfaces between the blend components, is suggested to develop at large
strains. (c) 2005 Society of Chemical Industry.
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