Abstract
Some experimental evidence has recently been reported supporting the view of a phase-segregated melt in high-density/low-density polyethylene blends. Dispersive interaction between components makes it reasonable for segregation to occur. A simple model is proposed that allows one qualitatively to understand compatability as a function of the degree of branching. A critical branch content, ϵ c, below which compatibility is assured for all compositions, is predicted. The model is based on thermodynamic mixing concepts of lattice theory, assuming an increasing presence of holes with branching, according to specific-volume changes derived from X-ray data.
Published Version
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