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Morphology and mechanical properties of blends of polycarbonate and segmented copolyetherester
Author(s) -
Gaztelumendi M.,
Nazábal J.
Publication year - 2000
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.11176
Subject(s) - materials science , polycarbonate , amorphous solid , composite material , stress relaxation , glass transition , relaxation (psychology) , modulus , dynamic mechanical analysis , ductility (earth science) , young's modulus , elastic modulus , volume (thermodynamics) , polymer , thermodynamics , creep , organic chemistry , psychology , social psychology , chemistry , physics
The solid state features and the mechanical properties of melt mixed polycarbonate (PC)/segmented copolyetherester (CPEE) blends were investigated over the full composition range. The partially crystallized blends were composed of two amorphous phases but with only small composition differences in most blend compositions. The specific interactions, and the free volume decreases observed, gave rise to a decrease in the γ relaxation strength. The dependence on composition of both the decreases in the γ relaxation strength and in the free volume, as well as that of the modulus of elasticity and yield stress, were very similar to those of miscible blends. The nature of the amorphous phases of the blends at room temperature, changed from glassy to partially rubbery as the CPEE content was increased. As a consequence, to discuss the plots of the properties against composition at room temperature, the properties of the rubbery materials in the glassy state had to be determined. The synergistic modulus and yield stress behaviors appeared to be mainly determined by the γ relaxation strength and specific volume decrease, and that of ductility additionally by the T g change.