Heterogeneous nucleation in the crystallization of polyolefins: Part 1. Chemical and physical nature of nucleating agents

Nucleating agents for polyolefins are insoluble in the polymer melt and are probably always crystalline substances. The great majority of these agents expose a surface consisting of hydrocarbon groups resembling moderate to good solvents for the polymers, their insolubility being due to a layer-like...

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Bibliographic Details
Published in:Polymer (Guilford) 1970-05, Vol.11 (5), p.253-267
Main Author: Binsbergen, F.L.
Format: Article
Language:English
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Summary:Nucleating agents for polyolefins are insoluble in the polymer melt and are probably always crystalline substances. The great majority of these agents expose a surface consisting of hydrocarbon groups resembling moderate to good solvents for the polymers, their insolubility being due to a layer-like arrangement of their strongly polar parts. Increasing the solubility by changing the structure, by mixing, or by addition of other substances results in a reduced nucleating effect. Epitaxy is ruled out as a mechanism for the nucleating effect. The nucleating surfaces are rather low energy surfaces. Alignment of polymer molecules along the rows of hydrocarbon groups in the exposed surface is suggested as the cause of the effect.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(70)90036-4