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Effects of mineral additives on the β-crystalline form of isotactic polypropylene

✍ Scribed by Jiachun Feng; Mingcai Chen; Zhitang Huang; Yuanqiang Guo; Hongqi Hu

Publisher
John Wiley and Sons
Year
2002
Tongue
English
Weight
93 KB
Volume
85
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

Nineteen kinds of minerals, alone and in bicomponent mixtures with LaC (a mixed ternary complex of trivalent lanthanum stearate and stearin), were added to isotactic polypropylene (iPP). The influences of the minerals on the crystallographic forms of iPP were investigated. A wide‐angle X‐ray diffraction examination demonstrated that no mineral or LaC acting alone could induce the occurrence of the hexagonal β‐form, whereas the bicomponent mixtures could when the mineral was a calcium compound or contained calcium compounds, whether the calcium compounds had a hexagonal crystallographic form or not. We surmise that the actual β‐iPP substrate in such a system might be some binuclear complexes of calcium and rare earth elements with some specific ligands. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 1742–1748, 2002

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