Mechanism of formation of shish kebab structures

Autor:	Toshio Nagasawa, Yasushi Shimomura
Rok vydání:	1974
Předmět:	Materials science Whiskers General Engineering law.invention Crystal Linear low-density polyethylene Stress (mechanics) Crystallography law Shish kebab Shear stress Crystallization Composite material Dislocation
Zdroj:	Journal of Polymer Science: Polymer Physics Edition. 12:2291-2308
ISSN:	1542-9385 0098-1273
DOI:	10.1002/pol.1974.180121108
Popis:	To describe the characteristic crystalline structure of polyolefins, Pennings first proposed a model consisting of a combination of an extended chain crystal (a “shish”) and folded chain crystals (“kebabs”). In Pennings' model the “shish” forms first during a crystallization process under stress and then later the “kebabs” overgrow this “shish” structure epitaxially. Because we had some doubts about such a mechanism, we undertook a series of experimental studies on linear polyethylene, particularly in regard to the crystallization process from a solution under shear. Our conclusion is that the crystals grow first by a screw dislocation mechanism, like whiskers, and then later these are deformed by the shear stress to form the shish kebab structures.
Databáze:	OpenAIRE
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