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The effect of viscosity ratio on the phase inversion of polyamide 66/polypropylene blends
Author(s) -
Hietaoja Pirjo T.,
HolstiMiettinen Riitta M.,
Seppälä Jukka V.,
Ikkala Olli T.
Publication year - 1994
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1994.070541104
Subject(s) - materials science , polyamide , polypropylene , phase inversion , polymer blend , composite material , maleic anhydride , rheology , extrusion , phase (matter) , ultimate tensile strength , particle size , polymer chemistry , polymer , chemical engineering , copolymer , chemistry , membrane , organic chemistry , biochemistry , engineering
The rheological properties of the blend components are an important parameter in the formation of a blend morphology. The effect of viscosity ratio on the morphology of polyamide 66/polypropylene blends was studied, with primary attention to the phase‐inversion behavior and the average particle size of the dispersed phase. The relationship between the mechanical properties and the phase‐inversion composition was investigated as well. Noncompatibilized and compatibilized blends having five different viscosity ratios were prepared by twin‐screw extrusion. Maleic anhydride‐grafted polypropylene was used as the compatibilizer to increase the adhesion between the two polymers and to stabilize the blend morphology. Investigation of the morphology of the blends by microscopy (SEM and TEM) showed that the smaller the viscosity ration (η PA /η PP ) the smaller was the polyamide 66 concentration at which the phase inversion took place and that polyamide 66 became the continuous phase. The results are in accord with the model of Jordhamo. The compatibilizer induced a sharp reduction of particle size, but did not have a major effect on the phaseinversion point. The tensile and impact properties of the compatibilized blends were found to correlate with the phase inversion. An improvement in the mechanical properties was observed when polyamide 66 provided the matrix phase. © 1994 John Wiley & Sons, Inc.