temperature at which the mechanical tests were run. This 50/50
composition corresponds to the domain where a phase inversion
occurs. The permeability to water vapor gave an S-shape curve that
is typical of a “mixture” of immiscible polymers. The diffusion of
the water molecules is controlled by the continuous phase. To
compatibilize the two homopolymers, a 94/6 copolymer of PP and of
polyacrylic acid was added, at various levels, to a 60/40
mixture
of PET and PP: This did not affect markedly the elastic modulus.
The yield stress increased, however, indicating that we had a
better adhesion and that the copolymer seems to have a certain
emulsifier effect, increasing the quality of the dispersion
![](http://up.ba-everything.ir/view/1139824/download.png)
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