Abstract
Polypropylene is frequently modified by incorporating ethylene during polymerization or by blending with ethylene polymers or copolymers. Such ethylene-containing systems exhibit a very characteristic texture of small particles (globules) superposed on the spherulitic crystallinity of the polypropylene. The nature and occurrence of these particles have been investigated. The conclusion reached is that they contain ethylene polymers, both crystalline and amorphous, and that they can exist in a quiescent melt.
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