Structure‐property‐processing relationships of polypropylene‐polybutylene blends

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Abstract
In this paper we discuss PP‐PB blends in which both components are highly crystallizable. It was our intention to try to prepare homogeneous PP‐PB blends, assuming miscibility in the melt, by using the ultraquenching technique and to study the properties of the resulting blends following crystallization from the glass. Due to the possibility of preparing homogenous blends by ultraquenching, it should be interesting to compare the morphology, properties, and crystallization of the glass‐crystallized blends with the melt‐crystallized blends. We conclude that, in general, the above results suggest there is a considerable degree of compatibility, possibly even miscibility, of PP and PB in the melt, but that miscibility is difficult to obtain by ordinary melt mixing processes.