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The miscibility of the poly(vinyl acetate) and poly(
ethylene) blends hasbeen studied using the solvent casting
method.Fine solvents of benzene,toluene,acetone,methyl alcohol,
cycloheaxanone were used.The glass transition and melt-ing
temperature of the crystalline-amorphous blends were measured by
differentscanning calorimeter(DSC).It is shown that the blends
of various compositionsare miscible in their molten state. The
Flory-Huggins interaction parameterswere determined using the
melting depression analysis. These parameters arenegative for
the blends prepared from various casting solvents.Generally,
toluene and cycloheaxanone are better solvents where the blends
have a more homogeneous morphology. The Flory-Huggins
interaction parameters are alsoplotted against the boiling
temperatures of various casting solvents. A consis-tent
correlation shows that more negative values of interaction
parameters existbetween the boiling temperatures of 80 to 160℃
for blends of various composi-tions. This temperature range
correpond to the toluene and cycloheaxanone usedin this study.
It is indicated that the correlation is useful in selecting
theapprop[riate solvents in preparing polymer blends. Further
investigation onmore polymer blend and casting solvent systems
are essential to generalizethis correlation.
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