Polymer Blends Handbook, Volume 1 and Volume 2 by L. A. Utracki

By L. A. Utracki

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Additional resources for Polymer Blends Handbook, Volume 1 and Volume 2

Example text

Since there is no deformation within the plug volume, the molecular theories of elasticity and the relations they provide to correlate, for example either the entrance pressure drop or the extrudate swell, are not applicable. The concentration dependence of the constant-stress viscosity, provides information on the inherent flow mechanism. The experimental data should be evaluated considering the log-additivity rule, lnηb = ∑φilnηi. There are five possible types of behavior, described as: 1. positively deviating blend (PDB), 2.

As a result, the blend quality and run-to-run reproducibility are improved. , 1995]. 6 Blends’ Performance The quality of compounded blend affects the processing and performance. Layering, poor weld lines in injection molded parts, skin-core extrudate structure with low notched Izod impact strength, all indicate poor blend quality — either not adequate dispersion or poor stabilization morphology. Compounding demands precise control of process variables. At the present most alloys are prepared by reactive processing.

There are several reports indicating that addition of a block or graft copolymer reduces ν and alters the molecular structure at the interface, but it rarely increases the interphase thickness. Another disadvantage of the addition method is the tendency for a copolymer to migrate to at least five different locations, forming saturated solutions and micelles in both phases, as well as the interphasial layer (block copolymers may also form mesophases). Hence, the copolymeric compatibilizer that is to be added to a blend should have: (i) maximum miscibility with the respective polymeric components, (ii) molecular weight of each block only slightly higher than the entanglement Me, and (iii) concentration just above CMC.

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