Rheology and morphology of linear polyurethane and poly(methyl methacrylate) blends formed in situ |
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Authors: | V F Shumskii L F Kosyanchuk I P Getmanchuk O V Babich O I Antonenko |
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Institution: | 1.Institute of Macromolecular Chemistry,National Academy of Sciences of Ukraine,Kiev,Ukraine |
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Abstract: | The rheological properties and morphology of flow during the in situ formation of linear polyurethane and poly(methyl methacrylate)
blends of various compositions are studied. At a certain conversion of the components, the initial homogeneous blend undergoes
phase separation, as evidenced by the nonadditive dependence of the logarithm of viscosity on blend composition. For individual
components, the gel points correspond to appreciably different conversions. For components in blends of various compositions,
this difference is less pronounced and associated with the kinetic conditions of blend formation. The morphology of flow of
the reaction blend over the time (or conversion) between the onset of phase separation and gelation during flow with a high
shear rate is determined by the blend composition and the ratio between the viscosity of the dispersion phase and the matrix. |
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