The purpose of blending polymers is
to obtain materials with additional
properties and minimum sacrifice of
their original properties [1-2]. An
immiscible blended polymer system
usually has a microstructure with the
phase separation between components.
This system, therefore, is a
new polymeric material with the special
features of each polymer. In
immiscible polymer blends, the
major component forms a continuous
matrix while the dispersed one
assumes different forms (droplet,rod, fibril, or lamella) [3]. For improving strength and
stability of the interface in the immiscible polymer
blends, interface modifiers are added It has been reported that the melt spinning of immiscible
polymer blends into fibres with improved properties
is of great interest in synthetic fibres industry [5].
Immiscible polymers may provide unexpected, particularly
in the field of rheology . Brody [6] found that
small amounts of immiscible polymers can lower the
orientation of PET, nylon 66, and polypropylene fibres
at high speed wind-up. He believed that the mechanism
governing wind-up speed suppression takes place in the
spinning threadline connected deformation of globules
into microfibrils. The viscosity may be lower than pure
component over a broad concentration range, as had
been found by Han [7,8] for polystyrene/ polypropylene
and polystyrene/high density polyethylene blends.